JPH0258529B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a simple structure, easy installation,
Moreover, the present invention relates to a cylinder unit for a chimney inner cylinder that can prevent gas leakage and material corrosion, and a method for manufacturing the same.

Traditionally, chimneys emitted smoke at high temperatures (150 to 200 degrees Celsius), so corrosion of the concrete or steel materials was hardly considered. However, in recent years,
Flue gas desulfurization equipment began to be installed to prevent pollution, and it became necessary to remove SO _x and NO _x . In the case of the wet method, the exhaust gas outlet temperature of the exhaust gas deflow device is as low as 60 to 70℃, and _{the SO}
Because it is difficult to completely remove the water, the water droplets that adhere to the inner surface of the flue or chimney become concentrated and become a strongly acidic liquid, which tends to corrode conventional concrete or iron.

As a countermeasure against this corrosion, there are lining methods or methods of inserting a cylinder made of corrosion-resistant fiber-reinforced plastic (hereinafter referred to as FRP) into the existing chimney, but these methods have problems in terms of reliability (strength and safety, etc.) and construction period.
The FRP barrel insertion method is becoming more popular.

In general, the gap between the existing chimney and the FRP inner cylinder body must be as small as possible, so flange connection inside the chimney is not possible, so they are usually joined using a bell (socket) and spigot (insertion) method. That is, FIG. 1 is a schematic cross-sectional view showing a specific example of the conventional bell-and-spigot joining method, where a shows the state before joining and b shows the state after joining. 1 is a bell part, 2 is a barrel unit body, 3 is a spigot part, 4 is an adhesive, and 5 is a spigot part.
indicates the lower end face of the spigot part.

In this method, the spigot part 3 of the upper barrel unit is lowered into the bell part 1 of the lower barrel unit in the chimney, and adhesive 4 is filled between the bell part 1 and the spigot part 3 to bond them together. It is something to be glued. At this time, in order to inject the same unsaturated polyester resin or epoxy resin as the adhesive 4 used in manufacturing the barrel unit, a gap of about 2 to 10 mm is maintained between the bell part 1 and the spigot part 2. Due to this relationship, the adhesive 4 is not completely filled into this gap, and not only does gas leak from this area, but also the cut surface of the glass fiber in the FRP appears on the lower end surface 5 of the spigot. It is easily exposed and corrodes from this part.

In order to prevent this, the following improved joining method has been adopted. That is, FIG. 2 is a schematic cross-sectional view showing a specific example of the improved bell-and-spigot joining method, in which numerals 1 to 5 have the same meanings as in FIG. 1, and 6 indicates an inner layered portion. . This method involves inserting and gluing the spigot part 3 of the upper barrel unit into the bell part 1 of the lower barrel unit, and then applying FRP to the inner surface of the barrel so as to cover the lower end surface 5 of the spigot part 3. This forms the inner layered portion 6. However, especially in the case of a large-diameter chimney, not only does it take a considerable number of man-hours to form such an inner laminated part 6, but also the adhesive 4 is still insufficiently filled between the bell part 1 and the spigot part 3. The adhesion is not perfect.

The present invention was made to solve these problems, and its purpose is to eliminate the above-mentioned drawbacks (incomplete adhesion and poor workability), and to provide a product with a simple structure and good workability. Moreover, it is an object of the present invention to provide a cylinder unit for a chimney inner cylinder which can prevent gas leakage and material corrosion, and a method for manufacturing the same.

