JPH09302996A - Smokestack and method for constructing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a smokestack having a long life by attaching a panel made from fiber reinforced plastics to the inner surface of a body of the smokestack of concrete. SOLUTION: A panel 7 composed of a plurality of panel pieces 7a made from fiber reinforced plastics is attached to the inner surface 3a of a body 3 of a smokestack made from concrete. The panel pieces 7a are fixed to the inner surface 3a of the body 3 through heat resistant adhesives 8, anchor pieces 9, and fixing frames 10 to prevent exhaust gas from contacting the inner surface of the body 3. The panel 7 is formed of a fiber reinforced plastic body prepared by stacking carbon fibers using thermosetting resin as matrix and aluminum foils are provided in the central zone of the plastic body in a sandwiched form, and alumina fibers are provided on the side of the inner surface, while granular ceramics are fixedly attached to the outer surface of the body, and moreover the inner surface is covered with films of Teflon. Thus deterioration of the stack body can be avoided and the life of the stack can be maintained for a long period of time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chimney having an inner surface reinforced with fiber reinforced plastic (FRP) and a method for constructing the same.

[0002]

2. Description of the Related Art In the case of constructing a chimney 1 as shown in FIG. 6, conventionally, as an example thereof, as shown in FIG. 7, after arranging a crack preventing reinforcing bar 4 on the inner surface of a steel plate cylinder 2, There is one in which concrete is lined on the inner surface of the steel plate cylinder 2 to form a concrete chimney main body 3 containing reinforcing bars 4, and an acid heat resistant castable 5 is formed on the inner surface of the chimney main body 3.

As another conventional example, as shown in FIG. 8, after reinforcing steel bars 4 for preventing cracks are laid on the inner surface of a cylindrical formwork, concrete is lined on the inner surface of the formwork to reinforce the steel bar 4. There is one in which a concrete chimney body 3 containing concrete is formed and the formwork is removed from the chimney body 3.

[0004]

In the above-mentioned conventional chimney,
Since the inner surface of the concrete chimney body 3 is in direct contact with the flue gas, the inner surface of the chimney body 3 is easily oxidized and deteriorated by the sulfurous acid gas contained in the flue gas. In the case of a high chimney that receives high heat intermittently, the inner surface of the chimney body 3 is repeatedly subjected to thermal stress to promote deterioration, and many cracks are generated on the inner surface of the chimney body 3 in a short period of time. Since concrete is peeled off from the concrete and scattered, and the reinforcing bars 4 are corroded, the life of the chimney is short and repair is time-consuming.

In view of the above problems, it is an object of the present invention to provide a chimney capable of maintaining a long life and a method of constructing the chimney.

[0006]

To achieve the above object, the present invention according to claim 1 is characterized in that a fiber reinforced plastic panel is attached to the inner surface of a concrete chimney body.

According to the above construction, since the inner surface of the concrete chimney body is protected by the fiber reinforced plastic panel so that the exhaust gas does not contact the inner surface of the chimney body, deterioration of the chimney body is prevented. It is possible to maintain the life of the chimney for a long time, and since the heat insulating property of the panel is high, the thickness of the chimney main body can be made thinner than the conventional one, which is economical.

The invention of claim 2 is characterized in that, in the invention of claim 1, an aluminum foil is interposed in a sandwich shape in a central portion of the panel. According to the above configuration, the aluminum foil interposed in the central portion of the panel reflects heat to enhance heat insulation, so high heat is intermittently received, such as a chimney for a power plant that is inactive at night. Even if it is a thing, the thermal stress applied to the inner surface of the chimney body can be reduced to prevent deterioration, and since the aluminum foil blocks moisture so that it does not touch the inner surface of the chimney body, it is an adhesive for panels etc. Can be prevented from deteriorating.

The invention described in claim 3 is the first or second invention.
In the invention described above, alumina fibers are interposed on the inner surface side in the panel. According to the above-mentioned composition, heat resistance and heat insulation are improved by alumina fiber, and it can prevent that the inner surface of the stack body is deteriorated.

The invention according to claim 4 is characterized in that, in the invention according to any one of claims 1 to 3, ceramic is interposed on the outer surface side of the panel. According to the above structure, it is possible to prevent the inner surface of the chimney body from being deteriorated by increasing the heat insulating property by the ceramic, and at the same time, the granular ceramic is sprayed and fixed to the outer peripheral surface of the panel,
This makes it possible to form irregularities on the outer peripheral surface of the panel and reliably adhere the panel to the inner surface of the chimney body with an adhesive.

