JP5859288B2 - Method for repairing plate member, plate member, combustor, split ring, and gas turbine - Google Patents

Description

  The present invention relates to a plate member repair method, a plate member, a combustor including the plate member, a split ring, and a gas turbine.

  The combustor of the gas turbine includes a tail tube that sends high-temperature and high-pressure combustion gas to the turbine. The body plate forming the tail tube has a structure for guiding cooling air to the inside in order to prevent burning due to exposure to high-temperature combustion gas. Specifically, a plurality of cooling air passages extending in a direction along the axis of the transition piece are formed in the body plate, and a cooling air inlet opening to the outer peripheral side of the body plate for each of the plurality of cooling air passages. And a cooling air outlet opening on the inner peripheral side of the body plate. The cooling air enters the cooling air passage from the cooling air inlet on the outer peripheral side of the transition piece and exits from the cooling air outlet to the inner peripheral side of the transition piece.

  The tail tube of the combustor of the gas turbine having the above structure may cause linear cracks due to thermal cycle fatigue during operation. As such a crack repair method, a repair method as described in Patent Document 1 is known. That is, in this repair method, after performing a groove forming process of removing a crack occurrence portion and providing a groove for welding and a embedding process of embedding the bottom of the groove by welding, an opening of the groove is performed. A lid attaching step for attaching a lid plate to the part is performed.

JP 2002-361523 A

  However, in the above repair method, it is necessary to create a cover plate having an appropriate shape for each repair according to the shape of the crack to be repaired, and it is necessary to make the groove dimensions correspond to the cover plate. The operation for forming the groove becomes complicated. For this reason, the repair work takes a long time, and not only the delivery time cannot be shortened, but also the repair cost increases.

  The present invention has been made in consideration of such circumstances, and its purpose is to repair a plate-like member that can be carried out in a short time and at a low cost while ensuring the cooling performance of the cooling air passage. Is to provide.

In order to achieve the above object, the present invention provides the following means.
That is, the plate member repairing method of the present invention is a plate member repairing method in which a high pressure space and a low pressure space are separated from each other, and a cooling passage is provided inside along the plate surface. Removing the damaged portion of the plate-like member and exposing the cooling passage, and closing the exposed cooling passage and filling the region where the material is removed by the removing processing step, and exposing the exposed cooling passage. An additional processing step for forming an outer shape that is closed and has no defect when viewed from the original outer shape; A first opening forming step of providing a first opening to be communicated with the cooling passage, and communicating the cooling passage with the high-pressure space on the downstream side of the position where the cooling passage is closed when viewed from the refrigerant flow direction of the cooling passage. Characterized in that it comprises a and a second opening forming step of forming the second opening.

  According to the above configuration, the damaged portion can be repaired by an easy method, and the working fluid can be circulated upstream and downstream of the damaged portion of the cooling passage. As a result, the cooling passage is not blocked by repairing the damaged portion, and various functions such as cooling can be prevented from being lowered. Furthermore, it is not necessary to create a cover plate according to the shape of the crack to be repaired or to form a groove corresponding to the cover plate. Therefore, it is possible to repair the plate-like member in a short time and at a low cost while ensuring the cooling performance of the cooling passage.

  In the plate member repairing method, in the first opening forming step, the first opening is formed by forming a through-hole penetrating from the surface on the high pressure space side to the surface on the low pressure space side of the plate member. It is preferable to include a second additional processing step in which an opening is provided to fill and close a portion where the high-pressure space in the through hole communicates with the cooling passage.

  According to the said structure, even when the access direction of the tool for forming an opening is limited only from the high voltage | pressure chamber side, the repair method of this invention can be utilized.

  The plate-shaped member repairing method may further include a scoring step in which a scoring is provided at a position where the first opening and the second opening are provided between the removal processing step and the additional processing step. It is preferable.

  According to the said structure, a 1st opening formation process and a 2nd opening formation process can be implemented easily and reliably by specifying the location which provides an opening by referring the position of the cooling passage exposed previously. .

