JP6574747B2 - Method for investigating flues or chimneys - Google Patents

Description

  The present invention relates to a method for investigating a flue or chimney, and more particularly, to a method for investigating a flue or chimney in which a flue structure is investigated using an infrared thermography apparatus.

  The flue or chimney, which is a structure through which high-temperature smoke or gas passes, is a flue gas flow path for sending flue gas from a coke oven toward the chimney outlet in a plant equipped with blast furnace equipment, for example. The combustion exhaust gas that circulates is in a high temperature state of about 200 to 300 ° C., for example. For this reason, the flue or chimney structure that constitutes the flue or chimney is, for example, a double body composed of a main body formed using firebrick and an outer peripheral concrete casing that covers the main body and is constructed on the outer peripheral portion. It is formed so as to have a structure, and a buffer space is provided between the main body and the outer peripheral concrete frame so that the temperature of the flowing high-temperature combustion exhaust gas is not transmitted to the outside of the flue or chimney structure. The idea to make is made.

  Some of these flues or chimney structures have been aged, for example, over several decades since they were constructed. In particular, the buffer space of the flues or chimney structures is hot and narrow. Because of the space, it is difficult to investigate deformation. For this reason, when significant deformation is confirmed on the inner surface of the outer peripheral concrete frame facing the buffer space, there are many cases that hinder the operation. Therefore, it is important to investigate and establish diagnostic technology in high temperature and narrow space.

  In addition, in order to investigate the situation inside the flue or chimney structure, it is necessary to stop the operation of the blast furnace equipment, etc., and to conduct the investigation. It takes a lot of time and labor, and the operating efficiency is lowered and a great loss is incurred. For this reason, there is a demand for the development of a technology that makes it possible to investigate the internal conditions of these flues or chimney structures while the flues and chimneys are in operation.

  On the other hand, an investigation method (deformation part detection method) that makes it possible to detect deformations caused by floating, peeling, etc. in the surface layer of concrete in a non-contact manner by an infrared method using an infrared thermography device. Has been developed (see, for example, Patent Document 1). In the investigation method described in Patent Document 1, when the surface layer portion of the concrete is heated by sunshine or the like, if the surface layer portion of the concrete floats and peels, the air layer on the back side becomes a heat insulating layer, This utilizes the fact that a temperature difference occurs in the surface temperature of concrete. In other words, when such a temperature difference occurs, if a concrete surface is photographed using an infrared thermography device, a unique temperature distribution indicating the temperature difference appears in the thermal image, and such a unique temperature difference appears. The deformed portion generated in the surface layer portion of the concrete can be objectively specified through the temperature distribution.

JP 2011-99687 A

  By using an infrared thermography device, it is considered possible to investigate the condition of the inner peripheral surface of the flue or chimney structure facing the buffer space of the outer peripheral concrete frame while the flue or chimney is in operation. However, it is difficult to allow sunlight to reach the inner peripheral surface facing the buffer space of the outer peripheral concrete frame, and the buffer space is affected by the high-temperature combustion exhaust gas that circulates inside the main part of the flue and chimney. For example, since it is in a state of being constantly held at a high temperature of about 70 to 100 ° C., in consideration of the characteristics of the buffer space under such circumstances, the infrared thermography device is used to buffer the outer peripheral concrete frame. Development of a technology that enables easy investigation of the situation of the inner peripheral surface facing the space is desired.

  The present invention relates to the situation of the inner peripheral surface facing the buffer space of the outer peripheral concrete frame constructed on the outer peripheral portion of the chimney and the chimney by covering the main part of the chimney and the chimney with the buffer space interposed therebetween. An object is to provide a method for investigating a flue or chimney that can be easily investigated while operating.