According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the panel is divided into a plurality of panel pieces, and each panel piece is provided so as to project from an inner surface of the chimney body. It is characterized by being fixed to the inner surface of the chimney body by anchor screws.

According to the above construction, since the panel is divided into a plurality of panel pieces, when the panel is damaged, only the damaged panel piece needs to be replaced, which is economical and , Each panel piece can be securely fixed to the inner surface of the chimney body by the anchor screw.

According to a sixth aspect of the present invention, in the invention according to the fifth aspect, the anchor screw has a screw body and a screw head projecting from a base end portion of the screw body. Is inserted into the screw hole formed on the inner surface of the chimney body through the through hole penetrating the panel piece, and is bonded to the screw hole through the adhesive injection hole penetrating the screw head and the screw body. It is characterized by being fixed to the chimney body by injecting the agent.

According to the above construction, after the panel piece is arranged on the inner surface of the chimney body, the screw body of the anchor screw is inserted into the screw hole of the chimney body through the through hole of the panel piece, and the adhesive of the anchor screw is used. By injecting an adhesive agent into the screw hole through the injection hole, the anchor screw can be easily fixed to the chimney body by a so-called retrofitting method, and the head of the anchor screw allows the panel piece to be attached to the inner surface of the chimney body. Can be securely fixed to.

The invention according to claim 7 is the invention according to claim 5 or 6.
In the invention described above, a joint groove is formed on an inner surface of the chimney main body along joints between the panel pieces, and the cross section is substantially T including a strip plate portion and a projection portion projecting from the strip plate portion. By inserting the protrusion of the character-shaped fixed frame into the joint groove through the joint, and by injecting an adhesive into the joint groove through an adhesive injection hole penetrating the strip plate and the protrusion,
The projection is fixed to the chimney body, and the peripheral edge of each panel piece is fixed to the inner surface of the chimney body by the strip plate.

According to the above construction, after the panel piece is arranged on the inner surface of the chimney body, the protruding portion of the fixed frame is inserted into the joint groove through the joint between the panels, and the adhesive injection hole of the fixed frame is formed. By injecting an adhesive into the joint groove through it, the fixed frame can be easily fixed to the chimney body, and the band plate portion of the fixed frame securely fixes the peripheral edge of the panel piece to the inner surface of the chimney body. It is possible,
It is possible to prevent rainwater from entering the joints.

The invention according to claim 8 is a method for constructing a chimney in which a plurality of fiber-reinforced plastic panel pieces are attached to the inner surface of a concrete chimney body, wherein the joints between the panel pieces are attached to the inner surface of the chimney body. A plurality of panel holes are formed on the inner surface of the chimney body while the joint groove facing each other and a plurality of screw holes facing the through hole provided in each panel piece are formed. By inserting the screw main body of a plurality of anchor screws having a screw head projecting at the base end into the screw hole through the through hole of each panel piece, the panel head is made to the chimney by the screw head. The strip plate is fixed to the inner surface of the main body, and the projecting portion of a fixed frame having a substantially T-shaped cross section, which comprises the strip plate portion and the projecting portion projecting from the strip plate portion, is fitted into the joint groove. Perimeter of each panel piece by part The is characterized in that fixed to the chimney body.

According to the above structure, each panel can be easily and surely fixed to the inner surface of the chimney body by using the anchor screw and the fixing frame, and is particularly suitable for repairing the inner surface of the existing chimney.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a main part of a chimney 1 (see FIG. 6) according to an embodiment of the present invention, in which a plurality of inner surfaces 3a of a concrete chimney main body 3 lined on the inner surface of a steel plate cylinder 2 are provided. A panel 7 made of a fiber reinforced plastic panel piece 7a is attached, and as shown in FIG. 2, each panel piece 7a is attached to the inner surface 3 of the chimney body 3 by a heat resistant adhesive 8, anchor screws 9 and a fixed frame 10.
It is fixed to a.

As shown in FIG. 3, the panel 7 has a fiber-reinforced plastic body 7 in which carbon fibers or glass fibers are laminated with a thermosetting resin such as vinyl ester resin, epoxy resin or phenol resin as a matrix.
A, an aluminum foil 7B sandwiched in the center of the plastic body 7A, and a plastic body 7
A coating 7 made of alumina fibers 7C interposed on the inner surface side of A and granular ceramics 7D sprayed and fixed to the outer surface of the plastic body 7A, the inner surface of the plastic body 7A being made of polytetrafluoroethylene (Teflon)
Covered with E.

