JP7573376B2 - Exhaust tower structure - Google Patents

Description

The present invention relates to an exhaust tower-like structure.

Chimneys are known in which the upper part of the tube body has a smaller diameter than the lower part (see, for example, Patent Documents 1 and 2). The tube body disclosed in Patent Document 1 is made of FRP (fiber reinforced plastic).

Japanese Unexamined Patent Publication No. 15339/1983 Japanese Patent Application Publication No. 11-239715

However, in collective chimneys and collective exhaust stacks, there is a demand to improve the exhaust efficiency of the stack body while ensuring the number of exhaust ducts that can be connected to the stack body.

Taking the above facts into consideration, the present invention aims to improve the exhaust efficiency of the barrel while ensuring the number of exhaust ducts that can be connected to the barrel.

The exhaust tower-like structure according to the first aspect includes a resin cylindrical body having an upper portion thinner than a lower portion, and a plurality of exhaust ducts connected to the lower portion of the cylindrical body.

According to the exhaust tower-like structure of the first aspect , a plurality of exhaust ducts are connected to the lower part of the cylindrical body. As a result, exhaust gas is discharged from the plurality of exhaust ducts to the lower part of the cylindrical body. The exhaust gas rises along the upper part of the cylindrical body and is discharged to the outside of the cylindrical body.

Here, the upper part of the barrel is thinner than the lower part of the barrel. In other words, the lower part of the barrel is thicker than the upper part of the barrel. By making the lower part of the barrel to which the exhaust ducts are connected thicker in this way, it is possible to ensure the number of exhaust ducts that can be connected to the barrel.

Also, as mentioned above, the upper part of the barrel is thinner than the lower part. This increases the flow rate of the exhaust gas flowing from the bottom to the top of the barrel, improving the exhaust efficiency of the barrel.

In this way, the present invention can improve the exhaust efficiency of the barrel while ensuring the number of exhaust ducts that can be connected to the barrel.

Furthermore, the barrel is made of resin. This, for example, suppresses corrosion of the barrel, thereby increasing its durability.

The exhaust tower-like structure of the second aspect is the exhaust tower-like structure of the first aspect , wherein a tapered section made of resin is provided between the lower and upper parts of the tube body, the tapered section becoming thinner from the lower part side to the upper part side.

According to the exhaust tower-like structure of the second aspect , a tapered portion is provided between the lower and upper portions of the cylindrical body. The tapered portion becomes thinner from the lower side to the upper side of the cylindrical body. This tapered portion makes it easier for exhaust gas discharged from the multiple exhaust ducts to flow to the upper portion of the cylindrical body. Therefore, the exhaust efficiency of the cylindrical body is further improved.

An exhaust tower-like structure according to a third aspect is the exhaust tower-like structure according to the second aspect , in which a reinforcing rib extending from the lower side to the upper side of the cylindrical body is provided on the outer circumferential surface of the tapered portion.

According to the exhaust tower-like structure of the second aspect , a reinforcing rib extending from the lower side to the upper side of the tube body is provided on the outer circumferential surface of the tapered portion, thereby suppressing damage to the tapered portion.

As described above, the exhaust tower-like structure of the present invention can improve the exhaust efficiency of the barrel while ensuring the number of exhaust ducts that can be connected to the barrel.

FIG. 1 is a perspective view showing an exhaust tower-like structure according to an embodiment. FIG. 2 is a side view showing the exhaust tower-like structure shown in FIG. 1 . FIG. 3 is a plan view showing the base portion shown in FIG. 2 . FIG. 3 is a plan view showing the connecting stage shown in FIG. 2 . FIG. 3 is an enlarged side view showing the lower barrel, the tapered portion, and the upper barrel shown in FIG. 2 . This is a cross-sectional view taken along line 6-6 in Figure 5. This is a cross-sectional view taken along line 7-7 in Figure 5. This is a cross-sectional view taken along line 8-8 in Figure 5. FIG. 3 is a side view showing a construction process of the exhaust tower-like structure shown in FIG. 2 . FIG. 3 is a side view showing a construction process of the exhaust tower-like structure shown in FIG. 2 . FIG. 3 is a side view showing a construction process of the exhaust tower-like structure shown in FIG. 2 . FIG. 3 is a side view showing a construction process of the exhaust tower-like structure shown in FIG. 2 .