  The present invention relates to a flue or chimney structure comprising a main body portion of a flue or chimney, and a peripheral concrete frame constructed on the outer peripheral portion so as to cover the main body portion with a buffer space interposed therebetween. In an object, a method for investigating a flue or chimney for investigating the state of the inner peripheral surface facing the buffer space of the outer peripheral concrete frame using an infrared thermography device while operating the flue or chimney, Penetrating from the outer peripheral surface of the outer peripheral concrete frame toward the buffer space, forming at least two investigation holes, and once closing the formed investigation holes, opening the selected investigation holes, The infrared thermography device is inserted into the buffer space through the opened research hole, and the temperature inside the buffer space is increased by outside air flowing into the buffer space from the opened research hole. A flue for investigating the condition of the inner peripheral surface of the outer peripheral concrete frame by grasping the change in the temperature of the inner peripheral surface of the outer peripheral concrete frame from the image obtained by the infrared camera of the infrared thermography device Alternatively, the above object is achieved by providing a chimney investigation method.

  And it is preferable that the said main-body part is formed using the firebrick in the investigation method of the flue or chimney of this invention.

  Further, in the flue or chimney investigation method of the present invention, the infrared thermography device is provided with a visible camera, the light source device is inserted into the selected examination hole, and the visible space is illuminated, and the visible space is illuminated. It is preferable to investigate the state of the inner peripheral surface of the outer peripheral concrete frame also from an image obtained by a camera.

  Furthermore, in the method for investigating a flue or chimney according to the present invention, the infrared thermography device is inserted into the buffer space in a state where the infrared thermography device is housed in the housing portion of a protective body including a housing portion and a tubular body portion. The state of the inner peripheral surface of the outer peripheral concrete frame is investigated by the image by the infrared camera and / or the visible camera while sending cool air to the casing through the pipe body. It is preferable.

  According to the method for investigating a chimney or chimney of the present invention, the inner periphery facing the buffer space of the outer peripheral concrete frame constructed on the outer peripheral part of the chimney or chimney by covering the main body part with the buffer space interposed The surface condition can be easily investigated while the flue and chimney are in operation.

It is sectional drawing which shows typically the flue structure investigated by the investigation method of the flue or chimney which concerns on preferable one Embodiment of this invention. (A) is a figure which shows the imaging unit used for the flue or chimney investigation method of preferable one Embodiment of this invention, (b) is a perspective view of the housing | casing part in which the infrared thermography apparatus was accommodated, (c) ) Is a perspective view of an infrared thermography apparatus housed in a casing. It is sectional drawing which shows typically the state which formed the drilling hole in the ceiling part of the outer periphery concrete frame of the flue structure shown in FIG. It is sectional drawing which shows typically the state which once closed the investigation hole formed in the flue structure shown in FIG. It is sectional drawing which shows typically the state which inserted the insertion imaging device in the investigation hole formed in the ceiling part of the outer periphery concrete frame of the flue structure shown in FIG. It is sectional drawing which shows typically the state which inserted the insertion imaging device and the light source device in the investigation hole formed in the ceiling part of the outer periphery concrete frame of the flue structure shown in FIG. It is sectional drawing which shows typically the state which inserted the imaging device into the investigation hole formed in the side wall part of an outer periphery concrete frame. It is sectional drawing which shows typically the state which inserted the insertion imaging device into the other investigation hole formed in the ceiling part of a perimeter concrete frame. (A) is a figure which illustrates the image image | photographed with the infrared camera of the infrared thermography apparatus shown in FIG. 2, (b) is a figure which illustrates the image image | photographed with the visible camera of the infrared thermography apparatus. (A) is a figure which illustrates the image image | photographed with the infrared camera of the infrared thermography apparatus shown in FIG. 2, (b) is a figure which illustrates the image image | photographed with the visible camera of the infrared thermography apparatus.

  A method for investigating a flue or chimney according to a preferred embodiment of the present invention shown in FIGS. 1 to 10 includes, for example, a buffer space 30 interposed between the flue main body 20 and the flue main body 20. The outer peripheral concrete housing 40 is constructed on the outer peripheral portion of the flue body portion 20 so as to cover the flue main body portion 20. For example, in the flue structure 10 extending from the coke oven toward the chimney, the outer concrete concrete housing 40 is buffered. It is used as a method for investigating the situation of the inner peripheral surface 40a facing the space 30. In the method for investigating a flue or chimney according to the present embodiment, once the operation of the flue 12 is stopped and the investigation is performed, a lot of time and labor are required until the flue 12 is restarted. In particular, the flue structure 10 can be operated while the flue 12 is in operation before the full-scale repair of the flue structure 10 or the like. This is employed as a method for knowing in advance the situation of the inner peripheral surface 40a of the outer peripheral concrete frame 40.

