JP2015124967A - Boiler outer casing attachment structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boiler outer casing attachment structure suppressing generation of a clearance between each outer casing and a sound absorber at a time of fastening, by bolts, the outer casings to the outer surface of the sound absorber supported on the furnace wall of a boiler to be opposed to the furnace wall.SOLUTION: A boiler outer casing attachment structure is an outer casing attachment structure for covering an outer surface of a sound absorber supported on an outer surface of a furnace wall of a boiler so as to be opposed to the outer surface of the furnace with a clearance kept therebetween, with a plurality of outer casings. The outer casings each including an overlap part on a side edge thereof are disposed to mutually overlap one another in the overlap parts along the outer surface of the sound absorber. Fixed plates are provided to extend along the overlap parts of the outer casings, and bolts and nuts are provided to penetrate and fasten each pair of overlap parts of the outer casings overlapping each other, the corresponding fixed plate, and the sound absorber. The two overlap parts of the outer casings overlapping each other are fixedly attached to the fixed plate so as to be fixed to the sound absorber by fastening by the bolts and nuts.

Description

  The present disclosure relates to an exterior plate mounting structure in which an outer surface of a sound-absorbing material supported to be opposed to a furnace wall of a boiler is covered with a plurality of exterior plates.

  A boiler is known as an apparatus for obtaining high-temperature and high-pressure steam by heating water with heat obtained by burning fuel. In this boiler, when the fuel is burned, the furnace wall forming the furnace vibrates and generates noise.

  Patent Document 1 discloses a duct wall structure of an exhaust heat recovery boiler that recovers energy of combustion gas generated in a gas turbine to generate steam, and generates power by the steam turbine using the obtained steam. It is disclosed. In this duct wall structure, a heat insulating member is filled between an inner plate on the gas flow side and an outer plate on the outside air side, an intermediate member is disposed at an intermediate portion between the inner plate and the outer plate, and the inner plate and the intermediate member are connected by stud bolts. The distance between the outer plate and the intermediate member is maintained by a stud bolt, and the stud bolt and the outer plate are tightened via a vibration-proof washer. According to the duct wall structure of this exhaust heat recovery boiler, the noise propagation path between the outer plate and the inner plate is inner plate → stud bolt → intermediate plate → stud bolt → outer plate, and noise is propagated from the inner plate to the outer plate. Compared with a noise path, the path length becomes longer and noise can be reduced.

  Even if the duct wall structure described in Patent Document 1 is applied to a furnace wall of a boiler, it may be difficult to completely block the noise if the noise is large. Therefore, a sound absorbing material may be disposed along the outer surface of the furnace wall, and an exterior plate may be disposed along the outer surface of the sound absorbing material. The exterior plate has a function of restricting the noise passing through the sound absorbing material from leaking to the outside and reflecting the noise passing through the sound absorbing material back into the sound insulating plate.

  Since the installation of the exterior plate is performed by an operator, the exterior plate is set to a size that allows the operator to construct the exterior plate. For this reason, in order to cover the outer surface of a sound-absorbing material, it is necessary to fix to the outer surface of a sound-absorbing material in the state which connected the some exterior board. Then, if a nut is screwed and fastened to the bolt which penetrated the exterior board and the sound-absorbing material, a plurality of exterior boards can be fixed to the sound-absorbing material.

JP-A-11-159347

  However, when the fastening force of the bolt is increased to securely fix the exterior plate to the sound absorbing material, the portion of the exterior plate fastened by the bolt is deformed so as to bite into the inside of the sound absorbing material. Therefore, the exterior plate between the plurality of bolts that fasten the exterior plate is bent, and a gap is generated between the exterior plate and the outer surface of the sound absorbing material, and noise may leak out from the gap.

  In view of the above-described circumstances, at least some embodiments of the present invention, when covering the outer surface of the sound absorbing material opposed to the furnace wall of the boiler with a plurality of exterior plates, fastening the exterior plate to the sound absorbing material with bolts An object of the present invention is to provide a boiler exterior plate mounting structure in which a gap is unlikely to be generated between the exterior plate and the side surface of the sound absorbing material when fixing.