Below, we will explain an exhaust tower-like structure according to one embodiment with reference to the drawings.

(Exhaust tower structure)
1 and 2 show an exhaust tower-like structure 10 according to this embodiment. The exhaust tower-like structure 10 includes a tower-like body 20 and a tube body 50.

(Tower-shaped body)
The tower-like body 20 is, for example, a steel tower that supports a tube body 50 described later and suppresses the collapse of the tube body 50. The tower-like body 20 is formed in a rectangular column shape that becomes thinner toward the top, and is installed on an installation surface 12 such as a foundation. The tower-like body 20 is arranged on the outer periphery and has a plurality of columns 22 erected on the installation surface 12, and a plurality of outer periphery beams 24 and braces 26 that are installed on the plurality of columns 22. The tower-like body 20 is not limited to a rectangular column shape, and may be, for example, a polygonal column shape or a cylindrical shape.

As shown in FIG. 2, the tower-shaped body 20 has a base 30, a number of legs 36, and a tower-shaped portion 40. The base 30 is provided at the bottom of the tower-shaped body 20. The base 30 is formed in a base shape (floor shape) on which the tube body 50 described below can be placed.

As shown in FIG. 3, the base 30 has a number of outer perimeter beams 24 joined together in a frame-like shape in plan view, a number of beams 32 that are erected on the opposing outer perimeter beams 24 and joined together in a lattice-like shape in plan view, horizontal braces 34 that reinforce the lattice frame, and support beams 35 that support the tube body 50.

As shown in FIG. 2, the base 30 is disposed above the installation surface 12, and forms a usable space 14 between the base 30 and the installation surface 12. The usable space 14 is, for example, a space where people can enter and exit. This usable space 14 is used, for example, as a passageway for bringing in materials, a temporary storage area for materials, or a parking lot during the construction of the exhaust tower-like structure 10, or as a maintenance space or a parking lot after the construction of the exhaust tower-like structure 10.

The legs 36 extend downward from the outer periphery of the base 30 and support the base 30 from below against the installation surface 12. The legs 36 are also arranged on the outer periphery of the usable space 14. The usable space 14 is an example of a space.

The tower-shaped portion 40 extends upward from the base portion 30. This tower-shaped portion 40 is provided with a plurality of connecting stages 42. The connecting stages 42 are arranged at intervals in the height direction of the tower-shaped portion 40.

As shown in FIG. 4, the connecting stage 42 is a lattice-like floor formed around the tube body 50 described below. This connecting stage 42 has a number of outer perimeter beams 24 joined together in a frame-like shape in plan view, a number of beams 44 that are installed on the opposing outer perimeter beams 24 and joined together in a lattice-like shape in plan view, horizontal braces 46 that reinforce the lattice frame, and beam supports 47 that receive the horizontal force of the tube body 50.

A rectangular opening 48 is formed in the center of the connecting stage 42 in a plan view. A tube body 50 is placed in this opening 48. A connecting ring 51 is provided on the outer periphery of this tube body 50. This connecting ring 51 and the support beam 47 of the connecting stage 42 are connected via a bracket 49. This allows the tube body 50 to be supported on the tower body 20 via multiple connecting stages 42. Note that stairs, ladders, etc. (not shown) are installed on adjacent connecting stages 42.

(Barrel)
1, the cylinder body 50 is a collective exhaust stack or a collective chimney to which a plurality of exhaust ducts 16 are joined. The cylinder body 50 is formed into a cylindrical shape as a whole.

As shown in FIG. 2, the tube body 50 is erected on the base portion 30 of the tower-shaped body 20. The aforementioned usable space 14 is formed below the tube body 50. The tube body 50 is also disposed within the tower-shaped portion 40 of the tower-shaped body 20, and is connected to the aforementioned multiple connecting stages 42.

