JP2017015277A - chimney - Google Patents

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JP2017015277A
JP2017015277A JP2015129811A JP2015129811A JP2017015277A JP 2017015277 A JP2017015277 A JP 2017015277A JP 2015129811 A JP2015129811 A JP 2015129811A JP 2015129811 A JP2015129811 A JP 2015129811A JP 2017015277 A JP2017015277 A JP 2017015277A
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chimney
spiral
inner cylinder
hook
double
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JP6031561B1 (en
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公博 小林
Kimihiro Kobayashi
公博 小林
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KOOKI KK
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Abstract

PROBLEM TO BE SOLVED: To provide a chimney having a double cylinder structure capable of preventing damage of a spiral inner cylinder, collapse of heat insulation material accompanied by collapse of the double cylinder structure and subsequently loss of function of the chimney having double cylinder structure to enable life prolongation to be accomplished by supporting a load applied for performing a seaming work with reinforcement material.SOLUTION: A chimney 1 having a double cylinder structure is configured in such a way that several chimney units 1A to 1C having a double cylinder structure with heat insulation materials 4 filled between a spiral inner cylinder 2 including helical seamings 8 and an outer cylinder 3 enclosing the inner cylinder 2 are oppositely faced up and down through packings 6 and a pair of opposing chimney units faced to each other in just upper one and lower one are connected by connecting means 5. The spiral inner cylinder 2 is provided with reinforcing members 9 for preventing damage of the spiral inner cylinder 2 accompanied by separation of the seamings 8 or damage at the locations other than the seamings 8 by bearing load applied to the helical seamings 8.SELECTED DRAWING: Figure 1

Description

本発明は、内筒と、この内筒を取り囲む外筒との間に断熱材を装填した二重筒構造の煙突に係り、例えば、非常用発電機を駆動するガスタービンエンジンやディーゼルエンジンの排ガス、ボイラー排ガスあるいは産業廃棄物焼却炉の排ガスなどを高所に導いて放散させる大径かつ長寸の大型煙突として好適な二重筒構造の煙突に関するものである。   The present invention relates to a chimney having a double cylinder structure in which a heat insulating material is loaded between an inner cylinder and an outer cylinder surrounding the inner cylinder, for example, exhaust gas from a gas turbine engine or a diesel engine that drives an emergency generator. The present invention relates to a chimney having a double tube structure suitable as a large-diameter and long-sized large chimney for guiding and radiating boiler exhaust gas or industrial waste incinerator exhaust gas to a high place.

従来、内筒と、この内筒を取り囲む外筒との間に断熱材を装填した二重筒構造の煙突として、特許文献１に記載のものが提供されている。この二重筒構造の煙突を図５，図６に示す。   Conventionally, as a chimney having a double cylinder structure in which a heat insulating material is loaded between an inner cylinder and an outer cylinder surrounding the inner cylinder, the one described in Patent Document 1 is provided. The chimney of this double cylinder structure is shown in FIGS.

図５，図６に示す二重筒構造の煙突１は、ステンレス鋼板からなる横断面円形の内筒２と、亜鉛メッキ鋼板からなる横断面円形の外筒３との間の環状空間に断熱材４を装填した二重筒構造の煙突ユニットの複数１Ａ，１Ｂ，１Ｃを上下に配置するとともに、直上と直下で互いに対向する一対の煙突ユニット１Ａと１Ｂおよび１Ｂと１Ｃを嵌め合い構造を主とする接続手段５により互いに接続することにより構築されている。   The chimney 1 having a double-cylinder structure shown in FIGS. 5 and 6 includes a heat insulating material in an annular space between an inner cylinder 2 having a circular cross section made of a stainless steel plate and an outer cylinder 3 having a circular cross section made of a galvanized steel plate. A plurality of chimney units 1A, 1B, 1C of a double cylinder structure loaded with 4 are arranged vertically and a pair of chimney units 1A and 1B and 1B and 1C facing each other directly above and below are mainly fitted. It is constructed by connecting to each other by connecting means 5 to be connected.

