JP5925090B2 - Inspection jig for bent piping and inspection method - Google Patents

Description

  The present disclosure relates to an inspection jig and an inspection method for bent pipes (for example, elbows and bends).

  Conventionally, bent piping has been used in various applications including power plants, chemical plants, gas plants, water treatment plants and the like. Curved piping includes elbows with a relatively small radius of curvature and bends with a relatively large radius of curvature.

This type of bent piping may be deformed or damaged with long-term use depending on the usage environment. For example, in a bent pipe in which a high-temperature fluid flows inside, a stress may be generated due to thermal elongation of the bent pipe, and a crack may occur. Further, in a bent pipe in which a corrosive fluid flows inside, there is a possibility that the wall thickness of the pipe wall is reduced.
Deformed or damaged bent pipes need to be repaired by welding or the like. At this time, when the bent pipe after repair by welding or the like is assembled to the pipe to which the bent pipe is connected, an inspection method for the bent pipe is required to check whether the bent pipe has a desired shape.

  By the way, Patent Document 1 discloses an inspection apparatus for performing an ultrasonic flaw detection test on an elbow weld that connects a core spray pipe and a shroud in a nuclear power plant, and checking whether there is a defect in the elbow weld. Has been.

JP 2001-116878 A

  However, the inspection apparatus described in Patent Document 1 is for identifying a defect in the elbow weld, and whether the bent pipe after repair has a desired shape in relation to the pipe to which the bent pipe is connected. It is not intended to inspect bent piping from the viewpoint of.

  Accordingly, an object of at least one embodiment of the present invention is to provide an inspection jig and inspection method for a bent pipe for checking whether the bent pipe after repair has a desired shape in relation to the pipe to which the bent pipe is connected. Is to provide.

An inspection jig for bent piping according to at least one embodiment of the present invention has a proximal end portion provided with a flange for fastening to the first piping, and a distal end portion attached to the second piping, A jig for inspecting a bent pipe used for connection between the first pipe and the second pipe,
A base portion configured to fix the base end portion of the bent pipe by fastening with the flange;
A ring portion having an inner diameter larger than an outer diameter of the distal end portion of the bent pipe, and forming an annular gap for inspection between the outer peripheral surface of the distal end portion and surrounding the distal end portion;
According to the relative relationship between the attachment position of the base end portion to the first pipe and the attachment position of the tip end portion to the second pipe, the ring portion with respect to the attachment position of the base end portion to the base portion And a support portion configured to support the ring portion on the base portion so that a relative position is determined.

In the inspection jig, the relative position of the ring portion with respect to the mounting position of the base end portion of the bent pipe to the base portion is the mounting position of the base end portion of the bent pipe to the first pipe and the bent pipe to the second pipe. It is determined according to the relative relationship with the mounting position of the tip of the. That is, the relative position of the ring portion with respect to the distal end portion of the bent pipe in a state where the base end portion of the bent pipe is attached to the base portion of the inspection jig is the bent position when the bent pipe is actually assembled to the first pipe. It corresponds to the relative position of the second pipe with respect to the tip of the pipe.
Therefore, when the base end of the bent pipe is attached to the base part of the inspection jig, the first pipe and the second pipe are used by utilizing an annular gap formed between the distal end of the bent pipe and the ring part. In relation to the piping, it is possible to check whether the relative position of the distal end portion with respect to the proximal end portion of the bent piping is within an allowable range. That is, the shape of the bent pipe can be confirmed using the base end portion of the bent pipe as a reference.

In one embodiment, the base portion is provided with a plurality of clearance holes corresponding to the plurality of fastening holes provided in the flange, and the flange portion of the base portion corresponds to each clearance hole. A plurality of positioning nuts provided on the opposite side of the mounting surface, a fixing member for fixing each positioning nut on the opposite side of the flange mounting surface of the base portion, and an outer diameter that can be fitted in the fastening hole A plurality of positioning bolts inserted through the fastening holes and the clearance holes and screwed to the positioning nuts fixed to the base portion by the fixing members, Based on the position of the screw hole into which the positioning bolt of each positioning nut is fixed in the state fixed to the base portion, Position of the ring portion to be lifting are determined.
The positioning nut is fixed to the opposite side of the flange mounting surface of the base portion by a fixing member. Therefore, the positioning nut is not affected by the hole diameter accuracy of the clearance hole of the base portion, and is held by the fixing member at a predetermined position of the base portion. As a result, the position of the positioning bolt that is screwed into the screw hole of the positioning nut is also accurately determined. Furthermore, since the positioning bolt has an outer diameter that can be fitted into a fastening hole provided in the flange of the bent pipe, the mounting position of the bent pipe on the base of the flange is accurately determined by the positioning bolt. On the other hand, the position of the ring portion supported by the support portion is determined based on the screw hole of the positioning nut. Therefore, it is possible to more accurately check the shape of the bent pipe based on the base end portion of the bent pipe.

In some embodiments, the support portion includes a pair of support plates that are erected on the base portion along the curved pipe on both sides of the curved pipe in a state where the flange is fastened to the base portion. Each support plate has an inclined surface inclined with respect to the base portion according to an angle formed by the distal end portion of the bent pipe with respect to the base end portion, and the ring portion includes a pair of It is attached to the inclined surface of each support plate so as to be bridged between the support plates.
Thus, by attaching the ring portion to the inclined surface of each support plate so as to be bridged between the pair of support plates, the accuracy of the attachment position and angle of the ring portion with respect to the base portion can be improved.

In some embodiments, the support portion includes a support column erected on the base portion on the distal end side of the bent pipe in a state where the flange is fastened to the base portion, and the support The column has an inclined surface inclined with respect to the base portion according to an angle formed by the distal end portion of the bent pipe with respect to the base end portion, and the ring portion is the inclined surface of the support column. Attached to.
In this way, by attaching the ring part to the inclined surface of the support column that is placed on the base part on the tip side of the bent pipe with the flange fastened to the base part, the mounting position of the ring part with respect to the base part In addition, the accuracy of the angle can be improved.

In one embodiment, at least the ring part is configured to be detachable from the base part.
Thereby, the operation of setting and removing the bent pipe from the inspection jig can be easily performed.

An inspection method for a bent pipe according to at least one embodiment of the present invention includes a proximal end portion provided with a flange for fastening to a first pipe, and a distal end portion attached to a second pipe. A method for inspecting a bent pipe used for connection between a pipe and the second pipe,
A base portion, a ring portion having an inner diameter larger than the outer diameter of the distal end portion of the bent pipe, an attachment position of the base end portion to the first pipe, and an attachment position of the distal end portion to the second pipe A support portion configured to support the ring portion on the base portion such that a relative position of the ring portion with respect to a mounting position of the base end portion to the base portion is determined in accordance with a relative relationship between A first determination step of determining whether a relative position of the distal end portion with respect to the base end portion of the bent pipe is within an allowable range using an inspection jig including:
In the first determination step, an outer peripheral surface of the distal end portion of the bent pipe and the ring in a state where the base end portion of the bent pipe is fixed to the base portion of the inspection jig by fastening with the flange. It is determined whether the relative position of the tip portion with respect to the base end portion is within an allowable range based on an annular gap formed between the inner peripheral surface of the portion.