As shown in FIG. 1, a number of exhaust ducts 16 are connected to the lower part of the cylinder body 50. Exhaust gas supplied from these exhaust ducts 16 into the cylinder body 50 rises along the cylinder body 50 and is exhausted from an exhaust port 50A formed at the upper end of the cylinder body 50. The lower end of the cylinder body 50 is closed by a bottom 50B. The exhaust ducts 16 are not shown in FIG. 2.

Here, the barrel 50 is formed from FRP (fiber reinforced plastic), such as GFRP (glass fiber reinforced plastic) or CFRP (carbon fiber reinforced plastic). FRP is lighter than metal and has excellent corrosion resistance against exhaust gas and acid resistance. This reduces the weight of the barrel 50 and increases its durability.

The barrel 50 has a lower barrel 52, an upper barrel 54, and a tapered portion 60. As shown in FIG. 5, the lower barrel 52 is formed in a cylindrical shape with a constant diameter D1, and constitutes the lower portion (large diameter portion) of the barrel 50. The lower barrel 52 is also connected to the multiple exhaust ducts 16 (see FIG. 1) described above. The lower barrel 52 is an example of the lower portion of the barrel 50.

The upper body 54 is formed into a cylindrical shape with a constant diameter D2, and constitutes the upper part (small diameter part) of the body 50. The diameter D2 of the upper body 54 is smaller than the diameter D1 of the lower body 52 (D2<D1). In other words, the upper body 54 is thinner than the lower body 52. The upper body 54 is an example of the upper part of the body 50.

The tapered portion 60 is a reducer (reducer portion) that connects the lower tube body 52 and the upper tube body 54, which have different diameters. This tapered portion 60 is formed in a truncated cone shape with a diameter that decreases from the lower tube body 52 side toward the upper tube body 54 side. The tapered portion 60 is also formed in a hollow (cylindrical) shape, with both axial ends open.

The lower end of the tapered section 60 is connected to the upper end of the lower tube body 52. Meanwhile, the upper end of the tapered section 60 is connected to the lower end of the upper tube body 54. The diameter of the upper end of the tapered section 60 is smaller than the diameter of the lower end of the tapered section 60. This tapered section 60 increases the flow rate of the exhaust gas flowing from the lower tube body 52 to the upper tube body 54.

As shown in Figures 5, 6, and 7, the lower end of the tapered portion 60 is reinforced by a lower reinforcing ring 62. The lower reinforcing ring 62 is formed in a ring shape that conforms to the outer peripheral surface (side peripheral surface) 60S of the lower end of the tapered portion 60. The lower reinforcing ring 62 is made of metal, formed in a cylindrical shape with a rectangular cross section, and attached to the outer peripheral surface 60S of the tapered portion 60.

The upper end of the tapered portion 60 is reinforced by an upper reinforcing ring 64. The upper reinforcing ring 64 is formed in a ring shape that conforms to the outer peripheral surface 60S of the upper end of the tapered portion 60. The upper reinforcing ring 64 is made of metal, formed in a cylindrical shape with a rectangular cross section, and attached to the outer peripheral surface 60S of the tapered portion 60.

The outer peripheral surface 60S of the tapered portion 60 is reinforced by a number of reinforcing ribs 66. The reinforcing ribs 66 span the lower reinforcing ring 62 and the upper reinforcing ring 64. The reinforcing ribs 66 are also spaced apart in the circumferential direction of the tapered portion 60.

As shown in FIG. 8, the reinforcing rib 66 is made of metal such as steel plate and is formed into a cylindrical shape with a rectangular cross section. The reinforcing rib 66 is fixed to the outer peripheral surface 60S of the tapered portion 60 by a coating layer 68.