前記二重筒構造の煙突１では、その運転時、内筒２は高温（６５０℃）の排ガスに晒され、高熱が継続的に負荷されるので破れにより損傷する。この損傷が経時により拡大すると、内筒２は主として座屈により損壊して二重筒構造が崩壊し、断熱材４が煙道７に落下する断熱破壊を招いて煙突１の機能が喪失する。このような経緯による二重筒構造の煙突１の機能喪失をできる限り遅らせる目的で、内筒２は耐熱強度の高いステンレス鋼板によって製作している。しかし、高熱の継続的負荷による内筒２の損傷を阻止することはできない。   In the double-stacked chimney 1, during operation, the inner cylinder 2 is exposed to high-temperature (650 ° C.) exhaust gas and is continuously loaded with high heat, and is damaged due to tearing. When this damage expands with time, the inner cylinder 2 is damaged mainly by buckling, the double cylinder structure is collapsed, and the function of the chimney 1 is lost due to the adiabatic breakdown of the heat insulating material 4 falling into the flue 7. For the purpose of delaying as much as possible the loss of function of the chimney 1 having the double cylinder structure due to such circumstances, the inner cylinder 2 is made of a stainless steel plate having high heat resistance. However, it is not possible to prevent damage to the inner cylinder 2 due to a continuous load of high heat.

一方、この種の二重筒構造の煙突１では、その口径（内筒２の内径）が大きく（２００ｍｍ〜１５００ｍｍ）設定される。ところが、内筒２は薄肉であるため引き抜き手法などによりシームレス（継目無し）に製作することはできない。このため、シームウエルド（継目溶接）した直筒型の内筒２が使用される。しかし、この種の内筒２は、その製作に手間がかかってコスト高を招くばかりか強度が弱い。しかも、二重筒構造の煙突１は、その高さが１０ｍにも達するので、各煙突ユニット１Ａ，１Ｂ，１Ｃおよびこれらの内筒２の高さが高くなり、内筒２の座屈荷重は小さくなる。また、高熱負荷の継続により損傷すると、座屈荷重がさらに小さくなって、損傷度が比較的小さくても（破れが比較的小さくても）、座屈により内筒２が損壊して二重筒構造が崩壊し、断熱材４の煙道７落下に伴う断熱破壊を招いて、二重筒構造の煙突１の機能は喪失する。特に、軸方向に最大圧縮荷重が負荷される最下位の煙突ユニット１Ｃでは、座屈による内筒２の損壊が最も懸念され、これが二重筒構造の煙突１の機能喪失を早めて短命にしている。   On the other hand, in the chimney 1 having this type of double cylinder structure, the diameter (inner diameter of the inner cylinder 2) is set large (200 mm to 1500 mm). However, since the inner cylinder 2 is thin, it cannot be manufactured seamlessly (with no seams) by a drawing method or the like. For this reason, a straight cylinder type inner cylinder 2 subjected to seam welding (seam welding) is used. However, the inner cylinder 2 of this type is troublesome in its production, resulting in high costs and low strength. Moreover, since the chimney 1 having a double cylinder structure reaches a height of 10 m, the height of each chimney unit 1A, 1B, 1C and these inner cylinders 2 is increased, and the buckling load of the inner cylinder 2 is Get smaller. Further, if the damage is caused by the continuous high heat load, the buckling load is further reduced, and even if the degree of damage is relatively small (even if the tear is relatively small), the inner cylinder 2 is damaged by the buckling and the double cylinder The structure collapses, causing a heat insulation breakage due to the fall of the flue 7 of the heat insulating material 4, and the function of the chimney 1 having the double cylinder structure is lost. In particular, in the lowest chimney unit 1C in which the maximum compressive load is applied in the axial direction, the inner cylinder 2 is most likely to be damaged due to buckling, and this shortens the function loss of the chimney 1 having the double cylinder structure and shortens the life. Yes.

他方、高温の排ガスに晒される内筒２は温度変化によって伸縮（熱膨張・熱収縮）する。高さが１０ｍの二重筒構造の煙突１において、内筒２が６５０℃の排ガスに晒された高温時と運休時（常温時）の軸方向の伸縮幅は、１１４．４ｍｍであることが確認されている。このような伸縮を吸収するため、直筒型の内筒２では、例えば滑式の伸縮吸収機構（図示省略）を組み込む必要があり、その分、部品点数が増加して構造が複雑になり、製作工数が増すとともにコスト高を招くことになる。   On the other hand, the inner cylinder 2 exposed to high-temperature exhaust gas expands and contracts (thermal expansion and thermal contraction) due to a temperature change. In the chimney 1 having a double cylinder structure having a height of 10 m, the expansion / contraction width in the axial direction when the inner cylinder 2 is exposed to exhaust gas at 650 ° C. and when it is suspended (at room temperature) is 114.4 mm. It has been confirmed. In order to absorb such expansion and contraction, it is necessary to incorporate, for example, a sliding expansion / contraction absorption mechanism (not shown) in the straight cylinder type inner cylinder 2, which increases the number of parts and makes the structure complicated and manufactured. As the number of steps increases, the cost increases.