To summarize the present invention, the barrel unit for a chimney inner cylinder of the present invention (first invention) is a barrel unit for a chimney inner cylinder made of fiber-reinforced plastic. The pipe for a chimney inner cylinder of the present invention is characterized in that the part has a double tubular socket part, and the lower end part has an insertion part that can be inserted into the double tubular socket part and fixed by adhesive. A method for manufacturing a chimney body unit (second invention) is a method for manufacturing a chimney inner cylinder body unit made of fiber-reinforced plastic, in which the upper end of the cylinder body unit is shaped into a two-stage bell-shaped tube. The lower end is formed into a first-stage bell-shaped tube shape using a core metal, and then a short tube having the same inner diameter as the main body of the barrel unit is inserted into the upper end of the barrel unit to form the first-stage bell-shaped tube. Each bell-shaped tube is sized so that it can be glued and fixed to the inner surface of the pipe to form a double tubular socket, and the single-stage bell-shaped pipe insertion part at the lower end can be inserted and fixed to the double-tubular socket. The method for manufacturing a cylinder unit for a chimney inner cylinder of the present invention (third invention)
In the method for manufacturing a chimney inner cylinder unit made of fiber-reinforced plastic,
The lower end of the cylindrical unit is formed into a single-stage bell-shaped tube using a core metal, and then the 1-stage bell-shaped tube is adhesively fixed to the upper end of the cylindrical unit, and a mantle is provided to form a double-tubular receiver. Further, the present invention is characterized in that the mantle has a size that allows a single-stage bell-shaped tube insertion portion at the lower end to be inserted into the double tubular socket portion and fixed by adhesive. A method for manufacturing a cylinder unit for a chimney inner cylinder (fourth invention) is a method for manufacturing a cylinder unit for a chimney inner cylinder whose material is made of fiber-reinforced plastic, in which only the upper end of the cylinder unit is A one-stage bell-shaped tube is formed using a metal core, and then a short tube having an outer diameter smaller than the inner diameter of the barrel unit body is inserted into the upper end of the barrel unit to form the barrel unit. A one-stage bell is fixed to the inner surface of the upper end of the unit body to form a double tubular socket, and the lower end of the cylindrical unit body as it is is inserted into the double tubular socket and fixed with adhesive. It is characterized by forming a mold tube.

The barrel unit for the chimney inner cylinder of the present invention (hereinafter referred to as the barrel unit) consists of a barrel unit main body, a double tubular socket provided at the upper end, and a single-stage bell provided at the lower end as necessary. Consists of a mold tube insertion section (double wrap method). The double-tubular socket has a double-tube structure with a substantially U-shaped longitudinal section, into which the single-stage bell-shaped tube insertion portion of the upper barrel unit or the insertion portion of the barrel unit itself is inserted. It has the following dimensions and shape.

The plurality of barrel units are fixedly connected by the adhesive prefilled in the double tubular socket portion by the above-described insertion, and are stacked and fixed to a predetermined height of the chimney inner cylinder by a simple operation. With this configuration, by forming a uniform adhesive joint (without air bubbles or the like), it is possible to prevent leakage of exhaust gas in the chimney and corrosion of the material.

As will be explained in detail later, the cylindrical body unit of the present invention is manufactured by using a core metal in advance, for example, at the upper end.
A tiered bell-shaped tube is formed into a shape with a 1-tiered bell-shaped tube at the lower end, a barrel unit body at the center, and a short tube on the inner surface of the 1st-tiered bell-shaped tube of the 2-tiered bell-shaped tube at the upper end. It can be manufactured by gluing it to the outer surface to form a double tubular socket, or alternatively, it can be similarly formed using a metal core into a shape with a single bell-shaped tube only at the lower end, and then It is also possible to form the double tubular receptacle by adhesively fixing the inner surface of a separately manufactured single-stage bell-shaped tube to provide a jacket around the upper end barrel. Furthermore, the fourth invention may be adopted.

The type of adhesive used in the present invention is not particularly limited, and those conventionally used in the production of FRP chimney inner cylinders can be used as appropriate, and the above-mentioned unsaturated polyester resins or Epoquin resins are suitable.

Next, specific examples of the present invention will be described in detail with reference to the drawings.

FIG. 3 is a schematic cross-sectional view showing a specific example of the barrel unit of the present invention, in which 11 is a double tubular socket, 12 is a barrel unit body according to the present invention, and 13
indicates the first-stage bell-shaped tube insertion section, D ₁ is the inner diameter of the second-stage bell-shaped tube, D ₂ is the outer diameter of the first-stage bell-shaped tube insertion section,
D ₃ is the inner diameter of the first bell-shaped tube insertion part, D ₄ is the outer diameter of the short tube to be glued, D ₅ is the inner diameter of the barrel unit body,
D ₆ indicates the outer diameter of the barrel unit body.