According to the above construction, the inner surface 3a of the concrete chimney body 3 is formed by the fiber reinforced plastic panel 7.
To prevent smoke from coming into contact with the inner surface 3a of the chimney main body 3. In particular, the aluminum foil 7B reflects heat to enhance heat insulation and also the thermal stress applied to the inner surface 3a of the chimney main body 3. The heat resistance and heat insulation are improved by the alumina fibers 7C, and the heat insulation and the heat insulation are improved by the ceramics 7D. The ceramic 7D forms irregularities on the outer peripheral surface of the panel 7 so that the panel 7 can be reliably adhered to the inner surface 3a of the chimney body 3 via the adhesive 8, and the coating 7E made of polytetrafluoroethylene. As a result, scattered matter is prevented from adhering to the panel 7, so that deterioration of the chimney body 3 can be reliably prevented and the life of the chimney can be maintained for a long period of time, and the heat insulation of the panel 7 is high. So can be thinner than the thickness of the chimney body 3 in the prior art, it is economical. When the temperature of the exhaust gas is low (for example, 140 ° C to 125 ° C), the alumina fiber 7C can be omitted.

Further, since the panel 7 is divided into a plurality of panel pieces 7a, when the panel 7 is damaged, only the damaged panel piece 7a needs to be replaced, which is economical.

The anchor screw 9 is made of engineering plastic and has a shaft-shaped screw body 9a and a screw head 9b protruding from the base end of the screw body 9a, as shown in FIG. A taper surface 9c is formed on the outer peripheral surface of the tip of the screw body 9a so as to spread outward toward the tip, and an adhesive injection hole 12 is formed in the center of the screw head 9b and the screw body 9a.

Through holes 13 are formed at the four corners of each panel piece 7a, and screw holes 14 are formed on the inner surface 3a of the chimney body 3 in which the panel pieces 7a are arranged so as to face the through holes 13. Are formed.

According to the above construction, after the panel piece 7a is arranged on the inner surface 3a of the chimney body 3, the screw body 9a of the anchor screw 9 passes through the through hole 13 of the panel piece 7a and the chimney body 3 is formed.
By inserting the adhesive 8 into the screw hole 14 through the adhesive injection hole 12, the anchor screw 9 can be easily fixed to the chimney body 3 by a so-called retrofitting method. , The screw head 9 of the anchor screw 9
The panel piece 7a can be securely fixed to the inner surface 3a of the chimney body 3 by b, and the injected adhesive 8 causes the gap 15 between the screw head 9b and the panel piece 7a and the chimney body 3 and the panel piece 7a. Since it also enters the gap 15 between the inner surface 3a and the inner surface 3a of the chimney body 3, the panel piece 7a can be integrally bonded to the inner surface 3a, and rainwater can penetrate into the through hole 13. Can be prevented.

The fixed frame 10 is made of engineering plastic and is formed in a T-shaped cross section as shown in FIG.
0a, which includes a protrusion 10b protruding from the protrusion 0a.
A taper surface 10c is formed on the outer peripheral surface of the tip portion of 0b so as to spread outward toward the tip, and is bonded to the strip plate portion 10a and the projection portion 10b at predetermined intervals along the longitudinal direction of the strip plate portion 10a. The agent injection hole 17 is provided therethrough.

A joint groove 19 is formed on the inner surface 3a of the chimney body 3 along the joint 18 between the panel pieces 7a. According to the above configuration, after the panel piece 7a is arranged on the inner surface 3a of the chimney body 3, the protruding portion 10b of the fixed frame 10 is arranged.
Is inserted into the joint groove 19 through the joint 18 and the adhesive is injected from the adhesive injection hole 17 to fix the fixed frame 1
0 can be easily fixed to the chimney body 3 by a so-called retrofitting method, and the band plate portion 10a of the fixed frame 10 can be easily fixed.
With this, the peripheral edge of the panel piece 7a can be securely fixed to the inner surface 3a of the chimney body 3, and the injected adhesive 8 causes the gap 15 between the strip plate portion 10a and the panel piece 7a and the chimney body 3 and the panel. Since it also enters the gap 15 between the piece 7a and the inner surface 3a of the chimney main body 3, the unevenness of the inner surface 3a can be absorbed, and the panel piece 7a can be integrally bonded to the inner surface 3a. It can prevent infiltration.

