JP2023096458A - Chimney for building and leg-part thereof - Google Patents

Abstract

To reduce the weight of a leg part of a chimney for a building and to prevent water from infiltrating into the leg part from a crack.SOLUTION: A leg part 20 of a chimney 10 for a building is installed on a skeleton floor 4 of a building 1. A chimney body 11 is erected from the leg part 20. A chimney bottom pan 30 is stretched inside a peripheral wall 22 of the leg part 20. The chimney bottom pan 30 is composed of a metal plate.SELECTED DRAWING: Figure 2

Description

The present invention relates to chimneys, and more particularly to chimney bottom structures attached to buildings.

Generally, a building having a boiler, a generator, etc. is equipped with a chimney for discharging exhaust gas (see Patent Document 1, etc.). The legs forming the bottom of this type of chimney are attached to the building frame floor. The chimney body rises from the legs.

The outer periphery of the leg is configured by a steel peripheral wall. The interior of the perimeter wall is loaded with castable refractories. The upper surface of the castable refractory, ie, the upper surface of the leg, is formed with a drainage slope that descends toward the drainage port.

JP 2016-056633 A

The castable refractory in the leg of a building chimney has a high specific gravity and a volume that occupies almost the entire interior of the leg. For this reason, the legs are heavy, and not only is it difficult to carry them out of the factory and install them at the construction site, but the load on the frame floor that supports the installed legs is large. In some cases, it may be necessary to increase the number of reinforcing bars or increase the thickness of the concrete slab that constitutes the building frame floor.
In addition, castable refractories are prone to cracking due to aged deterioration. As a result, water tends to seep into the inside of the castable refractory from the cracks and accumulate inside, which may cause the surrounding steel material to rust easily.
SUMMARY OF THE INVENTION In view of such circumstances, it is an object of the present invention to reduce the weight of the legs of a building chimney and to prevent water from accumulating inside the legs.

In order to solve the above problems, a building chimney according to the present invention includes a leg portion installed on a building frame floor, and a chimney main body rising from the leg portion,
The leg portion includes a peripheral wall and a chimney bottom pan made of a metal plate stretched over the inner side of the peripheral wall.
The leg portion of the building chimney according to the present invention is a leg portion of the building chimney that is installed on the floor of the building frame, and comprises a peripheral wall and a chimney bottom pan made of a metal plate stretched over the inner side of the peripheral wall. , is characterized by including
By providing a metal chimney bottom pan, castable refractory material can be omitted from the chimney foot, and the thickness of the metal chimney bottom pan can be reduced to reduce the weight of the foot.
Metal chimney bottom pans are less prone to cracks and other deterioration than castable refractories. Therefore, it is possible to prevent water from accumulating inside the leg. A metal material of the chimney bottom pan is preferably a corrosion-resistant metal such as stainless steel.
It is preferable that the inside of the legs is filled with a low-specific-gravity heat insulating material such as heat-resistant glass felt, and the top surface of the heat insulating material is covered with the chimney bottom pan.

Preferably, the legs are provided with support means for supporting the chimney bottom pan so as to allow thermal displacement in the in-plane direction.
The support means support the chimney pan and absorb thermal expansion of the chimney pan.

The leg portion is provided with a body receiver that protrudes inward from the peripheral wall and on which a lower end portion of the chimney body is placed,
An outer peripheral portion of the chimney bottom pan is attached to the lower surface of the main body receiver and connected by a bolt, and an insertion hole through which the bolt is inserted is formed in the outer peripheral portion, and the insertion hole is a loose hole. preferable.
Hereby a body receiver for the chimney body is provided as support means for the chimney bottom pan. The clearance between the inner peripheral edge of the loose hole and the bolt can accommodate the thermal expansion of the chimney bottom pan.

The support means has a pan receiver projecting inward from the peripheral wall, and the outer periphery of the chimney bottom pan is placed on the pan receiver, and the inner surface of the peripheral wall and the outer periphery of the chimney bottom pan are placed on the pan receiver. are preferably spaced apart to accommodate said thermal displacement.
The pan receiver can support the chimney bottom pan, displace the outer circumference of the chimney bottom pan on the pan receiver, and absorb thermal expansion of the chimney bottom pan.

Advantageous Effects of Invention According to the present invention, it is possible to reduce the weight of the leg of a building chimney and prevent water from penetrating into the leg and accumulating inside the leg.