In the inspection jig used in the inspection method, the relative position of the ring portion with respect to the mounting position of the base end portion of the bent pipe to the base portion is the same as the mounting position of the base end portion of the bent pipe to the first pipe and the second position. It is determined according to the relative relationship with the mounting position of the tip of the bent pipe to the pipe. That is, the relative position of the ring portion with respect to the distal end portion of the bent pipe in a state where the base end portion of the bent pipe is attached to the base portion of the inspection jig is the bent position when the bent pipe is actually assembled to the first pipe. It corresponds to the relative position of the second pipe with respect to the tip of the pipe.
Therefore, when the base end of the bent pipe is attached to the base part of the inspection jig, the first pipe and the second pipe are used by utilizing an annular gap formed between the distal end of the bent pipe and the ring part. In relation to the piping, it is possible to check whether the relative position of the distal end portion with respect to the proximal end portion of the bent piping is within an allowable range. That is, it is possible to inspect the shape of the bent pipe with reference to the base end portion of the bent pipe.

In one embodiment, the inspection method maintains the state in which an annular gap having a size within an allowable range is formed between the outer peripheral surface of the tip portion and the inner peripheral surface of the ring portion. By determining whether or not the flange can be fastened to the base portion, whether or not the flange can be fastened to the first pipe in a state where the tip of the bent pipe is attached to the second pipe. A second determination step of determining whether or not
Thus, the inspection using the inspection jig is performed to determine whether the base end of the bent pipe can be fastened to the first pipe with the distal end of the bent pipe connected to the second pipe. It can be carried out. That is, it is possible to check whether or not the bent pipe can be actually assembled to the first pipe and the second pipe with the tip of the bent pipe as a reference.

In one embodiment, the base portion is provided with a plurality of clearance holes corresponding to the plurality of fastening holes provided in the flange, and the flange portion of the base portion corresponds to each clearance hole. A step of fixing a plurality of positioning nuts on the opposite side of the mounting surface, and a positioning bolt having an outer diameter that can be fitted into the fastening hole are inserted into the fastening hole and the clearance hole and fixed to the base portion. Screwing the positioning bolt onto the positioning nut, and the inspection jig is based on the position of the screw hole into which the positioning bolt of each positioning nut is screwed in a state of being fixed to the base portion. The position of the ring portion supported by the support portion is determined, and in the first determination step, the positioning bolt is In a state where it is screwed to the serial positioning nut entered into the flange to the base portion, or the relative position is within the allowable range or not.
The positioning nut is fixed to the opposite side of the flange mounting surface of the base portion by a fixing member. Therefore, the positioning nut is not affected by the hole diameter accuracy of the clearance hole of the base portion, and is held by the fixing member at a predetermined position of the base portion. As a result, the position of the positioning bolt that is screwed into the screw hole of the positioning nut is also accurately determined. Furthermore, since the positioning bolt has an outer diameter that can be fitted into a fastening hole provided in the flange of the bent pipe, the mounting position of the bent pipe on the base of the flange is accurately determined by the positioning bolt. On the other hand, the position of the ring portion supported by the support portion is determined based on the screw hole of the positioning nut. Therefore, by performing the first step with the positioning bolt screwed to the positioning nut, it is possible to more accurately check the shape of the bent pipe with reference to the proximal end portion of the bent pipe.

In one embodiment, the inspection method maintains the state in which an annular gap having a size within an allowable range is formed between the outer peripheral surface of the tip portion and the inner peripheral surface of the ring portion. By determining whether or not the flange can be fastened to the base portion, whether or not the flange can be fastened to the first pipe in a state where the tip of the bent pipe is attached to the second pipe. A second determination step for determining whether the flange can be fastened to the base portion using a fastening bolt for fastening the flange to the first pipe. Determine whether.
In the first determination step, the shape of the bent pipe is inspected with reference to the proximal end portion of the bent pipe, using a positioning bolt having an outer diameter that can be fitted into the fastening hole. On the other hand, in the second determination step, instead of the positioning bolt, a fastening bolt for actually fastening the flange to the first pipe is used in the second determination step, and the first pipe and the second pipe are used with the tip of the bent pipe as a reference. An inspection is performed as to whether or not two pipes can be attached to a bent pipe. Thus, in the first determination step and the second determination step, the bolts used for fastening the flange of the bent pipe and the base portion of the inspection jig are properly used, and the above-described two types of inspection are performed by the inspection jig. be able to.

  According to at least one embodiment of the present invention, the annular gap formed between the distal end portion of the bent pipe and the ring portion when the base end portion of the bent pipe is attached to the base portion of the inspection jig is used. And it can be investigated whether the relative position of the front-end | tip part with respect to the base end part of bending piping is in an allowable range by the relationship with 1st piping and 2nd piping. That is, the shape of the bent pipe can be confirmed using the base end portion of the bent pipe as a reference.

It is a figure which shows the gas turbine combustor provided with the tail-tube elbow. (A) is a figure which shows the detailed structure of a transition piece elbow periphery in FIG. 1, (b) is an enlarged view of the area | region shown by A in FIG. 2 (a). It is a side view which shows the jig | tool for the inspection of the curved piping in one Embodiment. FIG. 4 is a front view of the inspection jig viewed from a direction B in FIG. 3. It is a figure which shows the base part of the jig | tool for an inspection seen from the C direction of FIG. It is a figure which shows the use condition of the jig | tool for an inspection which concerns on one Embodiment. It is a side view which shows the jig | tool for the inspection of the bent piping which concerns on one Embodiment. FIG. 8A is a front view of the inspection jig viewed from the direction D in FIG. FIG.8 (b) is FF sectional drawing of Fig.8 (a). It is a figure which shows the base part of the jig | tool for an inspection seen from the E direction of FIG. It is a figure which shows the use condition of the jig | tool for an inspection which concerns on one Embodiment. It is a flowchart which shows the work procedure of repair and inspection of a transition piece elbow. (A) And (b) is sectional drawing which respectively shows the structure of the fastening part periphery with the flange in the jig | tool for an inspection which concerns on one Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention, but are merely illustrative examples.

  Below, embodiment which made the inspection object the tail-tube elbow of a gas turbine combustor is described. However, it goes without saying that the inspection jig and inspection method of the present invention can also be applied to bent pipes used for arbitrary parts in various uses including power plants, chemical plants, gas plants, water treatment plants and the like.

  FIG. 1 is a diagram illustrating a gas turbine combustor including a tail cylinder elbow as an inspection target in one embodiment. FIG. 2 is a diagram showing a detailed structure around the transition piece elbow in FIG.