A boiler exterior plate mounting structure according to some embodiments of the present invention is as follows.
It is an exterior plate mounting structure that covers the outer surface of the sound-absorbing material that is opposed and supported with a gap with respect to the outer surface of the furnace wall of the boiler,
A plurality of the exterior plates arranged to overlap each other along the outer surface of the sound-absorbing material are disposed on the side edges, respectively.
A fixing plate extending along the overlapping portion of the exterior plate is provided,
There are provided bolts and nuts that pass through and fasten the two overlapping portions of the exterior plate overlapped with each other, the fixing plate, and the sound absorbing material,
By the fastening with the bolts and nuts, the two overlapping portions of the exterior plate overlapped with each other are brought into close contact with the fixing plate and fixed to the sound absorbing material.

  According to the exterior plate mounting structure of the boiler, the fixed plate extending along the overlapped portion of the exterior plate is provided, and the two overlapped portions of the exterior plate, the fixed plate, and the sound absorbing material that are overlapped with each other Bolts and nuts that pass through and are fastened are provided, so that when the two superpositions of the exterior plates overlapped with each other and the fixing plate and the sound absorbing material are fastened by the bolts and nuts, the bolts and nuts The fastening force is dispersed on the average in the extending direction of the fixed plate through the fixed plate. For this reason, the two overlapping portions of the exterior plates that are overlapped with each other are fixed to the sound absorbing material in a state in which the deformation is suppressed by the fastening force dispersed in the extending direction of the fixing plate and in close contact with the fixing plate. The Therefore, it is possible to realize a boiler exterior plate mounting structure in which a gap is hardly generated between the exterior plate and the sound absorbing material.

In some embodiments,
The fixing plate is configured to be disposed between two overlapping portions that are overlapped with each other.

  In this case, since the fixing plate is disposed between two overlapping portions that are overlapped with each other, one of the two overlapping portions is in surface contact with the surface on one side in the thickness direction of the fixing plate. The other of the two overlapping portions is in surface contact with the surface on the other side in the thickness direction of the fixed plate. When the two overlapping portions of the exterior plate, the fixing plate, and the sound absorbing material, which are overlapped with each other, are fastened by the bolts and nuts, the two overlapping portions are brought into close contact with both surfaces of the fixing plate, and the deformation is further improved. It is suppressed. Therefore, it is possible to realize a boiler exterior plate mounting structure in which a gap is less likely to be generated between the exterior plate and the sound absorbing material.

In some embodiments,
The fixing plate is configured to be fixed to one of the overlapping portions of the exterior plates that are overlapped with each other.

  In this case, since it is fixed to one of the overlapping portions of the exterior plates that are superimposed on each other, it is possible to reduce the labor of the operator who arranges the fixing plate along the overlapping portion of the exterior plates. Can do.

In some embodiments,
The exterior plate is formed in a wave shape in which ridges and grooves extending in the vertical direction of the sound absorbing material are alternately positioned along the width direction of the sound absorbing material.

  In this case, since the ridges and grooves of the exterior plate extend in the vertical direction of the sound absorbing material and are alternately positioned along the width direction of the sound absorbing material, they are formed in a wave shape. On the other hand, it is possible to improve the bending rigidity on the orthogonal side. For this reason, when arrange | positioning an exterior board along the side surface of a sound-absorbing material, the situation where an exterior board bends and it becomes difficult to perform arrangement | positioning work can be prevented beforehand.

In some embodiments,
The exterior plate is formed in a rectangular wave shape in which the ridges and the concave grooves are formed in a square shape in a sectional view, and the ridges and the concave grooves are alternately positioned along the width direction of the sound absorbing material. Configured as follows.

  In this case, the exterior plate is formed in a rectangular wave shape in which the ridges and the grooves are formed in a square shape in cross section, and the ridges and the grooves are alternately positioned along the width direction of the sound absorbing material. Therefore, the overlapping part of the exterior plate can be formed in a flat plate shape. For this reason, the fixing plate which contacts the overlapping portion can also be formed into a flat plate shape, and the boiler exterior plate mounting structure can be simplified.

In some embodiments,
The fixing plate is configured to have rigidity capable of suppressing deformation when fastened by the bolt and the nut.