The barrel unit shown in FIG. 3 includes a barrel unit main body 12 according to the present invention, a double tubular socket part 11 constituting its upper end, and a tubular socket 11 constituting its lower end.
It consists of a stepped bell-shaped tube insertion section 13. As will be described later, a plurality of these cylinder units are sequentially stacked and adhesively bonded to form a chimney inner cylinder, so the single-stage bell-shaped pipe insertion part 13 at the lower end is connected to the double-tubular socket at the upper end. The double tubular socket part 11 is inserted into the double tubular socket part 11.
The size is set such that it can be adhesively fixed to the inner surface of the double tubular socket part 11 with the adhesive filled therein.
To that end, the dimensions D ₁ to _{D 5} in Figure 3 are as follows:
It is desirable that D ₁ −D ₂ =4 to 20 mm and D ₃ −D ₄ = approximately 5 to 10 mm. The thickness of the FRP barrel unit pipe is approximately 3 to 30 mm, which varies depending on the size of the chimney cylinder, but by setting the above dimensions,
The gap between the double tubular socket part 11 and the first-stage bell-shaped tube insertion part 13, that is, the thickness of the adhesive layer, is uniform to about 2 to 10 mm on the outside of the first-stage bell-shaped pipe insertion part 13 and 2.5 to 5 mm on the inside. It is possible to completely prevent leakage of exhaust gas and corrosion of materials caused by exhaust gas. In addition, the heights of the first-stage bell-shaped tube insertion part 13 and the double-tubular socket part are approximately the same, and are approximately 150 to 200 mm.
By adjusting the amount of adhesive injected to about half that amount, a complete joint as described later can be formed.

The barrel unit shown in FIG. 3 can be manufactured as follows. That is, FIG.
Fig. 3 is a schematic cross-sectional view showing a specific example of the manufacturing process of the barrel unit shown in the figure, in which a is a barrel unit tube with bell-shaped tubes at both upper and lower ends, and b is an upper end of the barrel unit tube before joining the short tubes. , c shows the upper end of the cylindrical unit pipe after the short pipes are joined and further provided with the inner layered part, and
Reference numerals 11, 12 and 13 have the same meanings as in FIG.
The bell-shaped tube in the tier 16 is the bell-shaped tube in the second tier, 17
18 is a single-stage bell-shaped tube, 18 is an adhesive, 19 is an inner layered portion, and 20 is a short tube to be bonded.

In manufacturing this cylindrical unit, a core metal (that is, a mandrel) is prepared in advance into a mold that can be formed into a desired shape, for example, the shape shown in FIG. 4A, and this is used to manufacture the cylindrical unit tube. On this occasion,
The upper end and the lower end are formed to have the dimensions shown in FIG.
and a two-stage bell-shaped tube 14 having a second-stage bell-shaped tube 16, and the lower end thereof is constituted by a first-stage bell-shaped tube 17 having a first-stage bell-shaped tube insertion part 13. A cylindrical unit tube including the unit body 12 is manufactured. Next, in order to form the double tubular socket part 11 at the upper end, as shown in FIG. Apply 18,
Further, a short tube 20 coated with adhesive 18 in advance is inserted into the two-stage bell-shaped tube 14, and is bonded to the inner surface of the first-stage bell-shaped tube 15, as shown in FIG. 4c. [See Figure 4 b and c] In this way,
A double tubular receptacle 11 as shown in FIG. 3 can be formed.

At this time, the tube unit body 1 according to the present invention is further coated on the inner surface of the tube so as to cover the joint between the short tube 20 and the tube body unit body 12 according to the present invention.
By providing the inner layered portion 19 made of the same material as 2, the joint can be reinforced and gas leakage and material corrosion can be more completely prevented.

In the present invention, the barrel unit (particularly the double tubular socket) shown in FIG. 3 can be manufactured by another method. That is, only the lower end of the barrel unit is formed into a single-stage bell-shaped tube using a core metal, and the inner surface of a separately manufactured single-stage bell-shaped tube is glued around the upper end of the barrel. By providing a fixed jacket, a double tubular receptacle can be easily formed.

(Drawings omitted) In this case, the dimensions of the mantle are such that the one-stage bell-shaped tube insertion part at the lower end can be inserted into the double-tubular socket and fixed with adhesive, as shown in Figure 3. It is necessary to set it to .