As shown in FIG. 1, the gas turbine combustor 1 (hereinafter referred to as “combustor 1”) is provided in the interior space of the passenger compartment 2 between the compressor and the gas turbine. The combustor 1 includes a combustion nozzle 3 including a pilot nozzle 3A and a main nozzle 3B, an inner cylinder 4 that covers the combustion nozzle 3, and a tail cylinder 6 that is connected to the inner cylinder 4 and guides combustion gas to the gas turbine side. .
The inner cylinder 4 may be referred to as a “swirler support cylinder”, and the tail cylinder 6 may be referred to as a “combustion cylinder” or a “transition piece”.

  Compressed air supplied from the compressor flows into the interior space of the passenger compartment 2 and is then taken into the inner cylinder 4 and used as combustion air. The combustion nozzle 3 injects fuel (pilot fuel and main fuel) supplied from a fuel supply pipe (not shown) and burns the fuel using combustion air. The combustion gas thus generated in the combustor 1 is supplied to the gas turbine via the tail cylinder 6.

  The combustor 1 is provided with a bypass duct 7 for taking compressed air from the interior space of the passenger compartment 2 into the tail cylinder 6 in order to adjust the air-fuel ratio in the combustion region during partial load operation. The flow rate of the compressed air flowing into the transition piece 6 through the bypass duct 7 is adjusted by a bypass valve 8 provided in the bypass duct 7. The opening degree of the bypass valve 8 is controlled according to the load of the gas turbine so that the air-fuel ratio in the combustion region is maintained within a desired range.

The bypass duct 7 includes a valve support pipe (second pipe) 9 on which the bypass valve 8 is mounted, and a tail cylinder elbow (curved pipe) 10 for connecting the valve support pipe 9 to the tail cylinder (first pipe) 6. Consists of. The transition piece elbow 10 is provided with a flange 13. The flange 13 is fastened to a flange 6A provided on the tail cylinder 6. Thereby, the bypass duct 7 is connected to the transition piece 6.
The flange 13 of the transition piece elbow 10 and the flange 6A of the transition piece 6 may be fitted in the spigot 11. That is, the flange 13 is provided with an annular protrusion 15, and the protrusion 15 and a recess provided in the flange 6 </ b> A corresponding to the protrusion 15 may be fitted in the spigot 11. .

  As shown in FIG. 2A, the transition piece elbow 10 includes a proximal end portion 12 provided with a flange 13 for fastening to a flange 6A on the transition piece (first pipe) 6 side, and a valve support pipe (first pipe). 2 piping) 9 and a tip end portion 14 attached to 9. The transition piece elbow 10 has a curved shape between the proximal end portion 12 and the distal end portion 14, and the end surface of the distal end portion 14 has an inclination angle α with respect to the end surface of the proximal end portion 12.

As shown in FIG. 2B, the flange 13 of the transition piece elbow 10 is provided with a fastening hole 16 through which a fastening bolt 18 is inserted. On the other hand, a clearance hole 17 through which the fastening bolt 18 is inserted is also provided in the flange 6A on the tail tube (first pipe) 6 side. A male screw portion is formed on the distal end side of the fastening bolt 18, and a nut 19 is screwed to the male screw portion. By inserting the fastening bolt 18 through the fastening hole 16 and the clearance hole 17 and screwing the nut 19 into the male thread portion of the fastening bolt 18, the flange 13 and the flange 6 </ b> A are fastened.
The fastening holes 16 and the clearance holes 17 are not internally threaded, and a gap is formed between the fastening holes 16 and the clearance holes 17 and the fastening bolts 18. The gap is about 0.5 mm, for example.

  Next, an inspection jig for the transition piece elbow 10 having the above configuration will be described. FIG. 3 is a side view showing the inspection jig of the transition piece elbow 10 in one embodiment. FIG. 4 is a front view of the inspection jig viewed from the direction B in FIG. FIG. 5 is a view showing the base portion of the inspection jig viewed from the direction C in FIG.

  As shown in FIGS. 3 and 4, the inspection jig 20 includes a base portion 22, a ring portion 24 having an opening 25, and a support portion 30 that supports the ring portion 24 on the base portion 22.

As shown in FIGS. 3 and 5, the base portion 22 has clearance holes at positions corresponding to the plurality of fastening holes 16 provided in the flange 13 of the tail cylinder elbow 10 in a state where the base portion 22 is attached to the inspection jig 20. 40 is provided. Each clearance hole 40 is generally located on a circular locus (PCD: Pitch Circle Diameter) 41 of the fastening hole 16 through which the center of the fastening hole 16 of the flange 13 fixed to the base portion 22 passes.
In some embodiments, the clearance hole 40 of the base portion 22 has the same shape as the clearance hole 17 (see FIG. 2B) in the actual machine of the combustor 1. Specifically, a female screw is not cut in the clearance hole 40, and if the fastening bolt 18 is inserted into the clearance hole 40, the clearance hole 40 has a space between the wall surface of the clearance hole 40 and the outer peripheral surface of the shaft portion of the fastening bolt 18. For example, a gap having a size of about 0.5 mm is formed.
On the back side of the base portion 22, a recess 42 is provided corresponding to each clearance hole 40. Each clearance hole 40 opens at the bottom surface of the corresponding recess 42. Each recess 42 is provided with a plurality of screw holes 44 in which female threads are formed. Similar to the clearance hole 40, the screw hole 44 opens at the bottom surface of the recess 42.

In some embodiments, the support portion 30 may include a base portion along the tail tube elbow 10 on both sides of the tail tube elbow 10 with the flange 13 fixed to the base portion 22 as shown in FIGS. 22 includes a pair of support plates 32 erected on 22. Each support plate 32 is positioned with respect to the base portion 22 by at least one pin 34 and is attached to the base portion 22 by at least one fastening member 36.
Each support plate 32 has an inclined surface 33 that is inclined with respect to the base portion 22 in accordance with an angle α that the distal end portion 14 of the transition piece elbow 10 forms with respect to the proximal end portion 12. In the embodiment shown in FIG. 3, the inclined surface 33 is inclined with respect to the base portion 22 by an angle α.

In some embodiments, the ring portion 24 is attached to the inclined surface 33 of each support plate 32 so as to be bridged between the pair of support plates 32 as shown in FIGS. Attachment to the inclined surface 33 of the ring part 24 may be performed using the taper pin 26 in which the external thread 27 is formed. The ring portion 24 can be aligned with respect to the support plate 32 with high accuracy by driving the taper pin 26 into the tapered holes provided in the end portions on both sides of the ring portion 24 and the inclined surface 33 of each support plate 32. .
Note that the opening 25 of the ring portion 24 is larger than the outer diameter of the distal end portion 14 of the transition piece elbow 10. That is, the ring portion 24 has an inner diameter larger than the outer diameter of the tip portion 14 of the transition piece elbow 10, and the outer peripheral surface of the tip portion 14 of the transition piece elbow 10 in a state where the flange 13 is fixed to the base portion 22. An inspection-use annular gap G1 (see FIG. 6A) is formed between them.

At least the ring part 24 is detachably provided with respect to the base part 22.
Specifically, each support plate 32 is detachably fixed to the base portion 22 by a fastening member 36. Further, the ring portion 24 is fixed to each support plate 32 by the taper pin 26. However, if the nut 28 screwed to the male screw 27 of the taper pin 26 is rotated, the taper pin 26 is removed and the pair of support plates 32, It is also possible to remove the ring portion 24 from 32.