  In this case, since the fixing plate has a rigidity capable of suppressing deformation at the time of fastening with the bolt and the nut, the two overlapping portions of the exterior plate and the fixing plate which are overlapped with each other by the bolt and the nut When the sound absorbing material is fastened, deformation of the fixing plate is suppressed. For this reason, it is possible to more reliably suppress the deformation of the two overlapping portions of the externally stacked exterior plates.

In some embodiments,
On the back surface of the sound absorbing material, a sound transmitting member is provided that is disposed along the back surface and has a plurality of holes to guide the sound absorbing material through sound generated from the boiler,
The sound transmitting member is configured to be fastened to the sound absorbing material by being fastened by the bolt and the nut together with the two overlapping portions of the exterior plate, the fixing plate, and the sound absorbing material that are overlapped with each other. Is done.

  In this case, a sound transmission member having a plurality of holes is provided along the back surface of the sound absorbing material, and the sound transmission member is combined with two overlapping portions of the exterior plate, the fixing plate, and the sound absorbing material that are overlapped with each other. Since the bolt and nut are fastened and fixed to the sound absorbing material, the fastening force by the bolt and nut acts on the sound absorbing material through the sound transmitting member. For this reason, since fastening force is disperse | distributed along a sound-transmitting member, the possibility that a volt | bolt and a nut may bite into a sound-absorbing material and a sound-absorbing material may deform | transform can be prevented.

  According to at least some embodiments of the present invention, when the exterior plate is fastened and fixed to the sound absorbing material with bolts, the boiler exterior plate mounting structure is less likely to generate a gap between the exterior plate and the side surface of the sound absorbing material. Can be provided.

The figure (a) is a sectional view of the sound insulation structure corresponding to the Ia-Ia arrow view of the figure (b), and the figure (b) is a side view of the sound insulation structure. It is sectional drawing of a sound-insulation structure provided with the exterior panel attachment structure of the boiler corresponded to Ib-Ib arrow of FIG.1 (b). The figure (a) is a fragmentary sectional view of a sound insulation structure when a fixed board is arranged on the surface side of two superposition parts of a piled exterior board, and the figure (b) was piled up. It is a fragmentary sectional view of a sound insulation structure at the time of being arranged on the back side of two overlapping parts of an exterior board. It is a fragmentary sectional view of the sound insulation structure at the time of using the protruding item | line of an exterior board as an overlapping part.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a boiler exterior plate mounting structure according to the present invention will be described with reference to FIGS. In the present embodiment, a description will be given of a boiler exterior plate mounting structure in which an exterior plate formed in a rectangular wave shape in a cross-sectional view is taken as an example. It should be noted that the 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.

  First, before describing the boiler outer plate mounting structure of the present invention, a sound absorbing material support structure for supporting the sound absorbing material provided with the boiler outer plate mounting structure on the boiler will be described with reference to FIG. As shown in FIG. 2 (cross-sectional view), the sound absorbing material support structure includes a plurality of support members 63 that protrude from the outer surface 61a of the furnace wall 61 of the boiler 60 that extends in the vertical direction. The plurality of support members 63 are disposed on the outer surface 61 a of the furnace wall 61 with a space in the vertical direction, and are disposed with a space in the width direction of the outer surface 61 a of the furnace wall 61. The support member 63 can hold the sound insulation structure 50 described later via the holding member 65. The height of the support member 63 is such that a gap 67 is formed so that the bolt 40 used in the exterior plate mounting structure does not contact the outer surface 61a of the furnace wall 61, and a heat insulating material 68 can be installed on the outer surface 61a of the furnace wall 61. It has a size.

  The holding member 65 is formed of a so-called H-shaped steel that is formed in an H shape in a side view and extends linearly along the outer surface 61 a of the furnace wall 61. The holding member 65 is configured symmetrically in the width direction when viewed from the side, and extends in the vertical direction of a pair of left and right flange portions left 65a and flange portion right 65b extending substantially in parallel in the vertical direction, and flange portion left 65a and flange portion right 65b. And a plate-like web 65c connecting the central portions. The holding member 65 is slidable along the outer surface 61 a of the furnace wall 61 by being fixed to the tip of the support member 63 with the flange portion right 65 b extending in the vertical direction.