FIG. 1 is a front cross-sectional view of a lower portion of a building chimney according to a first embodiment of the present invention. FIG. 2 is a front cross-sectional view showing an enlarged circular portion II of FIG. FIG. 3 is a perspective view of the leg of the building chimney. FIG. 4 is a cross-sectional view showing an enlarged circular portion IV in FIG. 5 is a plan cross-sectional view of the building chimney along line VV of FIG. 2; FIG. FIG. 6 is an enlarged front cross-sectional view of the lower portion of the building chimney according to the second embodiment of the present invention. FIG. 7 is a cross-sectional view showing an enlarged circular portion VII of FIG.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.
<First Embodiment (Figs. 1 to 5)>
As shown in FIG. 1, an atrium space 2 is provided in a frame 1a of a building 1. As shown in FIG. The atrium space 2 extends vertically through the building 1. - 特許庁A building chimney 10 is installed in the atrium space 2. - 特許庁The building chimney 10 includes a chimney body 11 and legs 20 . As shown in FIG. 2, the chimney main body 11 includes a heat insulating wall 13, an outer wall 14, and an inner wall 15, and has a rectangular tubular shape (FIG. 3) with its axis directed vertically (up and down). It has become. The heat insulating wall 13 is made of a hard heat insulating material such as calcium silicate. An outer wall 14 is provided on the outer surface of the heat insulating wall 13 . An inner wall 15 is provided on the inner surface of the heat insulating wall 13 . The outer wall 14 and the inner wall 15 are made of metal plates such as steel plates.
Although detailed illustration is omitted, the chimney main body 11 is divided into a plurality of chimney units. A chimney body 11 is configured by stacking these chimney units in a line vertically. Each chimney unit is supported by the building skeleton 1a around the atrium space 2 via support arms.

As shown in FIG. 1, an exhaust duct 3 from a facility (not shown) that discharges gas such as a boiler and a generator in the building 1 is connected to the side of the chimney body 11 near the lower end. An upper end (not shown) of the chimney 10 protrudes from the roof of the building 1 or the like.

The bottom structure of the building chimney 10 is configured as follows.
As shown in FIG. 1 , a chimney foundation 4 is provided at the bottom of the atrium space 2 of the building 1 . The chimney foundation 4 is made of a concrete slab that constitutes a part of the frame floor of the building 1 . A leg 20 is mounted on the chimney base 4 . A chimney body 11 is raised from the legs 20 .

As shown in FIGS. 2 and 3, the leg portion 20 includes a bottom plate 21 and a peripheral wall 22, and is formed in the shape of a square box or base plate when viewed from above. The bottom plate 21 is made of a square steel plate. An outer peripheral portion of the bottom plate 21 extends outward from four sides of the peripheral wall 22 to form a bottom flange 21f. A bottom flange 21 f is fixed to the chimney foundation 4 by anchor bolts 5 . Thereby, the legs 30 are fixed to the chimney base 4 (framework floor). The anchor bolts 5 are embedded anchors that are embedded in concrete when the foundation 4 is concreted.

As shown in FIG. 3, a peripheral wall 22 is provided on the bottom plate 21 . As shown in FIGS. 1 and 2 , the peripheral wall 22 is integrated with the outer wall 14 of the chimney body 11 . A lower portion of the steel plate forming the outer wall 14 serves as a peripheral wall 22 of the leg portion 20 . A peripheral wall 22 is abutted against and welded to the upper surface of the bottom plate 21 . A plurality of vertical outer longitudinal ribs 24 are provided at intervals along the outer periphery of the peripheral wall 22 at the outer corner formed by the outer surface of the peripheral wall 22 and the bottom flange 21f. As shown in FIGS. 2 and 5, a plurality of vertical inner vertical ribs 25 (only one is shown in the figure) are formed on the inner corner of the peripheral wall 22 at the inner corner formed by the inner surface of the peripheral wall 22 and the bottom plate 21 . They are spaced along the circumference. The upper ends of the inner longitudinal ribs 25 are arranged at an intermediate height of the peripheral wall 22 .

As shown in FIGS. 2 and 3, a body receiver 41 is provided on the inner surface (left side in FIG. 2) of the peripheral wall 22 so as to protrude inward (to the left in FIG. 2) of the leg portion 20. there is The body receiver 41 is formed in a rectangular frame shape from a thick steel plate. The outer peripheral edge of the main body receiver 41 is welded against the inner surface of the peripheral wall 22 . In addition, the body receiver 41 is supported from below by the inner vertical rib 25 (support rib) by abutting and welding the upper end of the inner vertical rib 25 against the lower surface of the body receiver 41 .