  Next, a method of using the inspection jig 20 having the above configuration will be described. FIGS. 6A and 6B are views showing a usage state of the inspection jig 20.

As shown in FIG. 6A, the flange 13 of the tail cylinder elbow 10 is fixed to the base portion 22 using positioning bolts 46 and positioning nuts 48.
In some embodiments, a positioning nut 48 is disposed in the recess 42 of the base portion 22, and the positioning nut 48 is positioned and fixed to the base portion 22 by a fixing member 45. In the embodiment shown in FIG. 6A, the fixing member 45 is a bolt that is screwed into a plurality of screw holes 44 provided in each recess 42. (Note that only one bolt 45 is shown in FIG. 6A, but in actuality, each of the plurality of screw holes 44 (see FIG. 5) provided in each recess 42 has a bolt 45. Is screwed in.)
A positioning bolt 46 inserted through the fastening hole 16 of the flange 13 and the clearance hole 40 of the base portion 22 is screwed into the positioning nut 48 fixed to the base portion 22. Thus, the flange 13 of the transition piece elbow 10 is fixed to the base portion 22.

The shaft portion 47 of the positioning bolt 46 is larger than the outer diameter of the shaft portion of the fastening bolt 18 and has an outer diameter that can be fitted into the fastening hole 16. Therefore, the gap formed between the wall surface of the fastening hole 16 and the shaft portion 47 is smaller than the gap between the wall surface of the fastening hole 16 and the fastening bolt 18. The gap between the wall surface of the fastening hole 16 and the shaft portion 47 is, for example, about 0.05 to 0.1 mm.
In some embodiments, the positioning bolt 46 is a bolt having a shaft portion 47 with an outer diameter slightly smaller than the diameter of the fastening hole 16. In this case, the wall surface of the fastening hole 16 and the outer peripheral surface of the shaft portion 47 are in close contact with each other, so that a gap is not substantially formed between them, and the relative positioning of both is possible.

The positioning nut 48 is held at a predetermined position of the base portion 22 by the fixing member 45 without being affected by the hole diameter accuracy of the clearance hole 40 of the base portion 22. As a result, the position of the positioning bolt 46 screwed into the screw hole of the positioning nut 48 is also accurately determined. Further, the shaft portion 47 of the positioning bolt 48 has a larger diameter than the shaft portion of the fastening bolt 18, and the gap between the wall surface of the fastening hole 16 and the shaft portion 47 is relatively small. Therefore, the PCD 41 (see FIG. 5) of each fastening hole 16 coincides with a circular locus through which the center (nut center) of the screw hole of each positioning nut 48 passes.
Thus, the position of the flange 13 of the transition piece elbow 10 positioned by the positioning bolt 46 is accurately determined with respect to the base portion 22 without being affected by the hole diameter accuracy of the clearance hole 40 of the base portion 22. .

On the other hand, the ring portion 24 of the inspection jig 20 is supported by the support portion 30 at a predetermined position with reference to the screw hole of the positioning nut 48 positioned by the fixing member 45 with respect to the base portion 22. That is, the pin 34 and the taper pin 26 allow the center of the ring portion 24 to have a predetermined relative positional relationship with respect to the circular locus (PCD 41 of the fastening hole 16) through which the nut center of each positioning nut 48 passes. The ring portion 24 is positioned with respect to the base portion 22 through the pair of support plates 32. Here, the “predetermined relative positional relationship” refers to the mounting position of the base end portion 12 of the tail cylinder elbow 10 to the flange 6A on the tail cylinder (first pipe) 6 side, and the valve support pipe (first pipe). (2 piping) is a positional relationship according to the relative relationship with the mounting position of the tip end portion 14 of the transitional tube elbow 10 to 9.
Therefore, the relative position of the ring portion 24 with respect to the distal end portion 14 of the tail tube elbow 10 in a state where the flange 13 of the tail tube elbow 10 is attached to the base portion 22 is the same as when the tail tube elbow 10 is actually assembled to the tail tube 6. This corresponds to the relative position of the valve support pipe 9 with respect to the tip portion 14.

Therefore, utilizing the annular gap G1 formed between the outer peripheral surface of the distal end portion 14 of the tail tube elbow 10 and the inner peripheral surface of the ring portion 24, the tail tube (first pipe) 6 and the valve support pipe (first It is possible to check whether the relative position of the distal end portion 14 with respect to the proximal end portion 12 of the transitional tube elbow 10 is within an allowable range. That is, the shape of the transition piece elbow 10 can be confirmed with reference to the base end portion 12 of the transition piece elbow 10 (more precisely, the PCD 41 of the fastening hole 16).
For example, by measuring the size of the annular gap G1 at a plurality of circumferential positions and checking whether the variation of these measured values is within the allowable range, the inspection regarding the shape of the tail cylinder elbow 10 can be performed. Good.

Further, the inspection jig 20 uses a fastening bolt 18 and a nut 19 for fastening the flange 13 to the tail cylinder 6 (first pipe) side, and uses the tail cylinder 6 (first pipe) and valve support pipe (second pipe). Inspection from the viewpoint of whether the transition piece elbow 10 can be assembled to the pipe 9).
In order to perform this inspection, as shown in FIG. 6B, the annular gap G2 between the outer peripheral surface of the tip end portion 14 of the transition piece elbow 10 and the inner peripheral surface of the ring portion 24 is maintained within an allowable range. However, it is determined whether the fastening to the base portion 22 of the flange 13 is possible using the fastening bolt 18 and the nut 19. Thereby, the flange 6A of the tail cylinder (first pipe) 6 of the base end part 12 of the tail cylinder elbow 10 in a state where the distal end portion 14 of the tail cylinder elbow 10 is actually connected to the valve support pipe (second pipe) 9. It is possible to check whether or not it is possible to conclude the connection. That is, using the tip 14 of the transition piece elbow 10 as a reference, inspecting whether the transition piece elbow 10 can be actually assembled to the transition piece (first pipe) 6 and the valve support pipe (second pipe) 9 is possible. Can do.
Note that such an inspection can be performed because a clearance hole 40 simulating the clearance hole 17 of the flange 6 </ b> A of the tail tube (second pipe) 6 is formed in the base portion 22.

Furthermore, the inspection jig for the transition piece elbow 10 according to another embodiment will be described. FIG. 7 is a side view showing an inspection jig for the transition piece elbow 10 according to another embodiment. 8A is a front view of the inspection jig viewed from the direction D in FIG. 7, and FIG. 8B is a cross-sectional view taken along line FF in FIG. 8A. FIG. 9 is a view showing the base portion of the inspection jig viewed from the direction E of FIG.
7-9, the same code | symbol is attached | subjected to the part which is common in the inspection jig of embodiment shown in FIGS. 3-6, and the description is abbreviate | omitted below suitably.