  A protruding plate 66 that protrudes between two holding members 65 arranged at intervals in the vertical direction is attached to the inner surface of the web 65c of the holding member 65. The protruding plate 66 extends along the left flange portion 65 a of the holding member 65. The protruding plate 66 is fixed to the inner surface of the web 65c (for example, fixed by welding) after the sound insulating structure 50 is held by the holding member 65. The dimension X between the protruding plate 66 and the flange portion right 65b has a size that can accommodate the sound insulation structure 50 in which the exterior plate 20 and the fixed plate 30 are provided on the sound absorbing material 10 described later. For this reason, when the sound insulation structure 50 is accommodated between the protruding plate 66 and the flange portion right 65b, the movement of the sound insulating structure 50 in the width direction of the holding member 65 can be restricted by the protruding plate 66 and the flange portion right 65b. .

  Next, the boiler exterior plate mounting structure of the present invention will be described with reference to FIGS. As shown in FIGS. 1 (a) and 1 (b), the boiler exterior plate mounting structure has overlapping portions 20a on the side edges, and overlaps with each other along the outer surface 10a of the sound absorbing material 10. A plurality of exterior plates 20 arranged by overlapping 20a, a fixed plate 30 extending along an overlap portion 20a of the exterior plate 20, and two overlapping portions 20a of the exterior plates 20 that are overlapped with each other. It has a bolt 40 and a nut 43 that pass through and fasten the fixing plate 30 and the sound absorbing material 10.

  The sound absorbing material 10 is a plate-like member formed in a rectangular shape in a side view, and is formed by collecting fibers born from glass fibers or steel stones. For this reason, since there exists a possibility that the sound-absorbing material 10 may be crushed when a load acts, a large load cannot be applied. The sound absorbing material 10 is formed in a size (for example, a horizontal dimension of 600 mm and a vertical dimension of 1800 mm) that can be grasped and carried by an operator. The sound absorbing material 10 is provided with a plurality of bolt insertion holes 10 b for attaching the exterior plate 20 along the outer surface 10 a of the sound absorbing material 10. The bolt insertion holes 10b are provided with a certain interval in the vertical direction.

  The exterior plate 20 is formed by bending a sheet metal, and is formed in a rectangular wave shape in which ridges 21 and grooves 23 extending in the vertical direction are alternately positioned in the width direction, and the entire exterior plate 20 is viewed from the side. Are formed in a vertically long rectangular shape. The exterior plate 20 has a size (for example, a horizontal dimension of 600 mm and a vertical dimension of 1800 mm) that can be grasped and carried by an operator. The ridges 21 and the concave grooves 23 are formed in a square shape having substantially the same size in a side view. On the side edges on both sides in the width direction of the exterior plate 20, plate-like overlapping portions 20 a extending in the vertical direction along the ridges 21 and the groove 23 are formed. The overlapping portion 20a is formed in a rectangular shape in a side view, and the width of the overlapping portion 20a is large enough to allow insertion of a tool for rotating the nut 43 that fixes the exterior plate 20 to the sound absorbing material 10. Yes.

  The overlapping portion 20a is provided with a plurality of holes 20b with a certain interval in the vertical direction. The shaft portion 40a of the bolt 40 is inserted through the hole portion 20b. The interval between the holes 20 b is the same as the interval between the plurality of bolt insertion holes 10 b provided in the sound absorbing material 10.

  The fixed plate 30 is a plate-like member formed in a rectangular shape in a side view. The vertical length of the fixed plate 30 is substantially the same as the vertical length of the overlapping portion 20 a of the exterior plate 20. Further, the width of the fixed plate 30 is smaller than the width of the overlapping portion 20 a of the exterior plate 20. A plurality of hole portions 30a are provided in the center portion in the width direction of the fixed plate 30 with intervals in the vertical direction. The intervals between the plurality of hole portions 30 b are the same as the intervals between the plurality of bolt insertion holes 10 b provided in the sound absorbing material 10.