  In the flue or chimney investigation method of this embodiment, as shown in FIG. 3, at least two investigation holes (for example, investigation holes 44 a and 45 a) from the outer peripheral surface 40 b of the outer peripheral concrete frame 40 toward the buffer space 30. A thermal image of the inner peripheral surface 40a of the outer peripheral concrete frame 40 when the internal temperature of the buffer space 30 is lowered by the outside air flowing in through the inspection holes 44a and 45a (FIG. 9A and FIG. 10 (a)) as shown in FIG. 5, the state of the inner peripheral surface 40a of the outer peripheral concrete frame 40 can be easily grasped in advance while the flue 12 is in operation by photographing with the infrared thermography device 53. It can be so.

  And as shown in FIGS. 1-5, the investigation method of the flue or chimney of this embodiment is a flue or a chimney structure, for example, between the flue main-body part 20 and the flue main-body part 20. In the flue structure 10 including the outer peripheral concrete housing 40 constructed on the outer peripheral portion so as to cover the flue main body portion 20 with the buffer space 30 interposed therebetween, the inner peripheral surface of the outer peripheral concrete housing 40 facing the buffer space 30 40a is an investigation method for investigating the situation of 40a using the infrared thermography device 53 (see FIGS. 2A to 2C) while the flue 12 is in operation, and is buffered from the outer peripheral surface 40b of the outer peripheral concrete frame 40. After penetrating toward the space 30, at least two investigation holes 44 a and 45 a are formed by drilling (see FIG. 3), the formed investigation holes 44 a and 45 a are once closed, and then the selected investigation holes 44 a and 45 a are selected. The infrared thermography device 53 is inserted into the buffer space 30 through the opened survey holes 44a and 45a (see FIG. 5), and the buffer space is opened by the outside air flowing into the buffer space 30 from the opened survey holes 44a and 45a. An image obtained by the infrared camera 54 of the infrared thermography device 53 (see FIGS. 9A and 10A) shows the change in the temperature of the inner peripheral surface 40a of the outer peripheral concrete frame 40 when the temperature inside 30 decreases. ), The situation of the inner peripheral surface 40a of the outer peripheral concrete frame 40 is investigated.

  In the chimney flue inspection method of this embodiment or as shown in FIG. 2 (b) and FIG. 2 (c), the infrared thermography device 53 includes a visible camera 55, as shown in FIG. From the images (FIGS. 9B and 10B) obtained by the visible camera 55 in a state where the light source device 60 is inserted into the selected inspection hole 44a and the buffer space 30 is illuminated, the outer peripheral concrete frame is also obtained. The situation of 40 inner peripheral surfaces 40a is investigated.

  Furthermore, in the method for investigating a flue or chimney according to this embodiment, the infrared thermography device 53 includes a housing part 57 of a heat-resistant protective body 56 (see FIG. 2A) including a housing part 57 and a tube part 58. 2 (see FIG. 2B), the infrared camera 54 and / or the infrared camera 54 are inserted into the buffer space 30 while supplying cool air to the housing portion 57 via the tubular body portion 58. Alternatively, the state of the inner peripheral surface 40a of the outer peripheral concrete frame 40 is examined by images (see FIGS. 9A and 9B and FIGS. 10A and 10B) obtained by the visible camera 55.

  In the present embodiment, the flue body 20 is formed by stacking a plurality of refractory bricks 21 in an arch shape on the concrete floor slab 11 and filling the gaps with mortar as shown in FIG. The inside of the flue body 20 formed in an arch shape with a plurality of refractory bricks 21 constitutes a flue 12 through which combustion exhaust gas discharged from a coke oven or the like circulates. In addition, the flue 12 here means the space which distribute | circulates combustion exhaust gas etc.