The heat insulating wall 13 of the chimney body 11 is placed on and supported by the body receiver 41. - 特許庁
Note that the peripheral wall 22 of the leg portion 20 and the outer wall 14 of the chimney main body 11 may be separate bodies. The lower end of the chimney body 11 may be inserted into a peripheral wall 22 that is separate from the outer wall 14 .

As shown in FIGS. 1 and 2, a portion of the internal space of the leg portion 20 below the main body receiver 41 is filled with a heat insulating material 23 having a low specific gravity. The specific gravity of the light specific gravity heat insulating material 23 is preferably 1 or less, which is sufficiently light compared to castable refractories containing sand as a main component. The material of the low-specific-gravity heat insulating material 23 is preferably heat-resistant glass felt, but is not limited to this, and heat-resistant foamed resin or the like may be used.

As shown in FIGS. 2 and 3, the chimney bottom pan 30 is placed on the upper surface of the light specific gravity heat insulating material 23 . The chimney bottom pan 30 includes a pan portion 31 excluding the outer peripheral portion and a held portion 32 consisting of the outer peripheral portion, and is formed in a square plate shape matching the cross-sectional shape of the leg portion 20 . As shown in FIG. 3, a drain port 35 is provided in the central portion of the pan portion 31 . The pan portion 31 is formed with a drainage gradient that descends toward the drainage port 35. - 特許庁
Note that the position of the drain port 35 is not limited to the central portion of the pan portion 31 and may be an end portion or a corner portion of the pan portion 31 .

As shown in FIG. 2 , a held portion 32 is provided on the outer circumference of the bread portion 31 . The held portion 32 does not have a drainage slope and is horizontal. A bent portion 36 is formed in a continuous portion between the held portion 32 and the bread portion 31 .

As shown in FIG. 3, a chimney bottom pan 30 consisting of a pan portion 31 and a held portion 32 is divided into four dividing plates 34 along diagonal dividing lines 33 connecting four corners and a drain port 35. there is A portion of each dividing plate 34 that constitutes the pan portion 31 is inclined downward toward the drain port 35 . Opposing edges of adjacent dividing plates 34 are butted and welded together. The weld bead is the parting line 33 .

The material of each dividing plate 34 and thus the chimney bottom pan 30 is preferably composed of a corrosion-resistant metal such as stainless steel. The chimney bottom pan 30 only needs to have a shape-retaining property that can maintain the drainage gradient, and does not need to bear the structural strength of the building chimney 10 . Therefore, the chimney bottom pan 30 may be thin. For example, the thickness of the chimney bottom pan 30 is about 1 mm to several mm, but may be less than 1 mm.

As shown in FIGS. 2 and 3, a chimney bottom pan 30 spans the inside of the peripheral wall 2 . The chimney bottom pan 30 is arranged inside the leg portion 20 at a height near the main body receiver 41 or at a height slightly lower than the main body receiver 41 . The pan part 31 covers the light specific gravity heat insulating material 23 exposed inside the body receiver 41 and closes the inner space of the body receiver 41 .

As shown in FIG. 2 , the held portion 32 is applied to the lower surface of the main body receiver 41 and connected to the main body receiver 41 by bolts 42 and nuts 43 . As shown in FIG. 3 , the bolts 42 are spaced apart from each other in the circumferential direction of the body receiver 41 .

A support means 40 is configured by the body receiver 41 , the bolt 42 and the nut 43 . The held portion 32 is supported by the peripheral wall 22 via the support means 40 . A body receiver 41 for receiving the chimney body 11 is provided as a support member for the chimney bottom pan 30 .

As shown in FIG. 2, the lower end surface of the heat insulation wall 13 of the chimney body 11 is formed with a relief recess 13d. The head of the bolt 42 is inserted into the escape recess 13d.
The head of the bolt 42 may be welded to the upper surface of the body receiver 41 .

As shown in FIG. 5, the outer end portion (the right end portion in FIG. 5) of the held portion 32 does not reach the peripheral wall 22, and extends from the inner longitudinal rib 25 toward the center of the leg portion (left side in FIG. 5). is seperated. As shown in FIGS. 4 and 5, an insertion hole 32d through which the bolt 42 is inserted in the held portion 32 is a loose hole having a diameter sufficiently larger than the outer diameter of the neck portion of the bolt 42. As shown in FIGS. A washer 44 between the chimney bottom pan 30 and the nut 43 has a larger diameter than the insertion hole 32d. This allows thermal displacement (thermal expansion and thermal contraction) in the in-plane direction of the chimney bottom pan 30 . In other words, the support means 40 supports the chimney bottom pan 30 so as to allow thermal displacement of the chimney bottom pan 30 in the in-plane direction.