A procedure for repairing the inner surface 3a of the chimney body 3 will be described. On the inner surface 3a of the chimney body 3, joint grooves 19 facing the joints 18 between the panel pieces 7a and the panel pieces 7 are formed.
A plurality of screw holes 14 facing the through holes 13 formed in a are formed, and a plurality of panel pieces 7a are formed on the inner surface 3a of the chimney body 3.
Are sequentially arranged and the screw body 9a of the anchor screw 9
After being inserted into the screw hole 14 through the through hole 13 of each panel piece 7a, the adhesive 8 is injected into the adhesive injection hole 12 of the anchor screw 9, and the adhesive 8 is filled in the screw hole 14. As a result, the anchor screw 9 is fixed to the chimney body 3, and the panel piece 7a is fixed to the inner surface 3a of the chimney body 3 by the screw head 9b of the anchor screw 9. Further, the adhesive 8 is injected into the gap 15 between the panel piece 7a and the chimney body 3. Further, after inserting the protruding portion 10b of the fixed frame 10 into the joint groove 19 through the joint 18, the adhesive 8 is injected into the adhesive injection hole 17 of the fixed frame 10, and the joint 8 is filled with the adhesive 8. To do. As a result, the fixed frame 10 is fixed to the chimney body 3, and the peripheral portion of the panel piece 7a is fixed to the inner surface 3a of the chimney body 3 by the strip plate portion 10a of the fixed frame 10.

According to the above construction, each panel piece 7a can be easily and reliably fixed to the inner surface 3a of the chimney body 3 by using the anchor screw 9 and the fixing frame 10, and in particular, the inner surface of the existing chimney is repaired. In this case, since the chipping work can be omitted, the repair work can be easily performed.

In the above embodiment, the case where the reinforcing bars 4 are not arranged in the concrete chimney main body 3 has been described as an example, but the concrete chimney main body 3 in which the reinforcing bars 4 are arranged.
Can also be applied.

[0031]

According to the present invention as set forth in claim 1, since the inner surface of the concrete chimney body is protected by the fiber reinforced plastic panel so that the exhaust gas does not contact the inner surface of the chimney body, The deterioration of the chimney body can be prevented and the life of the chimney can be maintained for a long time, and the panel has high heat insulation, so the thickness of the chimney body can be made thinner than before, which is economical. .

According to the second aspect of the invention, the aluminum foil interposed in the central portion of the panel enhances heat insulation by reflecting heat, so that it can be used like a chimney for a power station that is inactive at night. Even if it receives high heat intermittently, the thermal stress on the inner surface of the chimney body can be reduced to prevent deterioration,
Further, since the moisture is blocked by the aluminum foil so that moisture does not come into contact with the inner surface of the chimney body, deterioration of the panel adhesive can be prevented.

According to the third aspect of the present invention, it is possible to prevent the inner surface of the chimney body from being deteriorated by improving heat resistance and heat insulating property by the alumina fiber. According to the invention as set forth in claim 4, it is possible to prevent the inner surface of the chimney body from being deteriorated by increasing the heat insulating property by the ceramic, and at the same time, the granular ceramic is sprayed and fixed to the outer peripheral surface of the panel. By forming the unevenness on the outer peripheral surface, the panel can be reliably bonded to the inner surface of the chimney body via the adhesive.

According to the fifth aspect of the invention, the panel is divided into a plurality of panel pieces. Therefore, when the panel is damaged, only the damaged panel piece needs to be replaced, which is economical. Moreover, each panel piece can be reliably fixed to the inner surface of the chimney body by the anchor screw.

According to the invention of claim 6, after the panel piece is arranged on the inner surface of the chimney body, the screw body of the anchor screw is inserted into the screw hole of the chimney body through the through hole of the panel piece, and the anchor is formed. By injecting the adhesive into the screw hole through the adhesive injection hole of the screw, the anchor screw can be easily fixed to the chimney body by a so-called retrofitting method, and the panel piece is fixed by the head of the anchor screw. It can be securely fixed to the inner surface of the chimney body.