そこで、前記特許文献１に記載の内筒２の欠点を改善した内筒を備える二重筒構造の煙突１が提供されている。この二重筒構造の煙突１を図７，図８に示す。これらの図において、二重筒構造の煙突１は、ステンレス鋼板からなる横断面円形の内筒２と、亜鉛メッキ鋼板からなる横断面円形の外筒３との間の環状空間に断熱材４を装填した二重筒構造の煙突ユニットの複数１Ａ，１Ｂ，１Ｃを上下に配置するとともに、直上と直下で互いに対向する一対の煙突ユニット１Ａと１Ｂおよび１Ｂと１Ｃを、パッキン６を介在させて接続手段５により接続することによって構築される。   Therefore, a double-stacked chimney 1 having an inner cylinder in which the disadvantages of the inner cylinder 2 described in Patent Document 1 are improved is provided. The chimney 1 having the double cylinder structure is shown in FIGS. In these figures, a chimney 1 having a double cylinder structure has a heat insulating material 4 in an annular space between an inner cylinder 2 having a circular cross section made of a stainless steel plate and an outer cylinder 3 having a circular cross section made of a galvanized steel plate. A plurality of stacked double-stacked chimney units 1A, 1B, and 1C are arranged vertically, and a pair of chimney units 1A and 1B and 1B and 1C facing each other immediately above and directly below are connected via a packing 6. It is constructed by connecting by means 5.

各煙突ユニット１Ａ，１Ｂ，１Ｃにおける内筒２は、図８，図９に示すように、螺旋状のハゼ掛け８を備えるスパイラル内筒２からなる。螺旋状のハゼ掛け８は、例えば、板取りにより図１０（ａ）に示すステンレス鋼板からなる斜め帯状の原板８０を用意し、この原板８０の幅方向一端部（左端部）８１に長手方向の全長に亙って図１０（ｂ）に示す一方のフック状折り曲げ部８１ａを形成するとともに、図１０（ａ）の原板８０の幅方向他端部（右端部）８２に長手方向の全長に亙って図１０（ｃ）に示す他方のフック状折り曲げ部８２ａを形成する。つぎに、原板８０を円筒状の芯型（図示省略）外周にあてがって適宜螺旋状に巻回する工程の進行に同期して、前記一方のフック状折り曲げ部８１ａと他方のフック状折り曲げ部８２ａとを、図１１に示すように、上下に指向して互いに掛け合わせる工程を進行させる手法によって、上下に指向する、所謂、縦甲ハゼからなる螺旋状のハゼ掛け８を備えるスパイラル内筒２を製作できる。   The inner cylinder 2 in each chimney unit 1A, 1B, 1C consists of the spiral inner cylinder 2 provided with the spiral goby hook 8, as shown in FIGS. The spiral goblet 8 is prepared by, for example, preparing a slanted strip-shaped base plate 80 made of a stainless steel plate shown in FIG. 10 (a) by plate cutting, and extending in the longitudinal direction at one end portion (left end portion) 81 of the original plate 80 in the longitudinal direction. A hook-shaped bent portion 81a shown in FIG. 10B is formed over the entire length, and the other end portion (right end portion) in the width direction of the original plate 80 in FIG. Thus, the other hook-shaped bent portion 82a shown in FIG. 10 (c) is formed. Next, the one hook-shaped bent portion 81a and the other hook-shaped bent portion 82a are synchronized with the progress of the process of winding the original plate 80 on the outer periphery of a cylindrical core (not shown) as appropriate. As shown in FIG. 11, the spiral inner cylinder 2 having a spiral goby hook 8 made of a so-called vertical goby, which is directed vertically, by a method of proceeding a process of multiplying them vertically and multiplying each other, as shown in FIG. Can be produced.