According to the present invention, a chimney inner cylinder of a predetermined height can be manufactured by stacking a plurality of cylinder units and inserting and joining them. That is, FIG. 5 is a schematic cross-sectional view showing a specific example of the method of joining two cylindrical units according to the present invention. Injected state, c indicates after bonding, and symbols 11 to 13 and 18
have the same meaning as in FIG. 3, and 21 indicates a joint. When inserting and joining the barrel unit, the upper barrel unit is suspended above the lower barrel unit [Fig. 5a], and then glued into the double tubular socket 11 of the lower barrel unit. At the same time as the agent 18 is injected, the upper barrel unit is lowered (FIG. 5b), and the bell-shaped tube insertion portion 1 of the upper barrel unit is inserted into the double tubular socket 11 of the lower barrel unit.
3 is gradually inserted and bonded to complete the joining of the joining portion 21 [Fig. 5c]. At this time, in order to facilitate the insertion, a notch (not shown) may be provided on the inside of the tube at the top of the double tubular socket 11 to facilitate the insertion.

In connection with the above specific examples, especially the systems shown in FIGS. 3 to 5, the following systems shown in FIGS. 6 to 8 may be adopted. That is, FIG. 6 is a schematic cross-sectional view showing another specific example of the barrel unit of the present invention, in which 31 is a double tubular socket, 32 is a barrel unit body according to the present invention, and 33 is a barrel unit body according to the present invention. The insertion portion of the barrel unit body is shown.

The barrel unit shown in FIG. 6 comprises a barrel unit main body 32 according to the present invention, a lower end 33 thereof, and a double tubular receptacle 31 constituting its upper end.

The barrel unit shown in FIG. 6 can be manufactured as follows. That is, FIG. 7 is a schematic cross-sectional view showing a specific example of the manufacturing process of the barrel unit shown in FIG. The upper end of the cylindrical unit tube before pipe joining, c indicates the upper end of the cylindrical unit tube after joining the short pipes and further provided with an inner surface layer, numeral 34 is a single-stage bell-shaped tube, 35 is an adhesive, and 36 is an adhesive. The short tube to be bonded, 37, indicates the inner layered portion.

The feature of this barrel unit is that it is only necessary to provide a double tubular socket 31 at the upper end thereof, and in manufacturing it, the barrel unit according to the present invention is attached to the inner surface of the barrel of the single-stage bell-shaped tube. As shown in FIG. 7c, a short tube 36 having an outer diameter smaller than the inner diameter of the main body 32 and preferably a thinner thickness is attached to the inner surface of the upper end of the cylindrical unit main body 32 according to the present invention. A simple operation such as adhesive fixation is sufficient. It goes without saying that in this case as well, the inner laminated portion 37 can be provided for reinforcement, as in the case shown in FIG. 4c. Although the upper end of the barrel unit protrudes a little inside the barrel, by making the thickness of the short tube 36 to be bonded considerably thinner, the obstruction to smoke exhaust can be made negligible.

A chimney inner cylinder of a predetermined height can be manufactured by stacking a plurality of cylinder units and inserting and joining them, respectively, by the same operation as shown in FIG. 5. Figure 8 is a schematic cross-sectional view showing a specific example of the method of joining two cylindrical units of this type, in which a shows adhesive before joining, and b shows adhesive injected into the double tubular socket immediately before joining. c shows the state after joining, numerals 31 to 33 and 35 have the same meanings as in FIG. 6, and 38 shows the joined part. Insertion and joining of the barrel unit can be carried out by the same operations as in the case shown in FIG. 5, so a description thereof will be omitted.

As explained above, according to the barrel unit of the present invention, an adhesive is injected into the double tubular socket portion having a substantially U-shaped longitudinal section, and an insertion portion of the bell-shaped tube or the main body is inserted into the double tubular socket portion. It is easy to operate and has good workability as all you have to do is insert it. In addition, the adhesive is evenly distributed within the gap (clearance) of the insertion part of the double tubular socket, and no air bubbles enter the adhesive.
A perfect joint can be formed, which completely prevents gas leakage and material corrosion as in conventional systems.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view showing a specific example of the conventional bell and spigot joining method, Fig. 2 is a schematic sectional drawing showing a specific example of the improved bell and spigot joining method, and Fig. 3 4 is a schematic cross-sectional view showing a specific example of the barrel unit of the present invention, FIG. 4 is a schematic cross-sectional view showing a specific example of the manufacturing process of the barrel unit of FIG. 3, and FIG. FIG. 3 is a schematic cross-sectional view showing one specific example of the joining method of the barrel unit, FIG. 6 is a schematic cross-sectional view showing another specific example of the barrel unit of the present invention, and FIG. FIG. 8 is a schematic cross-sectional view showing a specific example of the manufacturing process of the barrel unit shown in FIG. 1...bell part, 2...tube unit body, 3...
...spigot part, 4...adhesive, 5...lower end surface of spigot part, 6...inner surface layer part, 11, 31
...Double tubular socket part, 12, 32...Cylinder unit main body according to the present invention, 13...1-stage bell-shaped tube insertion part, 14...2-stage bell-shaped tube, 15...1st-stage bell Shaped pipe, 16...Second stage bell-shaped pipe, 17, 34
...Single-stage bell-shaped tube, 18,35...Adhesive in the present invention, 19,37...Inner layered portion in the present invention, 20,36...Short tube to be bonded, 21,3
8... Joint portion in the present invention, 33... Tube unit main body insertion portion according to the present invention, D ₁ ... Inner diameter of second-stage bell-shaped tube, D ₂ ... Outer diameter of first-stage bell-shaped tube insertion portion , D ₃ ...Inner diameter of the first stage bell tube insertion part, D ₄ ...
...Outer diameter of the short pipe to be glued, D ₅ ...Inner diameter of the barrel unit body, D ₆ ...Outer diameter of the barrel unit body.