  7 and 8, the inspection jig 50 includes a base portion 52, a ring portion 53 having a ring position adjusting portion 54 and an opening 55, and the ring portion 53 via the ring position adjusting portion 54 as a base portion. 52 and a support portion 56 supported on 52.

As shown in FIGS. 7 and 9, the base portion 52 is provided with clearance holes 40 at positions corresponding to the plurality of fastening holes 16 provided in the flange 13 of the tail cylinder elbow 10. Each clearance hole 40 is generally located on the PCD 41 of the fastening hole 16 of the flange 13 fixed to the base portion 52.
A recess 42 is provided on the back side of the base portion 52 corresponding to each clearance hole 40. Each clearance hole 40 opens at the bottom surface of the corresponding recess 42. Each recess 42 is provided with a plurality of screw holes 44 in which female threads are formed. Similarly to the clearance hole 40, the screw hole 44 also opens at the bottom surface of the recess 42.

  In some embodiments, as shown in FIGS. 7 and 8, the support portion 56 stands on the base portion 52 on the distal end portion 14 side of the transition piece elbow 10 in a state where the flange 13 is fixed to the base portion 52. The support pillar 57 provided is included. The support column 57 is attached to the base portion 52 by at least one fastening member 59.

  Further, as shown in FIGS. 8A and 8B, the distal end portion 14 bends on the upper surface of the support column 57 in the axial direction of the tail tube elbow 10 (relative to the base end portion 12 of the tail tube elbow 10). A V-shaped groove 58 is provided along the direction perpendicular to the direction D in FIG. The V-shaped groove 58 is formed by an inclined surface 58a located on the distal end portion 14 side of the transition piece elbow 10 and an inclined surface 58b having a larger distance from the distal end portion 14 than the inclined surface 58a. The inclined surface 58a and the inclined surface 58b are substantially orthogonal to each other. The inclination of the inclined surface 58a is determined according to the angle α formed by the distal end portion 14 of the transition piece elbow 10 with respect to the proximal end portion 12.

  Further, a circular groove 62 having a U-shaped cross section is formed in the vicinity of the center of the inclined surface 58b along the axial direction of the transition piece elbow 10. The circular groove 62 is provided from the upper surface of the support column 57 to the groove bottom of the V-shaped groove 58 (intersection line of the inclined surfaces 58a and 58b).

  The ring portion 53 is attached to the inclined surfaces 58 a and 58 b of the support column 57 via the ring position adjusting portion 54. That is, as shown in FIGS. 7, 8 (a) and 8 (b), the ring position adjusting portion 54 is formed on the inclined surface 58 b in the vicinity of the center of the side surface 54 b disposed to face the inclined surface 58 b. A convex portion 54 a that protrudes from the side wall 54 b is formed at a position facing the circular groove 62. The side surfaces 54c forming the convex portions 54a are formed so as to be parallel to each other, and are formed so as to fit between the side walls on both sides of the circular groove 62 formed in the inclined surface 54b.

  With the configuration of the ring portion 53 and the support column 57, the ring position adjusting portion 54 is placed so as to contact the inclined surface 58a and the inclined surface 58b, and the convex portion 54a is fitted along the side wall of the circular groove 62. Accordingly, the ring portion 53 can be positioned with respect to the distal end portion 14 of the transition piece elbow 10 in the axial direction of the transition piece elbow and in a direction orthogonal to the axial direction. That is, the axial position of the ring portion 53 is determined by the contact surface where the side surface 54b of the ring position adjusting portion 54 and the inclined surface 58b come into contact, and the convex portion 54a of the ring position adjusting portion 54 is formed in the circular groove 62 of the support column 57. The position of the ring portion 53 in the direction orthogonal to the axial direction is determined at the fitting position.

  Attachment of the ring portion 53 to the inclined surface 58a is fixed by using the fastening member 61 after the ring portion 53 is positioned by the above-described method.

  The opening 55 of the ring portion 53 is larger than the outer diameter of the distal end portion 14 of the transition piece elbow 10. That is, the ring portion 53 has an inner diameter larger than the outer diameter of the tip portion 14 of the transition piece elbow 10, and the outer peripheral surface of the tip portion 14 of the transition piece elbow 10 in a state where the flange 13 is fixed to the base portion 52. An inspection-use annular gap G1 (see FIG. 10A) is formed between them.

At least the ring portion 53 is detachably provided to the base portion 52 via the support portion 56.
In some embodiments, the support column 57 is detachably fixed to the base portion 52 by a fastening member 59. Similarly, the ring portion 53 is detachably fixed to the support column 57 by the fastening member 61.

Next, a method of using the inspection jig 50 having the above configuration will be described. FIGS. 10A and 10B are diagrams showing a usage state of the inspection jig 50.
Although the inspection jig 50 is different in the configuration of the support portion 56 from the configuration of the support portion 30 of the inspection jig 20, the method of using the inspection jig 50 is the same as that of the inspection jig 20. That is, when inspecting the transition piece elbow 10 using the inspection jig 50, first, the flange 13 of the transition piece elbow 10 is fixed to the base portion 52 using the positioning bolt 46 and the positioning nut 48. In some embodiments, a positioning nut 48 is disposed in the recess 42 of the base portion 52, and the positioning nut 48 is positioned and fixed to the base portion 22 by the fixing member 45. In the embodiment shown in FIG. 10A, the fixing member 45 is a bolt that is screwed into a plurality of screw holes 44 provided in each recess 42. (Note that only one bolt 45 is shown in FIG. 10A, but in actuality, each of the plurality of screw holes 44 (see FIG. 9) provided in each recess 42 has a bolt 45. Is screwed in.)
Positioning bolts 46 inserted into the fastening holes 16 of the flange 13 and the clearance holes 40 of the base portion 52 are screwed into the positioning nuts 48 fixed to the base portion 52. In this way, the flange 13 of the transition piece elbow 10 is fixed to the base portion 52.

The positioning nut 48 is held at a predetermined position of the base portion 52 by the fixing member 45 without being affected by the hole diameter accuracy of the clearance hole 40 of the base portion 52. As a result, the position of the positioning bolt 46 screwed into the screw hole of the positioning nut 48 is also accurately determined. Further, the shaft portion 47 of the positioning bolt 48 has a larger diameter than the shaft portion of the fastening bolt 18, and the gap between the wall surface of the fastening hole 16 and the shaft portion 47 is relatively small. Therefore, the PCD 41 (see FIG. 9) of each fastening hole 16 coincides with a circular locus through which the center (nut center) of the screw hole of each positioning nut 48 passes.
Thus, the position of the flange 13 of the transition piece elbow 10 positioned by the positioning bolt 46 is accurately determined with respect to the base portion 52 without being affected by the hole diameter accuracy of the clearance hole 40 of the base portion 52.