螺旋状のハゼ掛け８を備えるスパイラル内筒２は、特許文献１に記載のシームウエルド（継目溶接）した直筒型の内筒２よりも製作が容易なためコストダウンを図れる。また、剛性の高いハゼ掛け８が螺旋状に備わっていることにより強度が高くなって、軸方向と径方向の圧縮応力がそれぞれ大きくなり、軸方向の圧縮応力が大きくなることで座屈荷重が増大し、座屈による損壊を抑えることができる。したがって、高熱負荷の継続により螺旋状のハゼ掛け８以外の部位８３［図１０（ａ）において、原板８０の幅Ｗ方向一端部８１と幅Ｗ方向他端部８２の間の平坦な部位］が破れて損傷しても、損傷度が相当大きくなって座屈荷重が相当小さくなるまで座屈しない。このため、軸方向に最大圧縮荷重が負荷される最下位の煙突ユニット１Ｃにおける内筒２の座屈による損壊を有効に抑え、二重筒構造の煙突１の機能喪失を遅延することで延命を達成できる。   The spiral inner cylinder 2 having the spiral gob hook 8 is easier to manufacture than the seam-welded (cylindrical) inner cylinder 2 described in Patent Document 1, so that the cost can be reduced. Further, the strength of the goby hook 8 having high rigidity is increased, and the compressive stress in the axial direction and the radial direction is increased, and the compressive stress in the axial direction is increased, so that the buckling load is increased. It increases and can suppress the damage by buckling. Accordingly, the portion 83 other than the spiral gob hook 8 due to continuation of the high heat load [in FIG. 10A, the flat portion between the width W direction one end portion 81 and the width W direction other end portion 82 of the original plate 80]. Even if it is torn and damaged, it will not buckle until the degree of damage is significantly increased and the buckling load is significantly reduced. For this reason, it is possible to effectively suppress the damage caused by buckling of the inner cylinder 2 in the lowest chimney unit 1C in which the maximum compressive load is applied in the axial direction, and to prolong the life by delaying the loss of function of the chimney 1 having the double cylinder structure. Can be achieved.

また、スパイラル内筒２の熱膨張・熱収縮は、ハゼ掛け８の螺旋方向の伸縮に変換して吸収できるので、特許文献１に記載の内筒２において必要とされる伸縮吸収機構（例えば滑式の伸縮吸収機構）の組み込みが不要になり、部品点数の削減、構造の簡略化および製作工数の低減が達成されて、コストダウンが可能となる。   In addition, since the thermal expansion / contraction of the spiral inner cylinder 2 can be absorbed by being converted into expansion / contraction in the spiral direction of the gob hook 8, the expansion / contraction absorption mechanism (for example, sliding) required in the inner cylinder 2 described in Patent Document 1 can be absorbed. Incorporation of an expansion / contraction absorption mechanism) is not required, reducing the number of parts, simplifying the structure, and reducing the number of manufacturing steps, thereby reducing the cost.

ところが、螺旋状のハゼ掛け８を備えるスパイラル内筒２では、スパイラル内筒２の自重や熱膨張・熱収縮に伴う螺旋方向の伸縮などの負荷が螺旋状のハゼ掛け８にかかるので、一方の折り曲げ部８１ａと他方の折り曲げ部８２ａとの掛け合せが外れて分離し、開きが発生するおそれを有する。開きが発生しても、この開きが極小で局部的なものであれば、二重筒構造の煙突１の機能は保持されて、運行に支障をきたす事態は起こらないので無視することができる。しかし、経時により分離度が大きくなって開きが拡大すると、内筒２が損壊して二重筒構造が崩壊し、断熱材４が煙道７に落下する断熱破壊を招いて二重筒構造の煙突１の機能を喪失させる。   However, in the spiral inner cylinder 2 provided with the spiral goby hook 8, since the load such as the expansion and contraction in the spiral direction due to the self-weight of the spiral inner cylinder 2 and thermal expansion and contraction is applied to the spiral gouge hook 8, There is a possibility that the folded portion 81a and the other folded portion 82a are separated from each other and separated to cause an opening. Even if the opening occurs, if the opening is minimal and local, the function of the chimney 1 having the double cylinder structure is maintained, and the situation that does not hinder the operation does not occur and can be ignored. However, when the degree of separation increases with time and the opening expands, the inner cylinder 2 is damaged, the double cylinder structure is collapsed, and the heat insulating material 4 falls into the flue 7, causing adiabatic destruction and the double cylinder structure. The function of the chimney 1 is lost.

また、高熱負荷の継続により螺旋状のハゼ掛け８以外の部位８３が破れて損傷し、この破れが経時による損傷度が拡大すると、最終的に螺旋状のハゼ掛け８のみが残存して崩落するスパイラル内筒２の損壊が起こり、二重筒構造が崩壊し、断熱材４が煙道７に落下する断熱破壊を招いて二重筒構造の煙突１の機能を喪失させる。   Further, when the high heat load is continued, the portion 83 other than the spiral goby hook 8 is broken and damaged, and when the damage increases with time, only the spiral gouge hook 8 finally remains and collapses. The spiral inner cylinder 2 is damaged, the double cylinder structure is collapsed, and the heat insulating material 4 is dropped into the flue 7 to cause the adiabatic breakdown, and the function of the chimney 1 having the double cylinder structure is lost.