In the chimney 10 for building, the upper surface of the leg 20 is constituted by the chimney bottom pan 30 with a drainage slope, so that the water on the leg 20 can flow down to the drain port 35 and be drained.
The chimney bottom pan 30 made of metal only needs to have the minimum shape-retaining strength to maintain the drain gradient, and can be made as thin as possible to reduce weight. The lower leg space of the chimney bottom pan 30 can be filled with light specific gravity insulation 23 in place of the heavy specific gravity castable refractory. This allows the leg 20 to be significantly lighter than a chimney leg having castable refractories. Therefore, it is possible to reduce the size of the lifting machine for carrying out the legs 20 from the chimney manufacturing factory and installing the legs 20 at the construction site of the building 1, thereby facilitating the work.
Furthermore, the steady load on the chimney base 4 (framework floor) that receives the static load of the legs 20 can be reduced. Therefore, in constructing the building 1, it is possible to avoid the necessity of increasing the number of reinforcing bars and increasing the thickness of the concrete slab that constitutes the chimney foundation 4.

The chimney bottom pan 30 is less likely to deteriorate over time than castable refractory materials, and is less susceptible to deterioration and damage such as cracks. Therefore, it is possible to reduce the possibility that water will seep into and accumulate inside the leg 20 from such a deteriorated damaged portion, and the possibility that the steel materials such as the peripheral wall 22 and the bottom plate 21 of the leg 20 will rust can be reduced.
Since the chimney bottom pan 30 made of metal has a relatively large coefficient of linear expansion, it is greatly thermally expanded by the heat of the exhaust gas. On the other hand, since the insertion hole 32d is a loose hole having a diameter sufficiently larger than that of the bolt 42, the thermal expansion displacement of the chimney bottom pan 30 can be absorbed. In addition, since a sufficient distance is set between the outer end of the held portion 32 and the inner vertical rib 25, even if the chimney bottom pan 30 thermally expands, the held portion 32 will remain in contact with the inner vertical rib 25. The thermal expansion is not constrained by bumping into. Of course, the held portion 32 does not hit against the peripheral wall 22 and the thermal expansion is not restrained.

Next, another embodiment of the present invention will be described. In the following embodiments, the same reference numerals are given to the drawings to duplicate the configurations already described, and the description thereof will be omitted.
<Second Embodiment (Figs. 6 and 7)>
As shown in FIG. 6, in a building chimney 10B according to the second embodiment of the present invention, a flange 26 is provided at the upper end of the leg 20. As shown in FIG. The flange 26 protrudes outward (to the right in FIG. 6) from the upper end of the peripheral wall 22 . A support rib 27 is provided on the upper portion of the outer surface of the peripheral wall 22, and the flange 26 is supported by the support rib 27 from below. The upper surface of the flange 26 is flush with the upper end surface of the peripheral wall 22 .

A flange 16 is provided at the lower end of the chimney body 11 so as to protrude outward (to the right in FIG. 6). A reinforcing rib 17 is provided on the upper surface of the flange 16 . The lower surface of the flange 16 is flush with the lower surface of the bottom plate 18 that receives the heat insulating wall 13 at the lower end of the chimney body 11 . The outer peripheral portion (right side in FIG. 6) of the bottom plate 18 may extend beyond the outer wall 14 to form the flange 16 .

A chimney body 11 is placed on the legs 20 . The lower surfaces of the bottom plate 18 and the flange 16 abut against the upper end surface of the peripheral wall 22 and the upper surface of the flange 26 . Flanges 16 and 26 are connected by bolts 28 .

As shown in FIG. 6, the chimney bottom pan 50 of the leg portion 20 of the building chimney 10B is provided between a pan portion 51 having a drainage slope and a horizontal supported portion 53 (peripheral portion). A portion 52 is provided. The weir portion 52 surrounds the bread portion 51 and forms a step rising vertically from the bread portion 51 . A supported portion 53 horizontally protrudes outward (to the right in FIG. 6) from the upper end portion of the weir portion 52 .