On the other hand, the ring portion 53 of the inspection jig 50 is supported at a predetermined position by the support portion 56 with reference to the screw hole of the positioning nut 48 positioned by the fixing member 45 with respect to the base portion 52. That is, the position of the ring portion 53 supported on the base portion 52 by the support portion 56 is determined so that the center of the ring portion 53 has a predetermined relative positional relationship with the nut center of each positioning nut 48. ing. Here, the “predetermined relative positional relationship” refers to the mounting position of the base end portion 12 of the tail cylinder elbow 10 to the flange 6A on the tail cylinder (first pipe) 6 side, and the valve support pipe (first pipe). (2 piping) is a positional relationship according to the relative relationship with the mounting position of the tip end portion 14 of the transitional tube elbow 10 to 9.
Therefore, the relative position of the ring portion 53 with respect to the distal end portion 14 of the transition piece elbow 10 in the state where the flange 13 of the transition piece elbow 10 is attached to the base portion 52 is the same as when the transition piece elbow 10 is actually assembled to the transition piece 6. This corresponds to the relative position of the valve support pipe 9 with respect to the tip portion 14.

  Therefore, utilizing the annular gap G1 formed between the outer peripheral surface of the distal end portion 14 of the tail tube elbow 10 and the inner peripheral surface of the ring portion 53, the tail tube (first pipe) 6 and the valve support pipe (first It is possible to check whether the relative position of the distal end portion 14 with respect to the proximal end portion 12 of the transitional tube elbow 10 is within an allowable range. That is, the shape of the transition piece elbow 10 can be confirmed with reference to the base end portion 12 of the transition piece elbow 10 (more precisely, the PCD 41 of the fastening hole 16).

Further, in the inspection jig 50, similarly to the inspection jig 20, the fastening bolt 18 and the nut 19 for fastening the flange 13 to the tail cylinder 6 (first pipe) side are used, and the tail cylinder 6 (first It is also possible to perform an inspection from the viewpoint of whether the tail cylinder elbow 10 can be assembled to the pipe) and the valve support pipe (second pipe) 9.
In order to perform this inspection, as shown in FIG. 10B, the annular gap G2 between the outer peripheral surface of the distal end portion 14 of the transition piece elbow 10 and the inner peripheral surface of the ring portion 53 is maintained within an allowable range. On the other hand, it is determined whether the fastening to the base portion 52 of the flange 13 is possible using the fastening bolt 18 and the nut 19. Thereby, the flange 6A of the tail cylinder (first pipe) 6 of the base end part 12 of the tail cylinder elbow 10 in a state where the distal end portion 14 of the tail cylinder elbow 10 is actually connected to the valve support pipe (second pipe) 9. It is possible to check whether or not it is possible to conclude the connection. That is, using the tip 14 of the transition piece elbow 10 as a reference, inspecting whether the transition piece elbow 10 can be actually assembled to the transition piece (first pipe) 6 and the valve support pipe (second pipe) 9 is possible. Can do.

As described above, in the above-described embodiment, the relative positions of the ring portions 24 and 54 with respect to the mounting positions of the base end portion 12 of the tail tube elbow (curved pipe) 10 to the base portions 22 and 52 are the tail tube (first tube). 1 pipe) is determined according to the relative relationship between the attachment position of the base end portion 12 to the 6 and the attachment position of the distal end portion 14 to the valve support pipe (second piping) 9. That is, the relative positions of the ring portions 24 and 54 with respect to the distal end portion 14 of the tail tube elbow 10 in a state where the base end portion 12 of the tail tube elbow 10 is attached to the base portions 22 and 52 of the inspection jigs 20 and 50 are as follows. This corresponds to the relative position of the valve support pipe 9 with respect to the distal end portion 14 of the transition piece elbow 10 when the transition piece elbow 10 is actually assembled to the transition piece 6.
Therefore, when the base end portion 12 of the transition piece elbow 10 is attached to the base portions 22 and 52 of the inspection jigs 20 and 50, it is formed between the distal end portion 14 of the transition piece elbow 10 and the ring portions 24 and 54. The relative position of the distal end portion 14 with respect to the proximal end portion 12 of the tail tube elbow 10 is checked within a permissible range by using the annular gap G1 formed by the relationship between the flange 6A of the tail tube 6 and the valve support pipe 9. be able to. In other words, the shape of the transition piece elbow 10 can be confirmed with reference to the proximal end portion 12 of the transition piece elbow 10.

Here, in the combustor 1, the transition piece elbow 10 may experience a temperature change many times due to repeated start and stop of the gas turbine plant, which may lead to defects and damage to the transition piece elbow 10. Therefore, there is a case where the transition piece elbow 10 is detached from the combustor 1 and welding repair of the transition piece elbow 10 is desired. However, if the tail tube elbow 10 is repaired by welding, it becomes difficult to grasp the shape of the tail tube elbow 10 after the repair by welding influence. Therefore, when the defect / damage of the transition piece elbow 10 is within the acceptable standard, only the blending (removal of the defect by grinding the metal surface) is performed and the transition piece elbow 10 is reused, while the defect / damage is the acceptable standard. If it is outside, it is treated as impossible to repair, and it is realistic to replace it with a new tail cylinder elbow 10. However, in such correspondence, the effect of extending the life of the tail cylinder elbow 10 by repair cannot be expected, and the running cost of the gas turbine plant increases.
In this regard, if the inspection jigs 20 and 50 according to the above-described embodiment are used, it is possible to appropriately inspect the transition piece elbow 10 after welding repair. Therefore, the life extension effect of the tail cylinder elbow 10 by welding repair can be expected.

In the inspection jigs 20 and 50 according to the above-described embodiment, the shape of the tail tube elbow 10 can be confirmed in a state where the flange 13 of the tail tube elbow 10 is positioned by the positioning bolt 46. That is, in the inspection method using the annular gap G1 in the above-described embodiment, the shape of the tail cylinder elbow 10 is confirmed with reference to the flange 13 of the tail cylinder elbow 10 (more precisely, the PCD 41 of the fastening hole 16).
This is because there is a possibility that the inlay part 11 is also affected by the thermal distortion of the transition piece elbow 10 due to welding repair, so that the fastening hole 16 of the flange 13 that is not easily affected by thermal distortion due to welding repair is used as a reference. This is because the inspection regarding the shape of the transition piece elbow 10 is performed accurately.

  Next, a procedure for repairing and inspecting the transition piece elbow 10 using the inspection jigs 20 and 50 according to the above-described embodiment will be described.

  FIG. 11 is a flowchart showing work procedures for repair and inspection of the transition piece elbow 10.

  As shown in the figure, first, a positioning nut 48 is disposed in the recess 42 of the base portions 22 and 52 of the inspection jigs 20 and 50, and the positioning nut 48 is positioned on the base portions 22 and 52 by the fixing member 45 (see FIG. Step S2).

  In step S4, after the operation of the gas turbine plant, the transition piece elbow 10 removed from the combustor 1 is placed on the base portions 22 and 52. At this time, at least the ring portions 24 and 53 are removed from the base portions 22 and 52 of the inspection jigs 20 and 50 so that the setting to the base portions 22 and 52 of the tail tube elbow 10 can be easily performed.