  The fixing plate 30 has rigidity that is difficult to be deformed when the bolt 40 and the nut 43 are fastened. As described above, since the sound absorbing material 10 is formed of glass fiber or the like, there is a possibility that the sound absorbing material 10 may be crushed when a large load is applied. Therefore, the upper limit of the fastening force is set so that the fastening force does not become excessive when the bolt 40 and the nut 43 are fastened. The rigidity (for example, plate thickness, material, etc.) of the fixed plate 30 is set so that the deformation of the fixed plate 30 is reduced when the set upper limit fastening force acts on the fixed plate 30.

  Next, a method for attaching the outer plate of the boiler 60 for attaching the outer plate 20 to the sound absorbing material 10, and a method for manufacturing and mounting the sound insulating structure 50 will be described. First, a method for manufacturing the sound insulation structure 50 will be described. The sound insulation structure 50 is manufactured by arranging a transmission member 45 (for example, a wire mesh) on the back surface side of the sound absorbing material 10, arranging the exterior plate 20 and the fixing plate 30 on the surface side of the sound absorbing material 10, and attaching bolts 40 to these. The sound insulation structure 50 is completed by inserting and fastening the nut 43 to the bolt 40 and fastening it.

  Next, a method for mounting the sound insulation structure 50 will be described. As shown in FIG. 2, the completed sound insulation structure 50 is inserted and fitted between the webs 65c of the holding member 65 arranged in the vertical direction. The web 65c, the flange portion left 65a, and the flange portion right 65b of the holding member 65 have a length that allows the sound insulation structure 50 to be fitted, and can support the weight of the sound insulation structure 50. Has strength. Protruding plates 66 are disposed along the upper and lower portions of the surface side of the sound insulation structure 50 fitted, and these protrusion plates 66 are welded to the inner surface of the web 65c of the holding member 65 so that the sound insulation structure 50 is not displaced. To do.

  Next, a method for attaching the exterior plate of the boiler 60 for attaching the exterior plate 20 to the sound absorbing material 10 will be described. The exterior plate 20 is attached to the sound absorbing material 10 before the sound insulation structure 50 is fitted between the holding portions. First, the exterior plate 20 is disposed along the outer surface 10 a of the sound absorbing material 10. At this time, the direction of the exterior plate 20 is changed so that the ridges 21 and the recessed grooves 23 of the exterior plate 20 extend in the vertical direction, and the exterior plate 20 is disposed on the outer surface 10 a of the sound absorbing material 10. Further, when the exterior plate 20 is disposed on the outer surface 10 a of the sound absorbing material 10, the shaft portion 40 a of the bolt 40 protruding from the sound absorbing material 10 is inserted into the hole 20 b of the overlapping portion 20 a of the exterior plate 20.

  Then, the fixing plate 30 is disposed along the surface of the overlapping portion 20a, and the shaft portion 40a of the bolt 40 protruding from the hole portion 20b of the overlapping portion 20a is inserted into the hole portion 30a of the fixing plate 30. Then, in order to cover the surface of the sound absorbing material 10 with the other exterior plate 20, the direction of the exterior plate 20 is changed so that the ridges 21 and the recessed grooves 23 of the other exterior plate 20 extend in the vertical direction, and the exterior plate 20 is It arrange | positions on the outer surface 10a of the sound-absorbing material 10. When the exterior plate 20 is disposed on the outer surface 10 a of the sound absorbing material 10, the shaft portion 40 a of the bolt 40 protruding from the fixed plate 30 is inserted into the hole 20 b of the overlapping portion 20 a of the other exterior plate 20. Then, the nut 43 is screwed into the shaft portion 40a of the bolt 40 protruding from the hole 20b of the overlapping portion 20a of the other exterior plate 20, and the two overlapping portions 20a of the exterior plate 20 are secured by the bolt 40 and the nut 43. Is fastened to the fixing plate 30, and the two overlapping portions 20 a are fixed to the outer surface 10 a of the sound absorbing material 10.

  Then, the overlapping portion 20 a of another exterior plate 20 is fastened to the overlapping portion 20 a of the other exterior plate 20 via the fixed plate 30. Since the fastening method of the other exterior board 20 is the same as the method mentioned above, the description is abbreviate | omitted. In this way, the plurality of exterior plates 20 are fixed to the sound absorbing material 10 in a state of covering the outer surface 10 a of the sound absorbing material 10.