The plate-like member of the present invention is a plate-like member that is disposed so as to separate the high-pressure space and the low-pressure space, and has a cooling passage provided along the plate surface . An oblong hole communicating at least one of the cooling passage, a filling member provided to fill the oblong hole, and an opening provided on the low-pressure space side of the plate-like member, the cooling passage A first opening for communicating the cooling passage with the low-pressure space on the upstream side of the filling member as viewed from the flow direction of the refrigerant flowing through the opening, and an opening provided on the high-pressure space side of the plate-like member, And a second opening that communicates the cooling passage with the high-pressure space on the downstream side of the filling member as viewed from the flow direction of the refrigerant flowing through the cooling passage.

  Further, in the plate-like member, a through hole penetrating from the low pressure space to the high pressure space at a position corresponding to the first opening is closed on the high pressure space side from a position where the through hole and the cooling passage intersect. It is good also as a structure which has the obstruction | occlusion member to perform.

  Moreover, this invention provides the combustor of the gas turbine provided with the said plate-shaped member.

The combustor includes the plate-shaped member formed in a cylindrical shape, and the plate-shaped member includes an outer shell plate having a groove formed on a surface facing the low-pressure space side, and a low pressure of the outer shell plate. An inner shell plate joined to a surface facing the space, wherein the high pressure space is a space inside the casing of the gas turbine and outside the combustor, and the low pressure space is inside the combustor. A configuration that is a space is preferable.

Moreover, this invention provides the split ring of the gas turbine provided with the said plate-shaped member.
Furthermore, the present invention provides a gas turbine including at least one of the combustor and the split ring.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to repair a damaged site | part by an easy method, a working fluid can be distribute | circulated to the upstream and downstream with respect to the damaged site | part of a cooling channel, respectively. As a result, the cooling passage is not blocked by repairing the damaged part, and the cooling function can be prevented from being lowered. Furthermore, it is not necessary to create a cover plate according to the shape of the crack to be repaired or to form a groove corresponding to the cover plate. Therefore, it is possible to repair the plate-like member in a short time and at a low cost while ensuring the cooling performance of the cooling passage.

It is the whole side view which notched the principal part of the gas turbine which concerns on embodiment of this invention. It is the A section enlarged view of FIG. It is a principal part notch perspective view of the transition piece which concerns on embodiment of this invention. It is a flowchart of the repair method which concerns on embodiment of this invention. It is a figure which shows the trunk | drum of a tail cylinder, Comprising: (a) The top view seen from the compartment side of the trunk | drum, (b) It is DD sectional drawing. It is a figure explaining the removal process process of the repair method of a trunk plate, Comprising: (a) The top view seen from the compartment side of the trunk plate, (b) It is DD sectional drawing. It is a figure explaining the ruled line process of the repair method of a trunk plate, (a) The top view seen from the compartment side of the trunk plate, (b) It is DD sectional drawing. It is a figure explaining the 1st additional processing process of the repair method of a trunk plate, Comprising: (a) The top view seen from the compartment side of the trunk plate, (b) It is DD sectional drawing. It is a figure explaining the 1st opening formation process and the 2nd opening formation process of a repair method of a body board, and (a) A top view seen from the cabin side of a body board, (b) DD sectional view. . It is a figure explaining the 2nd additional machining process of the repair method of a trunk plate, Comprising: (a) The top view seen from the compartment side of the trunk plate, (b) It is DD sectional drawing. It is the B section enlarged view of FIG. It is a figure explaining the repair method when a crack generate | occur | produces only in the surface layer of a trunk | drum. It is sectional drawing explaining the repair method which concerns on another embodiment of this invention. It is a flowchart of the repair method which concerns on another embodiment of this invention.

Hereinafter, the repair method of the plate-shaped member which concerns on embodiment of this invention is demonstrated in detail with reference to drawings. Hereinafter, the plate member repairing method according to the present embodiment will be described by applying it to a body plate constituting a tail tube of a gas turbine.
In the present embodiment, the method for repairing the body plate constituting the transition piece of the combustor will be described, but the present invention is not limited to this, and a cooling air passage along the plate surface is provided inside. It can be applied to repair of plate-like members.

  As shown in FIG. 1, the gas turbine 100 of the present embodiment includes a compressor 51 that compresses outside air to generate compressed air, and fuel from a fuel supply source is mixed with the compressed air and burned to generate combustion gas. A plurality of combustors 1 to be generated and a turbine 53 driven by combustion gas are provided.