The coating layer 68 is, for example, a resin layer formed from FRP. The coating layer 68 also covers the outer peripheral surface 60S of the tapered portion 60 from above the reinforcing rib 66, and is fixed to the outer peripheral surface 60S of the tapered portion 60 on both sides of the reinforcing rib 66 by welding or the like. The metal reinforcing rib 66 is fixed to the FRP tapered portion 60 by this coating layer 68.

The reinforcing rib 66, the lower reinforcing ring 62, and the upper reinforcing ring 64 are not limited to being made of metal, and may be made of resin. The size and shape of the reinforcing rib 66, the lower reinforcing ring 62, and the upper reinforcing ring 64 can also be changed as appropriate.

The reinforcing rib 66 may be fixed to the outer peripheral surface 60S of the tapered portion 60 by other fixing methods such as adhesive, not limited to the coating layer 68.

As shown in FIG. 2, the body 50 has multiple body pieces 50P that are divided in the height direction. Each body piece 50P is formed in a cylindrical shape. The body 50 is formed by connecting these body pieces 50P in the height direction. In this embodiment, the lower body 52 and the upper body 54 of the body 50 are each composed of multiple body pieces 50P, and the tapered portion 60 of the body 50 is composed of a single body piece 50P.

In this embodiment, the multiple barrel pieces 50P refer to multiple split pieces obtained by dividing the barrel 50 in the height direction. The shapes and sizes of the multiple split pieces do not have to be the same, and may be different. In this embodiment, for ease of explanation, the same reference numerals are used to denote multiple barrel pieces 50P that are different in size, etc.

(Construction method for exhaust tower structure)
Next, an example of a method for constructing the exhaust tower-like structure 10 according to this embodiment will be described.

As shown in FIG. 9, first, the tower-shaped body 20 is erected on the installation surface 12. Next, a temporary stand 70 is temporarily set up next to the tower-shaped body 20, and has approximately the same height (approximately the same height) as the pedestal portion 30. In addition, a transport device 72 is installed on the pedestal portion 30 and the temporary stand 70. The temporary stand 70 is an example of a stand.

The transport device 72 has rails (not shown) that span the temporary stand 70 and the base 30, a transport table 74 that is movably connected to the rails, and a drive source (not shown) such as a motor that moves the transport table 74 along the rails. The transport table 74 can move (slide) from the temporary stand 70 onto the base 30, and can also move (slide) from the base 30 onto the temporary stand 70.

The movement mechanism of the transport device 72 can be changed as appropriate. The drive source of the transport device 72 can be provided as needed and can be omitted as appropriate. Furthermore, the temporary stand 70 can be a permanent stand.

Next, as shown by the two-dot chain line in FIG. 9, the uppermost tube body piece 50P of the multiple tube body pieces 50P that make up the tube body 50 (see FIG. 2) is placed on the transport table 74 on the temporary stand 70. In this state, the transport table 74 is slid onto the base 30. This positions the uppermost tube body piece 50P on the base 30 as shown by the solid line in FIG. 9.

Next, as shown in FIG. 10, the uppermost tube body piece 50P is attached to the hanging member 82 of the lifting device 80, such as an electric chain block, attached to the connecting stage 42 at the top of the tower-like body 20 via the connecting bracket 84, and the tube body piece 50P is lifted up to a predetermined height. In this state, the transport table 74 is moved from above the base 30 to above the temporary stand 70.

Note that in Figures 9 to 12, only the connecting stage 42 to which the lifting device 80 is attached is shown, and the other connecting stages 42 are not shown.

Next, the second-tiered tube body piece 50P from the top of the tube body 50 (see FIG. 2) is placed on the conveying table 74. In this state, the conveying table 74 is slid onto the base 30. As a result, the second-tiered tube body piece 50P is positioned on the base 30 as shown by the two-dot chain line in FIG. 10. In this state, the lower end of the topmost tube body piece 50P and the upper end of the second-tiered tube body piece 50P are joined. At this time, the topmost tube body piece 50P is lowered by the lifting device 80, and the joint between the topmost tube body piece 50P and the second-tiered tube body piece 50P is appropriately positioned.