  Subsequently, as shown in FIGS. 6A and 10A, positioning bolts 46 are inserted into the fastening holes 16 of the flange 13 of the tail cylinder elbow 10 and the clearance holes 40 of the base portions 22 and 52, thereby positioning. A positioning nut 48 is screwed to the front end side of the bolt 46, and the flange 13 is fixed to the base portions 22 and 52 (step S6). In this state, the ring portions 24 and 53 are attached to the base portions 22 and 52 via the support portions 30 and 56 in step S8.

In step S10, an annular gap G1 formed between the outer peripheral surface of the distal end portion 14 of the transition piece elbow 10 and the inner peripheral surfaces of the ring portions 24 and 53 is measured.
From the measurement result of the annular gap G1, the effects of thermal deformation, distortion, high temperature corrosion, etc. of the transition piece elbow 10 resulting from the operation of the gas turbine plant are estimated, and the welding repair contents of the transition piece elbow 10 are examined (step S12). ). In step S <b> 14, the transition piece elbow 10 is once removed from the inspection jigs 20 and 50, and welding repair is performed on the transition piece elbow 10.

And in order to investigate the influence of the thermal distortion at the time of welding repair, the test | inspection regarding the shape of the tail-tube elbow 10 using the inspection jigs 20 and 50 is performed again (steps S16 to S24).
Specifically, the positioning nut 48 is positioned on the base portions 22 and 52 by the fixing member 45 (step S16), and the tail pipe elbow 10 after welding repair is placed on the base portions 22 and 52 (step S18). The positioning bolt 46 is screwed onto the positioning nut 48 to fix the flange 13 to the base portions 22 and 52 (step S20). In this state, the ring portions 24 and 53 are attached to the base portions 22 and 52 via the support portions 30 and 56 (step S22), and the annular gap G1 between the tip portion 14 and the ring portions 24 and 53 is measured. It is confirmed whether the measured value is within the allowable range (step S24).
If the measured value of the annular gap G1 deviates from the allowable range in step S24, the welding repair of the transition piece elbow 10 is performed again, and steps S12 to S24 are performed until the measured value falls within the allowable range. It may be repeated.

Further, using the inspection jigs 20 and 50, an inspection is performed from the viewpoint of whether or not the tail cylinder elbow 10 after welding repair can be assembled to the tail cylinder 6 and the valve support pipe 9 (steps S26 to S28).
Specifically, the positioning bolt 46 and the positioning nut 48 are removed from the inspection jigs 20 and 50 (step S26), and the annular gap G2 between the tip portion 14 and the ring portions 24 and 53 is maintained within the control range. However, it is confirmed whether the flange 13 using the fastening bolt 18 and the nut 19 can be fastened to the base portions 22 and 52 (step S28).
If the flange 13 cannot be fastened to the base portions 22 and 52 in step S28, the tail pipe elbow 10 is repaired by welding again until the flange 13 can be fastened to the base portions 22 and 52. S12 to S28 may be repeated.

  As mentioned above, although embodiment of this invention was described in detail, it cannot be overemphasized that this invention is not limited to this, In the range which does not deviate from the summary of this invention, various improvement and deformation | transformation may be performed.

  For example, in the inspection jigs 20 and 50 according to the above-described embodiment, the first inspection relating to the shape of the tail cylinder elbow 10 with the base end portion 12 as a reference and the set of the tail cylinder elbow 10 with the tip portion 14 as a reference This is for performing both of the second inspection concerning the possibility of attachment. Therefore, in the inspection jigs 20 and 50, a clearance hole 40 imitating the clearance hole 17 of the flange 6A of the tail tube 6 is provided in the base portions 22 and 52 in order to perform the second inspection, and the first inspection is performed. For this purpose, a positioning nut 48 and a fixing member 45 for positioning the positioning nut 48 on the base portions 22 and 52 are provided.

  However, in other embodiments, when the first inspection and the second inspection are performed by separate inspection jigs, the configuration around the fastening portion with the flange 13 of the inspection jig for performing each inspection is mutually different. It may be different.

FIG. 12A is a cross-sectional view showing a configuration around the fastening portion with the flange 13 of the inspection jig for performing the first inspection, and FIG. 12B is an inspection treatment for performing the second inspection. It is sectional drawing which shows the structure of the fastening part periphery with the flange 13 of a tool.
Since the inspection jig here is the same as the inspection jigs 20 and 50 except for the configuration around the fastening portion with the flange 13, only the configuration around the fastening portion with the flange 13 will be described below. To do.

In the inspection jig for performing the first inspection, as shown in FIG. 12A, the screw holes 62 formed with the internal threads to be engaged with the external threads on the distal end side of the positioning bolts 46 are formed in the base portions 22 and 52. Is provided. Therefore, the position of the positioning bolt 46 screwed into the screw hole 62 is accurately determined with respect to the base portions 22 and 52. Further, the shaft portion 47 of the positioning bolt 48 has a larger diameter than the shaft portion of the fastening bolt 18, and the gap between the wall surface of the fastening hole 16 and the shaft portion 47 is relatively small. Therefore, the PCD 41 of each fastening hole 16 coincides with a circular locus through which the centers of the screw holes 62 of the base portions 22 and 52 pass. Thus, the position of the flange 13 of the transition piece elbow 10 positioned by the positioning bolt 46 is accurately determined with respect to the base portion 52.
In the inspection jig for performing the first inspection, the ring portions 24 and 53 are supported by the support portions 30 and 56 at predetermined positions with reference to the screw holes 62 of the base portions 22 and 52. Here, the “predetermined relative positional relationship” refers to the mounting position of the base end portion 12 of the tail cylinder elbow 10 to the flange 6A on the tail cylinder (first pipe) 6 side, and the valve support pipe (first pipe). (2 piping) is a positional relationship according to the relative relationship with the mounting position of the tip end portion 14 of the transitional tube elbow 10 to 9.
Therefore, the relative positions of the ring portions 24 and 53 with respect to the tip end portion 14 of the tail tube elbow 10 in a state where the flange 13 of the tail tube elbow 10 is attached to the base portions 22 and 52 are as follows. This corresponds to the relative position of the valve support pipe 9 with respect to the distal end portion 14 when assembled. Therefore, utilizing the annular gap G1 formed between the outer peripheral surface of the distal end portion 14 of the transition piece elbow 10 and the inner peripheral surface of the ring portion 53, the transition piece (first pipe) 6 and the valve support pipe (first order) It is possible to check whether the relative position of the distal end portion 14 with respect to the proximal end portion 12 of the transitional tube elbow 10 is within an allowable range. That is, the shape of the transition piece elbow 10 can be confirmed with reference to the base end portion 12 of the transition piece elbow 10 (more precisely, the PCD 41 of the fastening hole 16).