  The turbine 53 includes a casing 54 and a turbine rotor 55 that rotates within the casing 54. The turbine rotor 55 is connected to, for example, a generator (not shown) that generates electricity by the rotation of the turbine rotor 55. The plurality of combustors 1 are fixed to the casing 54 at equal intervals in the circumferential direction around the rotation axis S of the turbine rotor 55.

  As shown in FIG. 2, the combustor 1 includes an inner cylinder 58 housed in a casing 57, a fuel supply device 59 provided at a base end portion of the inner cylinder 58 and provided with a fuel nozzle 61, and a distal end The part has the tail tube 2 connected to the inner tube 58. The inner cylinder 58 is a cylindrical member that forms the inner wall surface of the combustion chamber 60. The tail cylinder 2 has an outer shape formed by a body plate 3 formed in a cylindrical shape around the axis T.

  As shown in FIG. 3, the body plate 3 forming the tail cylinder 2 is formed by bending a joined body of an outer body plate 4 and an inner body plate 5 which are two plates. Among the two plates constituting the body plate 3, the inner surface of the outer body plate 4 forming the outer periphery side of the body plate 3 has a plurality of grooves that are recessed in the outer periphery side and extend in the direction along the axis T. 6 is formed. An inner body plate 5, which is the other of the two plates constituting the body plate 3, is joined to the inner peripheral surface of the outer body plate 4. The opening of the groove 6 formed in the outer body plate 4 is closed by the inner body plate 5 to form a cooling air passage 7.

  In the body plate 3, for each of the plurality of cooling air passages 7, the cooling air inlet 8 opened to the outer peripheral side of the body plate 3, that is, the vehicle compartment 57, and the inner peripheral side of the body plate 3, that is, the combustion chamber 60 side An open cooling air outlet 9 is formed. That is, the body plate 3 is a plate-like member in which the cooling air passage 7 having one end opened on the vehicle compartment 57 side and the other end opened on the combustion chamber 60 side is provided along the plate surface.

  As shown in FIG. 2, most of the compressed air F from the compressor 51 is sent into the fuel supplier 59 of the combustor 1 and is injected into the tail cylinder 2 together with the fuel from the fuel supplier 59. In the transition piece 2, the fuel is combusted and a high-temperature combustion gas G is generated. This high-temperature combustion gas G flows from the tail cylinder 2 into the turbine 53 and rotates the turbine rotor 55.

  Further, in the transition piece 2, a part of the compressed air F from the compressor 51 serves as cooling air, and the cooling air inlet 8, the cooling air passage 7, and the cooling air outlet 9 of the tail pipe 2 are provided from the outer peripheral side thereof. It flows through. That is, the compressed air F flows as cooling air from the side of the casing 57, which is a high-pressure chamber, to the inside (combustion chamber 60 side) of the tail cylinder 2, which is a low-pressure chamber. At this time, the heat given from the high-temperature combustion gas G to the transition piece 2 is transferred to the cooling air through the inner surface of the cooling air passage 7. Thereby, it is prevented that the temperature of the trunk plate 3 constituting the tail cylinder 2 rises excessively.

Next, a method for repairing the trunk plate 3 will be described. Each of FIG. 5A to FIG. 10A is a plan view of the body plate 3 as viewed from the vehicle compartment 57 side, and each FIG. 5B is a cross-sectional view of the body plate 3.
As shown in FIGS. 5A and 5B, the repair method of the present embodiment is a case where a linear crack C penetrating through the body plate 3 in which the cooling air passage 7 is formed is generated. As shown in the flowchart of FIG. 4, the repairing method P1, the ruled line process P2, the first additional machining process P3, the first opening forming process P4, the second opening forming process P5, It has two addition processing steps P6 in this order.

As shown in FIG. 5A, the crack C penetrates the body plate 3 across the two cooling air passages 7 and is formed in a direction substantially orthogonal to the extending direction of the cooling air passages 7. ing. The length of the crack C and the direction in which it is formed are not limited to this.
In the following description, from the viewpoint of the flow direction of the cooling air flowing through the cooling air passage 7, the left side in FIGS. 5 to 10 is referred to as the upstream side, and the right side is referred to as the downstream side. The side on which the cooling air inlet 8 opens is referred to as the vehicle compartment 57 side, and the side on which the cooling air outlet 9 opens is referred to as the combustion chamber 60 side.