Next, the joined uppermost and second tiered body pieces 50P are lifted to a predetermined height by the lifting device 80. Next, by repeating the above procedure, the uppermost to lowermost body pieces 50P of the body 50 (see FIG. 2) are joined together as shown in FIG. 11 and FIG. 12.

As shown in FIG. 11, when the joined multiple tube body pieces 50P are lifted by the lifting device 80, the connecting bracket 84 attached to the tube body piece 50P is replaced with another tube body piece 50P arranged below as necessary. At this time, the connecting bracket 84 is attached to the tube body piece 50P above the center of gravity G1 of the multiple tube body pieces 50P to be lifted.

Similarly, in the example shown in FIG. 12, a connecting bracket 84 is attached to the tube body piece 50P that is above the center of gravity G2 of the multiple tube body pieces 50P to be lifted. This allows the multiple joined tube body pieces 50P to be lifted in a more stable state.

Next, with the formed tube body 50 hoisted by the lifting device 80, the transport table 74 is moved from above the base 30 to above the temporary stand 70. Next, the tube body 50 is lowered by the lifting device 80 and placed on the base 30. In this state, as shown in FIG. 2, the tube body 50 is connected to the multiple connecting stages 42 of the tower-shaped body 20. Also, if necessary, the lower end of the tube body 50 is fixed to the base 30. This completes the exhaust tower-shaped structure 10.

Next, multiple exhaust ducts 16 (see Figure 1) are connected to the lower tube body 52 (the lower part of the tube body 50) of the tube body 50. After that, the temporary stand 70 is removed.

In this manner, in this embodiment, the tube body 50 is formed by assembling multiple tube body pieces 50P on the pedestal portion 30 provided on the tower-shaped body 20. Also, in this embodiment, the tube body 50 is assembled by joining the tube body piece 50P that is lifted above the pedestal portion 30 to another tube body piece 50P that is arranged below the tube body piece 50P.

Here, when multiple tube body pieces 50P are stacked in order to form the tube body 50, once the height of the stacked tube body pieces 50P reaches a predetermined value or more, it becomes difficult to stack further tube body pieces 50P on top of them.

In contrast, in this embodiment, as described above, by placing another barrel piece 50P below the barrel piece 50P that is lifted above the base portion 30, a tall barrel piece 50 can be easily constructed.

Furthermore, in this embodiment, the transport device 72 transports another cylindrical body piece 50P from the temporary stand 70 to below the cylindrical body piece 50P that is lifted above the base 30. By using the transport device 72 in this manner, the workability of the cylindrical body piece 50P is improved.

The construction method for the exhaust tower-like structure 10 is not limited to the above-mentioned method, and steps may be rearranged or other steps may be added depending on the situation.

(effect)
Next, the effects of this embodiment will be described.

According to the exhaust tower-like structure 10 of this embodiment, a tube body 50 is disposed within the tower-like body 20. The tube body 50 is supported by the tower-like body 20. A usable space 14 is formed below the tube body 50. More specifically, the usable space 14 is formed below the base portion 30 that supports the tube body 50.

The usable space 14 is used, for example, as a passageway for bringing in materials, a temporary storage area for materials, or a parking lot during construction of the exhaust tower-like structure 10, or as a maintenance space or a parking lot after construction of the exhaust tower-like structure 10.

In this way, in this embodiment, by forming a usable space 14 below the tube body 50, it is possible to exhaust air from the tube body 50 while making effective use of the site.

In addition, multiple exhaust ducts 16 are connected to the lower cylinder body 52. This allows exhaust gas to be exhausted from the multiple exhaust ducts 16 to the lower cylinder body 52. This exhaust gas rises along the upper cylinder body 54 and is exhausted to the outside of the cylinder body 50 through the exhaust port 50A.

Here, the upper tube body 54 is thinner than the lower tube body 52. In other words, the lower tube body 52 is thicker than the upper tube body 54. By making the lower tube body 52, to which the exhaust ducts 16 are connected, thicker in this way, it is possible to ensure the number of exhaust ducts 16 that can be connected to the tube body 50.