特開２００４−７７０４６号公報JP 2004-77046 A

本発明は、上記の実情に鑑みてなされたもので、剛性の高いハゼ掛けが螺旋状に備わっていることにより座屈荷重が増大したスパイラル内筒を備える二重構造の煙突でありながら、前記ハゼ掛けを含む内筒にかかる負荷を補強材で負担することにより当該内筒の損壊を防止し、二重筒構造の崩壊に伴う断熱材破壊、延いては二重筒構造の煙突の機能喪失を防止して延命を達成することができる二重構造の煙突の提供を目的とするものである。   The present invention has been made in view of the above circumstances, and is a double-structured chimney including a spiral inner cylinder having a buckling load increased by providing a highly rigid goby hook spirally. By bearing the load on the inner cylinder, including the haze, with the reinforcing material, the inner cylinder is prevented from being damaged, the insulation material is destroyed due to the collapse of the double cylinder structure, and the chimney of the double cylinder structure is lost. The purpose of this invention is to provide a chimney having a double structure capable of preventing the above-mentioned problems and achieving a long life.

前記目的を達成するために、本発明に係る二重構造の煙突は、螺旋状のハゼ掛けを備えるスパイラル内筒と、この内筒を取り囲む外筒との間に断熱材を装填した二重筒構造の煙突において、
前記スパイラル内筒には、前記螺旋状のハゼ掛けにかかる負荷を負担して、ハゼ掛けの分離やハゼ掛け以外の部位の損傷に伴う当該スパイラル内筒の損壊を防止する補強材が備わっていることを特徴とするものである。 In order to achieve the above object, a double-stacked chimney according to the present invention has a double cylinder in which a heat insulating material is loaded between a spiral inner cylinder having a spiral goblet and an outer cylinder surrounding the inner cylinder. In the chimney of the structure,
The spiral inner cylinder is provided with a reinforcing material that bears a load applied to the spiral goblet and prevents the spiral inner pipe from being damaged due to separation of the goblet and damage to parts other than the goblet. It is characterized by this.

前記構成の二重筒構造の煙突によると、スパイラル内筒の自重や熱膨張・熱収縮に伴う螺旋方向の伸縮などの螺旋状のハゼ掛けにかかる負荷は補強材が負担する。このため、ハゼ掛けの分離による開きの発生が防止され、スパイラル内筒の損壊を防止できる。また、螺旋状のハゼ掛け以外の部位の損傷拡大で最終的にハゼ掛けのみが残存しても、残存した螺旋状のハゼ掛けは補強材が支持する。換言するなら、残存した螺旋状のハゼ掛けの自重を補強材が負担してハゼ掛けの崩落を防止する。これにより、二重筒構造の崩壊に伴う断熱材破壊、延いては二重筒構造の煙突の機能喪失を防止して、煙突の延命を達成することができる。   According to the chimney having the above-described double-tube structure, the reinforcing material bears the load applied to the spiral goblet such as the self-weight of the spiral inner tube and the expansion and contraction in the spiral direction accompanying thermal expansion and contraction. For this reason, the generation | occurrence | production of the opening by separation of a goblet is prevented, and damage to a spiral inner cylinder can be prevented. In addition, even if only the goby hook is finally left due to the damage expansion of the portion other than the helical goby hook, the remaining helical gouge hook is supported by the reinforcing material. In other words, the reinforcing material bears the weight of the remaining spiral goby hook to prevent the fall of the goby hook. Thereby, it is possible to prevent the heat insulation material destruction due to the collapse of the double cylinder structure, and thus the loss of function of the chimney of the double cylinder structure, and to achieve the life extension of the chimney.

前記補強材は、上下方向に延在してスパイラル内筒に備わる少なくとも二つからなる。これによると、必要最小数量の二つの補強材によって、螺旋状のハゼ掛けにかかる負荷を有効に負担し、ハゼ掛けの分離による開きの発生および当該ハゼ掛けの崩落を確実に防止することができるので、補強材の使用数量を削減してコストダウンを図れるばかりか、構造の簡素化および製作の容易化に寄与することが可能となる。   The reinforcing material includes at least two extending in the vertical direction and provided in the spiral inner cylinder. According to this, it is possible to effectively bear the load applied to the spiral goby hook by the required minimum quantity of the two reinforcing materials, and to reliably prevent the occurrence of the opening due to the separation of the gouge hook and the collapse of the goby hook. Therefore, not only can the amount of the reinforcing material used be reduced to reduce the cost, but also the structure can be simplified and the manufacturing can be facilitated.