  As shown in FIGS. 6A and 6B, the removal processing step P1 removes the periphery of the crack C (the crack C generation portion) along the crack C generated in the body plate 3 using a grinder or the like. It is a process to process. The long hole 10 formed by the removal processing step is formed so that the grinder or the like is accessed from the outside of the tail cylinder 2, that is, from the casing 57 side, and penetrates to the inside of the tail cylinder 2, that is, the combustion chamber 60 side.

  As shown in FIGS. 7A and 7B, the ruled line process P2 is a process of providing a reference mark at a position where a first cooling hole 13 and a second cooling hole 14 to be described later are provided. The mark consists of a first mark 11 corresponding to the first cooling hole 13 and a second mark 12 corresponding to the second cooling hole 14, and the first mark 11 is upstream of the location where the crack C was formed. The second mark 12 is written downstream.

  Specifically, the first mark 11 and the second mark 12 are the inner peripheral surface of the long hole 10 with reference to the position of the cooling air passage exposed on the inner peripheral surface of the long hole 10 formed by the removal process. It is entered using a ruler needle or the like at a position that is further apart by a predetermined distance and that is just above the cooling air passage 7. The first mark 11 is written in one place in each exposed cooling air passage 7, and similarly, the second mark 12 is written in one place in each exposed cooling air passage 7. That is, when the two cooling air passages 7 are exposed on the inner peripheral surface of the long hole 10, two first marks 11 are written and two second marks 12 are written. In FIG. 6, two first marks 11 (second marks 12) are entered so as to be parallel to the long holes 10, but the long holes 10 of the first marks 11 (second marks 12). The distance from may be different.

As shown in FIG. 8A and FIG. 8B, in the first additional processing step P3, the cooling air passage 7 exposed by the long hole 10 is closed, and the material is obtained by the long hole 10, that is, removal processing. This is a process of filling the removed space.
Specifically, the long hole 10 is filled with a weld metal 16 by welding. Thereby, the trunk | drum 3 of the tail cylinder 2 becomes an external shape without a defect | deletion seeing from the original external shape. As a welding method used in this additional processing step, for example, TIG welding, MIG welding, plasma welding, carbon dioxide arc welding, MAG welding, and the like are applicable, but not limited thereto.

  At this time, it is preferable that portions of the weld metal 16 added to the long hole 10 that protrude from both surfaces of the body plate 3 are deleted, and both surfaces of the body plate 3 are finished flush. In this step, as a means for removing the protruding portion of the weld metal 16, a general cutting / grinding means such as a grinder is employed.

As shown in FIGS. 9A and 9B, the first opening forming step P4 and the second opening forming step P5 are steps for forming the first cooling hole 13 and the second cooling hole 14.
The first opening formation process P4 is a penetration that penetrates from the vehicle compartment 57 side to the combustion chamber 60 side using a drill tool or the like at the position of the first mark 11 written on the body plate 3 and immediately above the cooling air passage. This is a step of forming the first cooling hole 13 which is a hole. The diameter of the first cooling hole 13 may be substantially the same as the width of the cooling air passage 7 or may be sufficiently larger than the width of the cooling air passage 7 in order to reduce the complexity of the work.

  The second opening forming process P5 is a position of the second mark 12 written on the body plate 3, and the vehicle compartment 57 and the cooling air passage 7 are communicated from the side of the vehicle compartment 57 directly above the cooling air passage 7. This is a step of forming the second cooling hole 14. That is, unlike the first cooling hole 13, the second cooling hole 14 is not a through hole. The diameter of the second cooling hole 14 may be substantially the same as the width of the cooling air passage 7 or may be sufficiently larger than the width of the cooling air passage 7.

As shown in FIGS. 10A and 10B, the second additional processing step P <b> 6 is a step of closing a part of the first cooling hole 13. Specifically, the communication portion 13a that communicates the casing 57 and the cooling air passage 7 in the first cooling hole 13 is filled with the weld metal 17 by welding.
At this time, a portion of the weld metal 17 added to the communication portion 13 a that communicates between the casing 57 and the cooling air passage 7 is deleted from the surface of the trunk plate 3 on the side of the casing 57. It is preferable to finish the surface on the passenger compartment 57 side. In this step, as a means for removing the protruding portion of the weld metal 17, a general cutting / grinding means such as a grinder is employed.