  Thus, in a state where the sound insulation structure 50 to which the exterior plate 20 is attached is supported between the holding members 65, the head 40b of the bolt 40 through which the sound absorbing material 10 is inserted is a pair of support members 63 arranged vertically. It is disposed at a position in the gap 67 between them and away from the furnace wall 61. For this reason, vibration generated in the boiler 60 is not directly transmitted to the sound insulation structure 50 via the bolt 40.

  In addition, the sound generated in the boiler 60 is transmitted to the outside of the boiler 60 through the furnace wall 61, and the emitted sound is reflected by the exterior plate 20 through the sound absorbing material 10 and is heated in the sound absorbing material 10. The sound is absorbed instead. Here, a plurality of outer surfaces 10 a of the sound absorbing material 10 are covered by the exterior plate 20, and the two overlapping portions 20 a of the overlapped exterior plate 20 are fastened to the fixed plate 30 by bolts 40 and nuts 43. For this reason, the two overlapping portions 20 a of the exterior plate 20 that are overlapped with each other are prevented from being deformed by the fastening force dispersed in the extending direction of the fixing plate 30 and are in close contact with the fixing plate 30. It is fixed to the sound absorbing material 10. Therefore, it is possible to realize a boiler exterior plate mounting structure in which a gap is unlikely to be generated between the two overlapping portions 20a of the exterior plates 20 overlapped with each other.

  Further, since the fixing plate 30 is disposed between the two overlapping portions 20a that are overlapped with each other, one of the two overlapping portions 20a is in surface contact with the surface on one side in the thickness direction of the fixing plate 30. Then, the other of the two overlapping portions 20 a comes into surface contact with the surface on the other side in the thickness direction of the fixed plate 30. Then, when the two overlapping portions 20 a, the fixing plate 30, and the sound absorbing material 10 of the exterior plate 20 that are overlapped with each other are fastened by the bolt 40 and the nut 43, the two overlapping portions 20 a The deformation of the overlapping portion 20a is further suppressed by being in close contact with both surfaces. Therefore, it is possible to realize a boiler exterior plate mounting structure in which a gap is less likely to be generated between the exterior plate 20 and the sound absorbing material 10.

  Further, since the ridges 21 and the concave grooves 23 of the exterior plate 20 extend in the vertical direction of the sound absorbing material 10 and are alternately positioned along the width direction of the sound absorbing material 10, they are formed in a wave shape. The bending rigidity on the side perpendicular to the vertical direction can be improved. For this reason, when arrange | positioning the exterior board 20 along the outer surface 10a of the sound-absorbing material 10, the situation which the exterior board 20 bends and it becomes difficult to perform arrangement | positioning work can be prevented beforehand.

  In the above-described embodiment, the fixing plate 30 is disposed between the two overlapping portions 20a of the exterior plate 20 overlapped with each other. However, as shown in FIG. The fixed plate 30 may be disposed on the surface of the overlapping portion 20a on the front surface side of the two overlapping portions 20a of the exterior plate 20 that are overlapped with each other. If it does in this way, since the fixed plate 30 is always in the exposed position, the position adjustment work of the fixed plate 30 with respect to the overlapping portion 20a can be facilitated.

  Moreover, as shown in FIG.3 (b), you may make it arrange | position the fixing plate 30 in the back surface of the overlapping part 20a of the back surface side among the two overlapping parts 20a of the exterior plate 20 mutually overlap | superposed. . If it does in this way, since the whole side surface of the one side of the fixed plate 30 comes into close contact with the outer surface 10a of the sound absorbing material 10, the gap between the fixed plate 30 and the sound absorbing material 10 can be further reduced. .

  Further, in the above-described embodiment, the case where the fixing plate 30 is disposed between the two overlapping portions 20a of the exterior plates 20 that are superimposed on each other is shown. The fixing plate 30 may be fixed (for example, welded) to the one overlapping portion 20. If it does in this way, the labor of the worker who arranges fixed board 30 along superposition part 20a of exterior board 20 can be reduced.