  The flue body 20 has an inner diameter (width between the inner peripheral surfaces 20a) W of the lower part (concrete floor slab 11 side) of about 2150 mm, a height H from the concrete floor slab 11 to the inner peripheral surface 20a of about 3300 mm, and a thickness. The length t is formed in a size of about 230 mm, and is continuously formed in the extending direction toward a chimney (not shown). Moreover, since the internal temperature becomes about 200-300 degreeC in the state (state in which the flue 12 is working) in the state where the high-temperature combustion exhaust gas is distribute | circulating, the flue body part 20 has heat-resistant temperature. It is formed to be about 1300 ° C.

  The outer peripheral concrete housing 40 is provided with a buffer space 30 between the outer peripheral surface 20b of the flue main body 20 and covers the outer peripheral surface 20b of the flue main body 20 so as to cover the outer peripheral portion of the flue main body 20. Has been built. The buffer space 30 interposed between the outer peripheral surface 20b of the flue body 20 and the inner peripheral surface 40a of the outer peripheral concrete frame 40 is a gap of about 50 to 300 mm. Since the buffer space 30 is interposed, deterioration of the outer peripheral concrete housing 40 due to the high temperature inside the flue body 20 due to the distribution of the combustion exhaust gas can be effectively suppressed. . In the present embodiment, the buffer space 30 is a gap of about 50 mm in the lower part and the vicinity of the top part of the flue body 20 and about 200 to 300 mm obliquely above the flue body 20.

  The outer peripheral concrete frame 40 is formed of reinforced concrete, and is constructed so that the cross-sectional shape having a ceiling portion 41 and a pair of side wall portions 42 and 43 is substantially U-shaped. The ceiling portion 41 is formed to a thickness of about 500 mm, and the top surface 41b is formed in a flat shape so that a worker can walk on it (on the outer peripheral surface 41b). The inner peripheral surface 41 a of the ceiling portion 41 is formed in a concave shape corresponding to the shape of the outer peripheral surface 20 b of the flue main body portion 20 formed in an arch shape, and the buffer space 30 obliquely above the flue main body portion 20. Does not become too large. Specifically, the shape of the inner peripheral surface 41a of the ceiling portion 41 is such that the central portion facing the top portion of the flue body portion 20 is formed in a horizontal plane shape substantially parallel to the top surface 41b, and the oblique upper portion of the flue body portion 20 Both side portions opposed to each other are formed in an inclined surface shape that slopes downward toward both sides in the width direction. The pair of side wall portions 42 and 43 are erected on the concrete slab 11 and are formed to a thickness of about 400 mm. The pair of side wall portions 42 and 43 are disposed on both sides of the flue body 20 so that a gap (the length in the width direction of the buffer space 30) with the flue body 20 is about 50 mm. .

  In the present embodiment, the state of the inner peripheral surface 40 a facing the buffer space 30 of the outer peripheral concrete frame 40 is imaged by the infrared thermography device 53 of the imaging unit 50. As illustrated in FIG. 2A, the imaging unit 50 includes an insertion imaging unit 51 that is inserted into the buffer space 30 and images the inner peripheral surface 40 a of the outer peripheral concrete frame 40, and an operation unit 52 that operates the insertion imaging unit 51. The insertion imaging unit 51 is inserted into the buffer space 30 through a survey hole formed in the outer peripheral concrete frame 40, and a thermal image is captured by operating the insertion imaging unit 51 with the operation unit 52. To do.

  The insertion imaging unit 51 includes an infrared thermography device 53 (see FIG. 2C) that captures a thermal image and a visible image, and a heat-resistant protective body 56 (see FIG. 2B) that houses the infrared thermography device 53 and the like. By having the infrared thermography device 53 accommodated in the heat-resistant protective body 56, for example, the buffer space 30 has a high temperature of, for example, about 80 ° C. due to the high-temperature combustion exhaust gas flowing through the flue 12 of the flue body 20. Even in this case, the infrared thermography device 53 can be used without causing a failure.