Through the above steps, the body plate 3 of the transition piece 2 is filled with the elongated hole 10 that is a communication space that crosses the cooling air passage 7 and the cooling that opens into the inner peripheral surface of the elongated hole 10. A weld metal 16 that is a filling member that closes the opening of the air passage 7, a first cooling hole 13 that connects the cooling air passage 7 upstream of the weld metal 16 to the combustion chamber 60 side, and a downstream side of the weld metal 16. The plate-like member 3 has the second cooling hole 14 that allows the cooling air passage 7 to communicate with the vehicle compartment 57 side.
In addition, a welded metal 17 that is a closing member is filled in a communication portion 13 a that communicates the casing 57 of the first cooling hole 13 and the cooling air passage 7 in the plate-like member 3.

  According to the body plate repair method according to the above embodiment, the working fluid can be circulated to the upstream side and the downstream side with respect to the crack C of the cooling air passage 7 respectively. As a result, the cooling air passage 7 is not blocked by the repair of the crack C, and deterioration of various functions such as cooling can be prevented. Furthermore, it is not necessary to create a cover plate according to the shape of the crack to be repaired or to form a groove corresponding to the cover plate. Therefore, the plate member can be repaired in a short time and at a low cost while ensuring the cooling performance of the cooling air passage.

  Moreover, even when the access direction of the tool for forming the opening is limited only from the vehicle compartment 57 side, the repair method of the above embodiment can be used.

  Further, the first opening forming step P4 and the second opening forming step P5 are specified by specifying the locations where the first cooling holes 13 and the second cooling holes 14 are provided by referring to the positions of the cooling air passages 7 exposed in advance. Can be carried out easily and reliably.

In addition, the plate member repairing method according to the above embodiment can be applied to the split ring of the gas turbine 100.
As shown in FIG. 11, the split ring 21 is divided into a plurality of parts on the outer peripheral side of the rotor blade 22, that is, on the radially outer side. A blade ring 24 is provided on the radially outer side of the split ring 21 via a heat shield ring (heat resistant part) 23. A flow path 25 that opens toward the split ring 21 is formed in the blade ring 24, and is supplied from an air supply source (not shown) provided outside the gas turbine 100 in the flow path 25. The air extracted or the air extracted from the compressor 51 is caused to flow in the direction of the arrow 26 as a cooling medium.

  An impingement plate 27 is attached to the heat shield ring 23. The impingement plate 27 is disposed between the blade ring 24 and the split ring 21, and has a plurality of coolings for passing air blown from the flow path 25 to the outer peripheral surface (radially outer peripheral surface). A hole 28 is provided.

The cooling air passage 29 of the split ring 21 extends from the upstream side of the outer peripheral surface of the split ring 21 in the axial direction (left side in FIG. 11) to the inside of the split ring 21 substantially parallel to the axial direction and penetrates the downstream end face. It is provided to do. (Although only one is shown in FIG. 11, a plurality of cooling air passages 29 are arranged in a row in a direction perpendicular to the paper surface.
The repair method of the present invention can be similarly applied even when a crack occurs in the above-described split ring 21.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, the long hole formed in the removal processing step P1 for removing the periphery of the crack C generated in the body plate 3 is not limited to the through hole. For example, as shown in FIG. 12 (a), when the crack C is formed only on the outer shell plate 4 side of the shell plate 3, as shown in FIG. It is not necessary to form it only on the outer body plate 4 side and penetrate both surfaces of the body plate 3. Thereby, as shown in FIG.12 (c), since the weld metal 16B does not leak to the inner peripheral side of the trunk | drum 3, the operation | work of the 1st addition process P3 becomes easy.

  Further, the cooling air inlet 8 and the cooling air outlet 9 do not necessarily have to be opened to the vehicle compartment 57 side and the combustion chamber 60 side, respectively. For example, as shown in FIG. 13A, FIG. 13B, and FIG. 13C, the cooling air may be structured to flow in or out from the end surfaces 3a and 3b of the plate-like member 3, This is a matter that should be appropriately designed according to the location where the plate-like member 3 is used.

  Further, the first cooling hole 13 and the second cooling hole 14 may be formed before the removal processing step P1, that is, before the crack C is removed. In this case, it is necessary to use a diagnostic device that can estimate the position of the cooling air passage using X-rays, ultrasonic waves, or the like without destroying the plate member.