As shown in FIG. 6, on the inner surface of the peripheral wall 22 of the leg portion 20 of the building chimney 10B, instead of the main body receiver 41 (FIG. 2), a pan receiver 61 (supporting means for the chimney bottom pan) is provided. . The pan receiver 61 protrudes inward from the peripheral wall 22 . Although not shown in detail, the bread receiver 61 is formed in a frame plate shape along the inner periphery of the peripheral wall 22 . An outer peripheral portion of the pan receiver 61 is welded to the peripheral wall 22 .

As shown in FIG. 6 , the held portion 53 of the chimney bottom pan 50 is placed on the pan receiver 61 . The chimney bottom pan 50 is thereby supported by the pan receiver 61 . As shown in FIG. 7 , a packing 62 is interposed between the held portion 53 and the pan receiver 61 . The bottom plate 18 of the chimney body 11 covers the held portion 53 . A packing 63 is interposed between the bottom plate 18 and the held portion 53 .

As shown in FIG. 7 , the outer end 53 e of the held portion 53 does not reach the inner surface of the peripheral wall 22 and is separated from the inner surface of the peripheral wall 22 . As a result, the held portion 53 can be displaced inward and outward (left and right in FIG. 7) along the upper surface of the pan receiver 61, and thermal expansion of the chimney bottom pan 50 is allowed.

According to the chimney bottom pan 50 of the second embodiment, not only is the drain slope formed in the pan portion 51, but also a stepped weir portion is provided between the pan portion 51 and the held portion 53 (peripheral portion). Since 52 is formed, water on the pan portion 51 can be prevented from flowing into the held portion 53 . Additionally, packings 62 and 63 prevent water from circulating around the outer ends of chimney bottom pan 50 . As a result, it is possible to reliably prevent water from permeating into the low-specific-gravity heat insulating material 23, and to suppress rusting of steel materials such as the peripheral wall portion 22 of the leg portion 20 and the bottom plate 21.例文帳に追加

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the scope of the invention.
For example, the cross-sectional shape of the building chimney and thus the legs is not limited to a quadrangle, but may be a circle or a polygon other than a quadrangle.

The invention is applicable to chimneys attached to buildings such as commercial buildings, factories and the like.

1 Building 1a Frame 2 Atrium space 3 Exhaust duct 4 Chimney base (frame floor)
10, 10B Building Chimney 11 Chimney Main Body 13 Heat Insulating Wall 13d Escape Recess 14 Outer Wall 15 Inner Wall 16 Flange 17 Reinforcing Rib 18 Bottom Plate 20 Leg 21 Bottom Plate 22 Surrounding Wall 23 Light Specific Gravity Heat Insulating Material 24 Outer Vertical Rib 25 Inner Vertical Rib 26 Flange 27 Support Rib 28 Bolt 30 Chimney bottom pan 31 Pan portion 32 Retained portion (peripheral portion)
32d Insertion hole 33 Parting line 34 Parting plate 35 Drain port 36 Bent part (continuous part)
40 support means 41 main body receiver 42 bolt 43 nut 44 washer 50 chimney bottom pan 51 pan portion 53 supported portion (peripheral portion)
52 weir part 61 pan receiver (support means for chimney bottom pan)
62, 63 packing

Claims (5)

comprising legs to be installed on the building frame floor and a chimney body rising from the legs,
A chimney for a building, wherein the leg includes a peripheral wall and a chimney bottom pan made of a metal plate stretched over the inner side of the peripheral wall. 2. The building chimney according to claim 1, wherein the legs are provided with supporting means for supporting the chimney bottom pan so as to allow thermal displacement in the in-plane direction. The leg portion is provided with a body receiver that protrudes inward from the peripheral wall and on which a lower end portion of the chimney body is placed,
An outer peripheral portion of the chimney bottom pan is attached to the lower surface of the main body receiver and connected by bolts, an insertion hole through which the bolt is inserted is formed in the outer peripheral portion, and the insertion hole is a loose hole. 3. A building chimney according to claim 1 or 2. The support means has a pan receiver projecting inward from the peripheral wall, and the outer periphery of the chimney bottom pan is placed on the pan receiver, and the inner surface of the peripheral wall and the outer periphery of the chimney bottom pan are placed on the pan receiver. are spaced apart to accommodate said thermal displacement. A leg of a building chimney that is installed on the building frame floor,
a peripheral wall;
a chimney bottom pan made of a metal plate stretched over the inside of the peripheral wall;
A building chimney leg comprising:

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