  The infrared thermography device 53 includes an infrared camera 54 that captures a thermal image of the surface temperature of the inner peripheral surface 40a of the outer peripheral concrete housing 40, and a visible camera 55 that captures a visible state of the inner peripheral surface 40a of the outer peripheral concrete housing 40. Thus, the infrared camera 54 and the visible camera 55 are accommodated in one substantially rectangular parallelepiped casing 53a in the same imaging direction. By taking a thermal image of the inner peripheral surface 40a of the outer peripheral concrete frame 40 with the infrared camera 54, it becomes possible to grasp a damaged part such as peeling or floating of the inner peripheral surface 40a of the outer peripheral concrete frame 40 as a low temperature part. . Further, by taking an image with the visible camera 55, for example, it becomes possible to confirm the low temperature part confirmed by the thermal image with the visible image, and damage such as peeling or floating at the part judged as the low temperature part by the thermal image. It becomes possible to investigate more carefully whether or not this has occurred. As a result, the accuracy of the situation investigation on the inner peripheral surface 40a of the outer peripheral concrete frame 40 can be improved. In the present embodiment, since imaging is performed in the buffer space 30 having the above-described size, a substantially rectangular parallelepiped shape having a length in the longitudinal direction (imaging direction) of about 60 mm and a length of about 40 mm in length and width is about. An infrared thermography device 53 is used.

  The infrared camera 54 can measure infrared rays (thermal infrared rays) having a wavelength of, for example, about 7.5 to 13 μm, and the inner peripheral surface of the outer peripheral concrete frame 40 described above in the buffer space 30 having the above-described size. Since 40a is imaged, the focal length is set to about 80 cm, for example. Note that the focal length is not limited to 80 cm and is preferably changed based on the imaging location. For example, when using an infrared camera whose focal length can be adjusted by remote control, it is preferable to change the focal length as appropriate according to the imaging location. Similar to the infrared camera 54, the visible camera 55 has a focal length of, for example, about 80 cm. When a visible camera whose focal length can be adjusted by remote control is used, the focal length is appropriately changed according to the imaging location. It is preferable to do.

  As shown in FIGS. 2A and 2B, the heat-resistant protective body 56 includes a housing portion 57 that houses the infrared thermography device 53 and a tubular body portion 58 that is connected to the housing portion 57. It is out. A thermocouple (not shown) is arranged in the casing portion 57 via the tube portion 58, and cold air is supplied to the casing portion 57 via the tube portion 58 in accordance with the temperature measured by the thermocouple. It is supposed to be sent. The cool air is sent into the housing 57 through the tubular body 58, whereby the internal temperature of the housing 57 is prevented from rising due to the ambient temperature of the buffer space 30. The casing 57 is formed so as to be able to accommodate the infrared thermography device 53 in a state where a connection cable or the like is connected. In the present embodiment, the length in the longitudinal direction is about 120 mm, and the length in the vertical and horizontal directions is about 60 mm. It is formed in a substantially rectangular parallelepiped shape. The tube part 58 is connected to the upper surface 57a of the casing part 57, in which the connection cable of the infrared thermography device 53 accommodated in the casing part 57, the above-described thermocouple, and the like are arranged. Cold air can be sent to the body 57. In the present embodiment, a tubular body 58 having a diameter of 60 mm and a length of 1000 mm is used.

  Further, the heat-resistant protective body 56 is covered with a heat-resistant sheet 59, and when it is inserted into the buffer space 30, an increase in internal temperature is reduced. The heat-resistant sheet 59 may cover the entire heat-resistant protective body 56, or may cover the entire housing part 57 and a part of the tube part 58. For example, it is preferable to cover about 2/3 of the entire housing portion 57 and the tube portion 58. As the heat-resistant sheet 59, for example, a trade name “INSULTEX tape” (manufactured by NICHIAS CORPORATION) or the like can be used.

  The operation unit 52 includes an operation unit main body 52a for operating the infrared thermography device 53, and a monitor (not shown) that displays a thermal image and a visible image captured by the infrared thermography device 53. The operator projects the image on the monitor. While viewing the thermal image or visible image, the operator holding the insertion imaging unit 51 is instructed in the imaging direction of the infrared thermography device 53, and imaging is performed by the operation unit main body 52a. In the present embodiment, the operation unit main body 52 a can capture moving images and still images with the infrared camera 54 and the visible camera 55. As the operation unit 52, a personal computer in which an operation program of the infrared thermography device 53 is installed can be used.