  Moreover, after performing the removal process P1, the ruled line process P2 is abbreviate | omitted and the 1st opening formation process P4 is performed, Then, the 1st additional processing process P3, the 2nd opening formation process P5, and the 2nd additional processing process P6 may be performed. In this case, in the first opening formation process P4, positioning is performed while visually observing the cooling passage 7 exposed in the removal processing process P1.

  Further, when access is possible from both sides of the plate-like member 3 such as when the repair technique according to the present invention is applied to the split ring, as shown in the flowchart of FIG. Only the hole up to the position of the cooling passage 7 may be provided without forming the hole, and the second additional processing step P6 may be omitted. By performing the repair in this way, the labor of the work can be further reduced.

DESCRIPTION OF SYMBOLS 1 ... Combustor, 2 ... Tail tube, 3 ... Body plate (plate-shaped member), 7 ... Cooling air passage (cooling passage), 10 ... Slot (area), 11 ... First mark (ruled line), 12 ... First Two marks (ruled lines), 13 ... first opening (first cooling hole), 13a ... communication portion (third opening), 14 ... second opening (second cooling hole), 16 ... welded metal (filling member), 17 ... weld metal (blocking member), 21 ... split ring, 57 ... vehicle compartment (high pressure space), 60 ... combustion chamber (low pressure space), 100 ... gas turbine, C ... crack (damaged part).

Claims (9)

A method for repairing a plate-like member that is disposed so as to separate a high-pressure space and a low-pressure space, and has a cooling passage provided inside along the plate surface,
A removal processing step of removing the damaged portion of the plate-like member and exposing the cooling passage;
An additional processing step of closing the exposed cooling passage and filling the region from which the material has been removed by the removal processing step, closing the exposed cooling passage and forming an outer shape free from defects as seen from the original outer shape;
A first opening forming step of providing a first opening for communicating the cooling passage with the low-pressure space on the upstream side of the position where the cooling passage is closed when viewed from the refrigerant flow direction of the cooling passage;
A second opening forming step of providing a second opening that communicates the cooling passage with the high-pressure space on the downstream side of the position where the cooling passage is blocked when viewed from the refrigerant flow direction of the cooling passage. To repair plate-like members. In the first opening forming step, the first opening is provided by forming a through-hole penetrating from the surface on the high-pressure space side of the plate-like member to the surface on the low-pressure space side,
2. The plate member repairing method according to claim 1, further comprising a second additional processing step of filling and closing a portion of the through hole that connects the high-pressure space and the cooling passage.   2. A ruled line step of providing a ruled line at a position where the first opening is provided and a position where the second opening is provided between the removing process and the additional process. The repair method of the plate-shaped member of any one of 2. It is a plate-like member that is arranged so as to separate the high-pressure space and the low-pressure space, and is provided with a cooling passage inside along the plate surface,
An elongated hole communicating the at least one of the high-pressure space and the low-pressure space with the cooling passage;
A filling member provided to fill the elongated hole ;
An opening provided on the low-pressure space side of the plate-shaped member, the first opening communicating the cooling passage with the low-pressure space on the upstream side of the filling member as viewed from the flow direction of the refrigerant flowing through the cooling passage. When,
An opening provided on the high-pressure space side of the plate-shaped member, the second opening communicating the cooling passage with the high-pressure space on the downstream side of the filling member as viewed from the flow direction of the refrigerant flowing through the cooling passage. And a plate-like member.   A closing member that closes a through hole penetrating from the low pressure space to the high pressure space at a position corresponding to the first opening on the high pressure space side from a position where the through hole and the cooling passage intersect is provided. The plate-like member according to claim 4.   A combustor for a gas turbine comprising the plate member according to any one of claims 4 and 5. A combustor for a gas turbine according to claim 6,
The combustor includes the plate-shaped member molded into a cylindrical shape,
The plate-like member includes an outer body plate having a groove formed on a surface facing the low-pressure space side, and an inner body plate joined to a surface facing the low-pressure space side of the outer body plate,
The high-pressure space is a space inside the casing of the gas turbine and outside the combustor,
The gas turbine combustor, wherein the low-pressure space is a space inside the combustor.   A split ring comprising the plate-like member according to any one of claims 4 and 5.   A gas turbine comprising the member according to any one of claims 6 to 8.

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