As described above, the upper cylinder body 54 is thinner than the lower cylinder body 52. This increases the flow rate of exhaust gas flowing from the lower cylinder body 52 to the upper cylinder body 54, thereby improving the exhaust efficiency of the cylinder body 50. In particular, in this embodiment, a tapered portion 60 is provided between the upper cylinder body 54 and the lower cylinder body 52. The tapered portion 60 becomes thinner as it moves from the lower cylinder body 52 side to the upper cylinder body 54 side. This tapered portion 60 makes it easier for exhaust gas exhausted from the multiple exhaust ducts 16 to the lower cylinder body 52 to flow to the upper cylinder body 54. Therefore, the exhaust efficiency of the cylinder body 50 is further improved.

In this manner, in this embodiment, the exhaust efficiency of the tube body 50 can be improved while ensuring the number of exhaust ducts 16 that can be connected to the tube body 50.

The barrel 50 is made of FRP. This, for example, suppresses corrosion of the barrel 50, thereby improving the durability of the barrel 50. In addition, in this embodiment, the barrel 50 can be made lighter than a barrel 50 made of metal.

The tapered portion 60 is more susceptible to stress (bending stress) during an earthquake, etc., than the lower tube body 52 and the upper tube body 54. If the tapered portion 60 is made of FRP, there is a possibility that buckling, etc., will occur in the tapered portion 60.

To address this issue, in this embodiment, multiple metallic reinforcing ribs 66 are provided on the outer peripheral surface 60S of the tapered portion 60, extending from the lower tube body 52 side to the upper tube body 54 side. This allows the FRP tapered portion 60 to reduce the weight of the tube body 50, while the metallic reinforcing ribs 66 can efficiently prevent damage such as buckling of the tapered portion 60.

Furthermore, the reinforcing rib 66 is fixed to the outer peripheral surface 60S of the tapered portion 60 by a coating layer 68 that covers the outer peripheral surface 60S of the tapered portion 60 from above the reinforcing rib 66. This makes it possible to easily fix the metal reinforcing rib 66 to the FRP tapered portion 60 while suppressing corrosion of the reinforcing rib 66.

(Modification)
Next, a modification of the above embodiment will be described.

In the above embodiment, a usable space 14 that people can enter and exit is formed below the tube body 50. However, as an example of a space, an equipment space that is difficult for people to enter and exit but in which piping, etc. can be laid, may be formed below the tube body 50.

In the above embodiment, the barrel 50 is made of FRP. However, the barrel 50 may be made of a resin other than FRP. The barrel 50 is not limited to being made of resin, and may be made of metal.

In addition, in the above embodiment, multiple exhaust ducts 16 are connected to the tube body 50. However, at least one exhaust duct 16 can be connected to the tube body 50.

Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and one embodiment and various modified examples may be used in appropriate combination, and the present invention may of course be embodied in various forms without departing from the spirit of the present invention.

10 Exhaust tower structure 16 Exhaust duct 52 Lower tube body (lower part of tube body)
54 Upper tube body (upper part of the tube body)
60 Tapered portion 66 Reinforcing rib

Claims (3)

A tower-shaped body having a base portion below which a space is formed ;
A resin tubular body is disposed within the tower-shaped body, stands on the base portion, and is supported by the tower-shaped body , the upper portion of the resin tubular body being thinner than the lower portion of the resin tubular body;
A plurality of exhaust ducts connected to the lower portion of the cylindrical body above the base portion ;
An exhaust tower-like structure comprising: A tapered portion made of resin is provided between the lower portion and the upper portion of the cylindrical body, the tapered portion becoming thinner from the lower portion side toward the upper portion side.
The exhaust tower-like structure according to claim 1. A reinforcing rib is provided on the outer circumferential surface of the tapered portion, the reinforcing rib extending from the lower side to the upper side of the cylindrical body.
The exhaust tower-like structure according to claim 2.