  The method for investigating a flue or chimney according to the present embodiment is as described above with respect to the state of the inner peripheral surface 40a facing the buffer space 30 of the outer peripheral concrete case 40 of the flue structure 10 shown in FIG. An investigation is made using the imaging unit 50 shown in FIG. Specifically, in order to carry out the investigation method of the present embodiment, first, in the ceiling portion 41 of the outer peripheral concrete frame 40 in which at least two investigation holes are formed, a buried object such as a reinforcing bar is searched for, Check where there are no buried objects. In addition, although the two investigation holes 44a and 45a are core-drilled here, two or more investigation holes may be core-drilled. The number of survey holes is preferably set as appropriate according to the size and shape of the flue structure 10 (for example, the size and shape of the buffer space). Further, the core drilling of the outer peripheral concrete case 40 means that the outer peripheral concrete case 40 is cut out from the outer peripheral surface 41 b of the outer peripheral concrete case 40 toward the buffer space 30.

  When a place where there is no buried object such as a reinforcing bar in the ceiling 41 is confirmed by investigating the buried object, for example, two places to be drilled in the ceiling 41 are determined. In the present embodiment, as shown in FIG. 3, the inspection hole 44 a is core drilled at a position facing the top of the flue body 20, and in the width direction (direction orthogonal to the extending direction) with the inspection hole 44 a. The inspection hole 45a is core drilled at a position that is a predetermined distance apart. Further, in the present embodiment, the investigation holes 44a and 45a are core drilled so that the diameter is about 200 mm (φ200). By drilling the core at the two survey holes 44a and 45a, it becomes easy for outside air to flow into the buffer space 30 from the survey holes 44a and 45a, and the temperature inside the buffer space 30 can be effectively reduced. Become.

  When the two core drilling holes for the ceiling portion 41 are completed, as shown in FIG. 4, the closing pipes 4a and 47 are inserted into the two drilling hole 44a and 45a, and the survey holes 44a and 45a are formed. Once blocked. By temporarily closing the survey holes 44a and 45a, the temperature of the buffer space 30 can be returned to the temperature before core drilling. The closing pipes 46 and 47 for closing the investigation holes 44a and 45a are sealed with bottom plates 46c and 47c at the lower ends, and rectangular lids 46a and 47a are connected to the upper ends and have a diameter of about 165 mm (φ165). It consists of bodies 46b and 47b and is prepared in advance. The pipe bodies 46b and 47b are covered with a heat insulating tape, and an insertion hole (not shown) through which a fixing anchor (not shown) for fixing to the ceiling portion 41 is inserted is formed in the rectangular lid bodies 46a and 47a. . The closing pipes 46 and 47 are configured such that the lid bodies 46 a and 47 a are fixed to the ceiling portion 41 via a fixed anchor (not shown).

  Once the inspection holes 44a and 45a are closed, the imaging unit 50 is prepared. The thermal imaging by the imaging unit 50 requires two workers, the first operator operates the insertion imaging unit 51 inserted into the investigation hole 45a, and the second worker operates the operation unit 52. While operating the operation unit main body 52a, the first operator is instructed of the imaging position by the insertion imaging unit 51 while looking at the monitor.

  After the imaging unit 50 is prepared, the selected investigation holes (in this embodiment, two investigation holes 44a and 45a) are opened again, and the outside air flows into the buffer space 30 from the two investigation holes 44a and 45a. Let When outside air flows into the buffer space 30 from the two investigation holes 44a and 45a, the temperature inside the buffer space 30 decreases. Then, as shown in FIG. 5, the first worker inserts the insertion imaging unit 51 into the survey hole 45 a and takes the thermal image of the inner peripheral surface 41 a of the ceiling portion 41 of the outer peripheral concrete frame 40 with the infrared camera 54. To do. For example, while the second worker watches the thermal image displayed on the monitor, the first worker who holds the insertion imaging unit 51 is instructed in the imaging direction of the infrared camera 54, and imaging is performed by the operation unit main body 52a.