In the inspection jig for performing the second inspection, a clearance hole 64 simulating the clearance hole 17 of the flange 6A of the tail cylinder 6 is provided in the base portions 22 and 52 as shown in FIG. . Therefore, using a fastening bolt 18 and a nut 19 for fastening the flange 13 to the tail tube 6 (first piping) side, the tail tube to the tail tube 6 (first piping) and the valve support piping (second piping) 9 is used. An inspection from the viewpoint of whether the elbow 10 can be assembled can also be performed.
In order to perform the second inspection, the fastening bolt 18 and the nut 19 are set while maintaining the annular gap G2 between the outer peripheral surface of the tip end portion 14 of the transition piece elbow 10 and the inner peripheral surface of the ring portion 53 within an allowable range. It is used to determine whether the flange 13 can be fastened to the base portions 22 and 52. Thereby, the flange 6A of the tail cylinder (first pipe) 6 of the base end part 12 of the tail cylinder elbow 10 in a state where the distal end portion 14 of the tail cylinder elbow 10 is actually connected to the valve support pipe (second pipe) 9. It is possible to check whether or not it is possible to conclude the connection. That is, using the tip 14 of the transition piece elbow 10 as a reference, inspecting whether the transition piece elbow 10 can be actually assembled to the transition piece (first pipe) 6 and the valve support pipe (second pipe) 9 is possible. Can do.

1 Gas turbine combustor (combustor)
2 Cabin 3 Combustion nozzle 3A Pilot nozzle 3B Main nozzle 4 Inner cylinder 6 Tail (first pipe)
6A Flange 7 Bypass duct 8 Bypass valve 9 Valve support piping (second piping)
DESCRIPTION OF SYMBOLS 10 Cylinder elbow 11 Inlay part 12 Base end part 13 Flange 14 Tip part 15 Protrusion 16 Fastening hole 17 Clearance hole 18 Fastening bolt 19 Nut 20 Inspection jig 22 Base part 24 Ring part 25 Opening 26 Taper pin 27 Male screw 28 Nut 30 Support portion 32 Support plate 33 Inclined surface 34 Pin 36 Fastening member 40 Clearance hole 42 Recessed portion 44 Screw hole 45 Fixing member 46 Positioning bolt 47 Shaft portion 48 Positioning nut 50 Inspection jig 52 Base portion 53 Ring portion 54 Ring position adjusting portion 55 Opening 56 Support portion 57 Support column 58 Inclined surface 59 Fastening member 61 Fastening member

Claims (9)

A bent pipe used for connection between the first pipe and the second pipe is inspected, having a base end part provided with a flange for fastening to the first pipe and a tip part attached to the second pipe. A jig for
A base portion configured to fix the base end portion of the bent pipe by fastening with the flange;
A ring portion having an inner diameter larger than an outer diameter of the distal end portion of the bent pipe, and forming an annular gap for inspection between the outer peripheral surface of the distal end portion and surrounding the distal end portion;
According to the relative relationship between the attachment position of the base end portion to the first pipe and the attachment position of the tip end portion to the second pipe, the ring portion with respect to the attachment position of the base end portion to the base portion A bending pipe inspection jig comprising: a support portion configured to support the ring portion on the base portion so that a relative position is determined. The base portion is provided with a plurality of clearance holes corresponding to the plurality of fastening holes provided in the flange,
A plurality of positioning nuts provided on the opposite side of the mounting surface of the flange of the base portion corresponding to each clearance hole,
A fixing member for fixing each positioning nut to the opposite side of the mounting surface of the flange of the base part;
A plurality of positioning members having an outer diameter that can be fitted into the fastening holes, inserted into the fastening holes and the clearance holes, and screwed to the positioning nuts fixed to the base portion by the fixing members. A bolt and
The position of the ring portion supported by the support portion is determined based on the position of the screw hole into which the positioning bolt of each positioning nut is screwed in a state where the fixing nut is fixed to the base portion by the fixing member. An inspection jig for bent piping according to claim 1. The support part includes a pair of support plates erected on the base part along the bent pipe on both sides of the bent pipe in a state where the flange is fastened to the base part.
Each support plate has an inclined surface inclined with respect to the base portion according to an angle formed by the distal end portion of the bent pipe with respect to the base end portion,
The said ring part is attached to the said inclined surface of each support plate so that it may span between a pair of said support plates, The jig | tool for the inspection of bent piping of Claim 1 characterized by the above-mentioned. The support part includes a support column erected on the base part on the tip part side of the bent pipe in a state where the flange is fastened to the base part,
The support column has an inclined surface inclined with respect to the base portion according to an angle formed by the distal end portion of the bent pipe with respect to the base end portion,
The bending ring inspection jig according to claim 1, wherein the ring portion is attached to the inclined surface of the support column.   The bending pipe inspection jig according to claim 1, wherein at least the ring part is configured to be detachable from the base part. Inspection of a bent pipe having a base end portion provided with a flange for fastening to the first pipe and a tip end portion attached to the second pipe and used for connection between the first pipe and the second pipe A method,
A base portion, a ring portion having an inner diameter larger than the outer diameter of the distal end portion of the bent pipe, an attachment position of the base end portion to the first pipe, and an attachment position of the distal end portion to the second pipe A support portion configured to support the ring portion on the base portion such that a relative position of the ring portion with respect to a mounting position of the base end portion to the base portion is determined in accordance with a relative relationship between A first determination step of determining whether a relative position of the distal end portion with respect to the base end portion of the bent pipe is within an allowable range using an inspection jig including:
In the first determination step, an outer peripheral surface of the distal end portion of the bent pipe and the ring in a state where the base end portion of the bent pipe is fixed to the base portion of the inspection jig by fastening with the flange. A method for inspecting a bent pipe, comprising: determining whether a relative position of the distal end portion with respect to the base end portion is within an allowable range based on an annular gap formed between the inner peripheral surface of the portion and the inner peripheral surface.   The flange can be fastened to the base portion while maintaining an annular gap having an allowable size between the outer peripheral surface of the tip and the inner peripheral surface of the ring portion. A second determination step of determining whether or not the flange can be fastened to the first pipe in a state where the tip of the bent pipe is attached to the second pipe. The bent pipe inspection method according to claim 6, further comprising: The base portion is provided with a plurality of clearance holes corresponding to the plurality of fastening holes provided in the flange,
Corresponding to each clearance hole, fixing a plurality of positioning nuts on the opposite side of the flange mounting surface of the base portion;
Inserting a positioning bolt having an outer diameter that can be fitted into the fastening hole into the fastening hole and the clearance hole, and screwing the positioning bolt onto the positioning nut fixed to the base portion; Prepared,
The position of the ring portion supported by the support portion is determined based on the position of the screw hole into which the positioning bolt of each positioning nut is screwed in the state where the inspection jig is fixed to the base portion. ,
In the first determination step, it is determined whether the relative position is within the allowable range in a state where the positioning bolt is screwed onto the positioning nut and the flange is fastened to the base portion. Item 7. An inspection method for bent piping according to Item 6. The flange can be fastened to the base portion while maintaining an annular gap having an allowable size between the outer peripheral surface of the tip and the inner peripheral surface of the ring portion. A second determination step of determining whether or not the flange can be fastened to the first pipe in a state where the tip of the bent pipe is attached to the second pipe. Prepared,
The said 2nd determination step judges whether the fastening to the said base part of the said flange is possible using the fastening bolt for fastening the said flange to the said 1st piping. Inspection method for bent piping as described in 1.

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