  Further, in the above-described embodiment, the fixing plate 30 is shown as being disposed between the two overlapping portions 20a that form part of the concave groove 23 of the exterior plate 20 overlapped with each other. As shown in 4, it may be arranged between two overlapping portions 20a that form part of the ridges 21 of the exterior plate 20 that are overlapped with each other. If it does in this way, the effect similar to the case where it arrange | positions between the two overlapping parts 20a which form a part of the ditch | groove 23 of the exterior board 20 overlaid mutually, ie, the exterior board 20, and the sound-absorbing material 10 will be demonstrated. It is possible to realize a boiler exterior plate mounting structure in which a gap is hardly generated between the two.

  In this case, you may provide the nut 44 screwed together by the axial part 40a of the volt | bolt 40 in the inner surface of the overlapping part 20a inside the two overlapping parts 20a. In this way, the nut 44 and the nut 43 disposed on the outer surface of the overlapping portion 20a disposed on the outer side of the two overlapping portions 20a are coupled together so that two overlapping portions are formed on both surfaces of the fixing plate 30. The mating portion 20a can be reliably brought into close contact, and a boiler exterior plate mounting structure in which a gap is less likely to be generated between the exterior plate 20 and the sound absorbing material 10 can be realized.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the object of the present invention. For example, the various embodiments described above may be combined as appropriate.

DESCRIPTION OF SYMBOLS 10 Sound-absorbing material 10a, 61a Outer surface 10b Bolt insertion hole 10c Back surface 20 Exterior plate 20a Overlapping part 20b, 30a, 45a Hole part 21 Projection 23 Concave groove 30 Fixing plate 40 Bolt 40a Shaft part 40b Head part 43, 44 Nut 45 Through Sound member 50 Sound insulation structure 60 Boiler 61 Furnace wall 63 Support member 65 Holding member 65a Flange part left 65b Flange part right 65c Web 66 Projection plate 67 Gap 68 Heat insulation material

Claims (7)

It is an exterior plate mounting structure that covers the outer surface of the sound-absorbing material that is opposed and supported with a gap with respect to the outer surface of the furnace wall of the boiler,
A plurality of the exterior plates arranged to overlap each other along the outer surface of the sound-absorbing material are disposed on the side edges, respectively.
A fixing plate extending along the overlapping portion of the exterior plate is provided,
There are provided bolts and nuts that pass through and fasten the two overlapping portions of the exterior plate overlapped with each other, the fixing plate, and the sound absorbing material,
A structure for mounting an outer panel of a boiler, wherein two overlapping portions of the outer panel overlapped with each other by being fastened by the bolt and the nut are brought into close contact with the fixing plate and fixed to the sound absorbing material. The boiler exterior plate mounting structure according to claim 1, wherein the fixing plate is disposed between two overlapping portions that are overlapped with each other. The boiler exterior plate mounting structure according to claim 2, wherein the fixing plate is fixed to one of the overlapping portions of the exterior plates that are overlapped with each other. The said exterior board is formed in the wave shape from which the protruding item | line and the ditch | groove extended in the up-down direction of the said sound-absorbing material are located alternately along the width direction of this sound-absorbing material. The boiler exterior plate mounting structure described in any one of the above. The exterior plate is formed in a rectangular wave shape in which the ridges and the recessed grooves are formed in a square shape in a sectional view, and the ridges and the recessed grooves are alternately positioned along the width direction of the sound absorbing material. The boiler exterior plate mounting structure according to claim 4, wherein: The boiler fixing plate mounting structure according to any one of claims 1 to 5, wherein the fixing plate has a rigidity capable of suppressing deformation when fastened by the bolt and the nut. On the back surface of the sound absorbing material, a sound transmitting member is provided that is disposed along the back surface and has a plurality of holes to guide the sound absorbing material through sound generated from the boiler,
The sound transmitting member is fastened to the sound absorbing material by being fastened by the bolt and the nut together with the two overlapping portions of the exterior plate, the fixing plate, and the sound absorbing material that are overlapped with each other. The boiler exterior plate mounting structure according to any one of claims 1 to 6.

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