According to the invention described in claim 7, after the panel piece is arranged on the inner surface of the chimney body, the protruding portion of the fixed frame is inserted into the joint groove through the joint between the panels, and the fixed frame is bonded. By injecting the adhesive into the joint groove through the agent injection hole, the fixed frame can be easily fixed to the chimney body, and the strip plate part of the fixed frame makes the peripheral edge of the panel piece to the inner surface of the chimney body. It can be fixed securely and rainwater can be prevented from entering the joint.

According to the invention described in claim 8, each panel can be easily and surely fixed to the inner surface of the chimney main body by using the anchor screw and the fixing frame. Especially, when repairing the inner surface of the existing chimney. It is suitable.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a chimney that is an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view of the same main part.

FIG. 3 is a partially cutaway perspective view of a panel portion of the main part.

FIG. 4 is a vertical cross-sectional view of the vicinity of an anchor screw of the main part.

FIG. 5 is a vertical cross-sectional view of the main part near the fixed frame.

FIG. 6 is a perspective view of the entire chimney.

FIG. 7 is a perspective view of a main part of a chimney which is an example of the related art.

FIG. 8 is a perspective view of a main part of a chimney which is another conventional example.

[Explanation of symbols]

 3 Concrete chimney body 7 Fiber reinforced plastic panel 7a Panel piece 7B Aluminum foil 7C Alumina fiber 7D Ceramic 8 Adhesive 9 Anchor screw 9a Anchor screw screw body 9b Anchor screw screw head 10 Fixed frame 10a Fixed frame strip Part 10b Projection part of fixed frame 12 Adhesive injection hole 13 Through hole 14 Screw hole 17 Adhesive injection hole 18 Joint 19 Joint groove

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenichi Hamada, 3-5-28 Nishikujo, Konohana-ku, Osaka City, Osaka Prefecture, Hitachi Shipbuilding Co., Ltd. (72) Toshiya Hamanaka, 5-chome, Nishikujo, Konohana-ku, Osaka No. 28 in Hitachi Shipbuilding Co., Ltd.

Claims (8)

[Claims] 1. A chimney characterized in that a panel made of fiber reinforced plastic is attached to the inner surface of a main body of the concrete chimney. 2. The chimney according to claim 1, wherein an aluminum foil is sandwiched in the center of the panel. 3. A chimney according to claim 1, wherein alumina fibers are interposed on the inner surface side of the panel. 4. The chimney according to claim 1, wherein a ceramic is interposed on the outer surface side of the panel. 5. The panel is divided into a plurality of panel pieces,
The chimney according to any one of claims 1 to 4, wherein each panel piece is fixed to the inner surface of the chimney body by an anchor screw protruding from the inner surface of the chimney body. 6. The anchor screw has a screw body and a screw head portion projecting from a base end portion of the screw body, and the chimney passes through a through hole penetrating the screw body into the panel piece. It is fixed to the chimney body by being inserted into a screw hole formed on the inner surface of the main body and being injected into the screw hole through an adhesive injection hole penetrating the screw head and the screw body. The chimney according to claim 5, characterized in that 7. A T-shaped cross section having a joint groove formed on the inner surface of the chimney main body along joints between the panel pieces and comprising a strip plate portion and a projection portion projecting from the strip plate portion. By inserting the protrusion of the fixed frame into the joint groove through the joint, and by injecting the adhesive into the joint groove through the adhesive injection hole penetrating the strip and the protrusion, The chimney according to claim 5 or 6, wherein the projection is fixed to the chimney body, and the peripheral edge of each panel piece is fixed to the inner surface of the chimney body by the strip plate. 8. A method of constructing a chimney in which a plurality of fiber-reinforced plastic panel pieces are attached to the inner surface of a concrete chimney body, wherein a joint groove facing the joint between the panel pieces is provided on the inner surface of the chimney body. A plurality of screw holes facing the through holes penetrating each panel piece are formed, and a plurality of panel pieces are sequentially arranged on the inner surface of the chimney body, and the screw body and the base end portion of the screw body project. And fixing the panel piece to the inner surface of the chimney body by fitting the screw body of a plurality of anchor screws having the screw head into the screw hole through the through hole of each panel piece. By fitting the protruding portion of the fixed frame having a substantially T-shaped cross section in the joint groove, which comprises the belt plate portion and the protruding portion projecting from the belt plate portion, the panel portion of each panel piece is fitted by the belt plate portion. Secure the periphery to the chimney body Construction method for a chimney, characterized and.