  At this time, when there is a damaged portion such as peeling or floating on the inner peripheral surface 40a of the outer peripheral concrete housing 40, the air layer on the back side of the peeling or floating portion plays a role as a heat insulating material. The movement of heat from the outer circumferential surface 40b toward the inner circumferential surface 40a (the movement of heat from the higher temperature heat toward the lower temperature) is blocked, and the damaged portion appears as a low temperature part (see FIG. 9A). On the other hand, when there is no damage in the outer peripheral concrete frame 40, as shown in FIG. 10 (a), the movement of heat from the outer peripheral surface 40b of the outer peripheral concrete frame 40 toward the inner peripheral surface 40a (from higher temperature to lower temperature). Due to the moving heat), a remarkable low temperature portion does not appear on the inner peripheral surface 40a. In this way, by imaging the inner peripheral surface 40a of the outer peripheral concrete frame 40 with the infrared camera 54, the situation such as the damaged portion of the inner peripheral surface 40a of the outer peripheral concrete frame 40 can be obtained while the flue 12 is operating. I can grasp it.

  After the investigation based on the thermal image captured by the infrared camera 54 on the inner peripheral surface 40a of the outer peripheral concrete frame 40 is completed, the confirmation survey of the low temperature portion obtained by the investigation based on the thermal image is performed. By conducting a confirmation survey of the low-temperature part, it becomes possible to confirm in more detail whether the low-temperature part has appeared due to damage such as peeling or floating or other effects. Thus, it becomes possible to investigate the state of the inner peripheral surface 40a of the outer peripheral concrete frame 40 with higher accuracy.

  The confirmation survey of the low temperature part requires three workers. For example, the first worker operates the direction of the visible camera 55 of the insertion imaging unit 51 inserted into the survey hole 45a, and the second work. The operator operates the operation unit main body 52a of the operation unit 52 and instructs the imaging position of the insertion imaging unit 51 by the visible camera 55 while looking at the monitor. Then, the third worker inserts the light source device 60 from the investigation hole 44 a and irradiates the imaging portion with the light source device 60. The irradiation direction of the light source device 60 by the third worker is also performed by an instruction from the second worker. The low temperature portion shown in FIG. 9A is damaged such as a crack shown in FIG. 9B by imaging the low temperature portion with the visible camera 55 in a state where the buffer space 30 is illuminated with the light source device 60. Or it can confirm easily that the low-temperature part shown to Fig.10 (a) is not a damaged part as shown in FIG.10 (b). In this way, by imaging the low temperature part of the buffer space 30 with the light source device 60 illuminating the buffer space 30, it is possible to easily confirm whether or not the low temperature part is a damaged part. Thus, it becomes possible to further improve the accuracy of the investigation of the inner peripheral surface 40a of the outer peripheral concrete frame 40.

  When the survey of the inner peripheral surface 41a of the ceiling portion 41 of the outer peripheral concrete frame 40 using the survey holes 44a and 45a is finished, as shown in FIG. 7, another survey hole 44b, 45b can be drilled and the same investigation can be performed. Further, as shown in FIG. 8, another investigation hole 45c is formed in the ceiling portion 41, and the same investigation can be performed. In the present embodiment, the inner peripheral surface 41a of the ceiling portion 41 and the inner peripheral surfaces 42a and 43a of the pair of side wall portions 42 and 43 can be separately investigated. In each of the side wall portions 42 and 43, the survey holes are drilled into the cores, and after the respective survey holes are once closed, the selected survey holes are opened, and the insertion imaging unit 51 is inserted through the opened survey holes. Then, the situation of the inner peripheral surface 40a of the outer peripheral concrete frame 40 is investigated by taking a thermal image or a visible image of the inner peripheral surface 40a of the outer peripheral concrete frame 40 with the infrared camera 54 and / or the visible camera 55. Also good.

  And according to the flue examination method of this embodiment mentioned above, the buffer space 30 was interposed, and it faced the buffer space 30 of the outer periphery concrete housing 40 constructed in the outer peripheral part covering the flue main-body part 20 and this. The state of the inner peripheral surface 40a can be easily investigated while the flue 12 is operating.