Claims (1)

[Scope of Claims] 1. In a chimney inner cylinder barrel unit made of fiber-reinforced plastic, the upper end of the barrel unit has a double tubular socket, and the lower end has a double tubular socket. A cylindrical unit for a chimney inner cylinder, characterized by having an insertion part that can be inserted into a tubular socket and fixed by adhesive. 2. The barrel unit for a chimney inner cylinder according to claim 1, wherein the lower end of the barrel unit has a bell-shaped insertion portion that can be inserted into and adhesively fixed to the double tubular socket at the upper end. 3. The chimney inner cylinder according to claim 1, wherein the lower end of the cylinder unit has an insertion part that can be inserted into the double tubular socket at the upper end and fixed by adhesive, as is the case with the cylinder unit main body. Tube unit. 4. In a method for manufacturing a chimney inner cylinder unit made of fiber-reinforced plastic,
Forming the upper end of the barrel unit into a two-stage bell-shaped tube shape and the lower end into a single-stage bell-shaped tube shape using a core metal,
Next, a short tube having the same inner diameter as the main body of the barrel unit is inserted into the upper end of the barrel unit and fixed to the inner surface of the first stage bell-shaped tube to form a double tubular socket, and A method for manufacturing a cylinder unit for a chimney inner cylinder, characterized in that each bell-shaped pipe is formed to a size that allows a single-stage bell-shaped pipe insertion part at the lower end to be inserted and adhesively fixed into the double-tubular socket part. 5. The method according to claim 4, wherein after the short tube is adhesively fixed to the inner surface of the first-stage bell-shaped tube, an inner surface layer is provided to cover the joint between the short tube and the barrel unit main body. A method of manufacturing a cylinder unit for a chimney inner cylinder. 6. In a method for manufacturing a chimney inner cylinder barrel unit made of fiber-reinforced plastic,
The lower end of the cylindrical body unit is molded into a single-stage bell shape using a cored metal, and then a 1-stage bell-shaped pipe is adhesively fixed to the upper end of the cylindrical body unit, a mantle is provided, and a double-tubular socket is formed. A cylinder body for a chimney inner cylinder, characterized in that the outer mantle is set to a size that allows a single-stage bell-shaped pipe insertion part at the lower end to be inserted into the double-tubular socket part and fixed by adhesive. How to manufacture the unit. 7. In a method for manufacturing a chimney inner cylinder unit made of fiber-reinforced plastic,
Only the upper end of the barrel unit is formed into a single-stage bell-shaped tube shape using a core metal, and then a short tube having an outer diameter smaller than the inner diameter of the barrel unit body is formed into the barrel unit. A double tubular socket is formed by inserting it into the upper end, and adhesively fixing it to the inner surface of the upper end of the barrel unit main body, and inserting the lower end of the barrel unit as it is into the double tubular socket. A method for manufacturing a cylinder unit for a chimney inner cylinder, characterized by forming a one-stage bell-shaped pipe to a size that allows it to be fixed with adhesive. 8. The chimney according to claim 7, wherein after the short pipe is adhesively fixed to the inner surface of the upper end of the cylindrical unit body, an inner surface layer is provided to cover the joint between the short pipe and the cylindrical unit body. A method for manufacturing a barrel unit for an inner cylinder.