  That is, according to the method for investigating a flue or chimney of this embodiment, at least two investigation holes 44a and 45a are made to penetrate from the top surface 40b, which is the outer peripheral surface of the outer peripheral concrete frame 40, toward the buffer space 30. After the drilling holes are formed and the formed survey holes 44a and 45a are once closed, the selected survey holes 44a and 45a are opened, and the infrared thermography device 53 is placed in the buffer space 30 through the opened survey holes 44a and 45a. Infrared thermography apparatus shows the change in the temperature of the inner peripheral surface 40a of the outer peripheral concrete frame 40 when the temperature inside the buffer space 30 is lowered by the outside air flowing into the buffer space 30 from the inserted inspection holes 44a and 45a. Ascertained from the images obtained by the 53 infrared cameras 54, the situation of the inner peripheral surface of the outer peripheral concrete frame 40 is investigated. To have. As a result, when a damaged part such as peeling or floating occurs on the inner peripheral surface 40a of the outer peripheral concrete frame 40, the damaged part appears as a low temperature part in the image obtained by the infrared camera 54. By searching the inner peripheral surface 40a of 40 with the infrared camera 54 and searching for a low temperature part, it becomes possible to easily grasp and investigate the damaged portion of the inner peripheral surface 40a of the outer peripheral concrete frame 40.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, in the flue or chimney structure in which the condition of the inner peripheral surface facing the buffer space of the outer peripheral concrete frame is investigated by the method for investigating the flue or chimney of the present invention, the flue gas is circulated toward the discharge port of the chimney. As long as it forms a flow path to be used, the chimney itself composed of a chimney main body portion and an outer peripheral concrete frame with a buffer space interposed therebetween is used as a flue or chimney structure. Survey methods can also be applied.

10 Flue structures (flues or chimney structures)
20 Flue body (body)
21 Refractory brick 30 Buffer space 40 Outer peripheral concrete frame 40a Inner peripheral surface 40b Outer peripheral surface (top surface)
44a, 44b Investigation holes 45a, 45b, 45c Investigation hole 50 Imaging unit 51 Insertion imaging unit 52 Operation unit 53 Infrared thermography device 54 Infrared camera 55 Visible camera 56 Heat-resistant protective body 57 Housing portion 58 Tube portion 59 Heat-resistant sheet 60 Light source device

Claims (4)

In a flue or chimney structure comprising a flue or chimney main body part and a peripheral concrete frame constructed on the outer peripheral part covering the main body part with a buffer space interposed between the main body part, A method for investigating a flue or chimney in which the state of the inner peripheral surface facing the buffer space of the outer peripheral concrete frame is investigated using an infrared thermography device while operating the flue or chimney,
After penetrating from the outer peripheral surface of the outer peripheral concrete frame toward the buffer space, at least two investigation holes are drilled, the formed investigation holes are once closed, and then the selected investigation holes are opened. The infrared thermography device is inserted into the buffer space through the opened research hole, and the temperature inside the buffer space is lowered by the outside air flowing into the buffer space from the opened research hole. A method for investigating a flue or chimney in which a change in the temperature of the inner peripheral surface of the outer peripheral concrete frame is grasped from an image obtained by an infrared camera of the infrared thermography device, and the state of the inner peripheral surface of the outer peripheral concrete frame is investigated.   The method for investigating a flue or chimney according to claim 1, wherein the main body is formed using refractory bricks.   The infrared thermography device includes a visible camera, and a light source device is inserted into the selected inspection hole to illuminate the buffer space, and also from an image obtained by the visible camera, the outer peripheral concrete frame The method for investigating a flue or chimney according to claim 1 or 2, wherein the state of the inner peripheral surface is investigated.   The infrared thermography device is adapted to be inserted into the buffer space in a state of being accommodated in the housing portion of a protective body including a housing portion and a tubular body portion, and through the tubular body portion. The flue according to any one of claims 1 to 3, wherein a state of an inner peripheral surface of the outer peripheral concrete frame is investigated by an image obtained by the infrared camera and / or the visible camera while feeding cool air to the casing. Or chimney survey method.