前記螺旋状のハゼ掛けに前記補強材が備わっている。これによれば、補強材により螺旋状のハゼ掛けにかかる負荷を直接負担できるので、ハゼ掛けの分離による開きの発生および当該ハゼ掛けの崩落をより一層確実に防止することが可能となる。   The spiral goby hook is provided with the reinforcing material. According to this, since the load applied to the spiral goby hook can be directly borne by the reinforcing material, it is possible to more reliably prevent the occurrence of opening due to the separation of the gouge hook and the collapse of the gouge hook.

前記補強材を含む前記スパイラル内筒は、遮蔽シートによって取り巻かれている。これによると、たとえ螺旋状のハゼ掛けが開いたり、螺旋状のハゼ掛け以外の部位の損傷で当該部位が破れても、遮蔽シートによって断熱材の煙道への落下を確実に防止して断熱破壊を避け、二重筒構造の煙突の延命に寄与することができる。   The spiral inner cylinder including the reinforcing material is surrounded by a shielding sheet. According to this, even if the spiral goblet is opened or the part is torn due to damage to parts other than the spiral goblet, the insulation sheet reliably prevents the insulation from falling into the flue. It can avoid the destruction and contribute to the life extension of the chimney with the double cylinder structure.

本発明に係る二重構造の煙突によれば、補強材によってハゼ掛けを含む内筒にかかる負荷が負担されるので、ハゼ掛けの分離による開きの発生および当該ハゼ掛けの崩落が防止される。これにより、二重筒構造の崩壊に伴う断熱材破壊、延いては二重筒構造の煙突の機能喪失を防止して、煙突の延命を達成することができる。   According to the double-structured chimney according to the present invention, the load applied to the inner cylinder including the goby hook is borne by the reinforcing material, so that the opening due to the separation of the gouge hook and the collapse of the gouge hook are prevented. Thereby, it is possible to prevent the heat insulation material destruction due to the collapse of the double cylinder structure, and thus the loss of function of the chimney of the double cylinder structure, and to achieve the life extension of the chimney.

本発明に係る二重筒構造の煙突の一実施形態を一部省略し、内筒２、ハゼ掛け８、補強剤９以外を半截断面で示す正面図である。It is a front view which omits some one embodiment of the chimney of the double cylinder structure which concerns on this invention, and shows a semi-cylindrical cross section other than the inner cylinder 2, the goby hook 8, and the reinforcing agent 9. FIG. 図１のＡ−Ａ線に沿う拡大横断平面図である。FIG. 2 is an enlarged transverse plan view taken along line AA in FIG. 1. スパイラル内筒の一実施形態を拡大して示す正面図である(遮蔽シート１２のみ断面で示す)。It is a front view which expands and shows one Embodiment of a spiral inner cylinder (only the shielding sheet 12 is shown in a cross section). 図４（ａ）は補強材の一例を部分的に示す斜視図であり、図４（ｂ）は補強材の他の例を部分的に示す斜視図である。FIG. 4A is a perspective view partially showing an example of the reinforcing material, and FIG. 4B is a perspective view partially showing another example of the reinforcing material. 第１従来例における煙突ユニットの正面図である。It is a front view of the chimney unit in the 1st conventional example. 第１従来例における煙突ユニットの接続状態を示す一部を省略した断面図である。It is sectional drawing which abbreviate | omitted one part which shows the connection state of the chimney unit in a 1st prior art example. 第２従来例に係る二重筒構造の煙突を一部省略して半截断面で示した正面図である。It is the front view which abbreviate | omitted a part of the chimney of the double cylinder structure which concerns on a 2nd prior art example, and showed with the semi-cylindrical cross section. 図７のＢ−Ｂ線に沿う拡大横断平面図である。FIG. 8 is an enlarged cross-sectional plan view taken along line BB in FIG. 7. 第２従来例に適用される螺旋状のハゼ掛けを備えるスパイラル内筒の正面図である。It is a front view of a spiral inner cylinder provided with the spiral goby hook applied to the 2nd conventional example. 図１０（ａ）は原板の正面図を示し、図１０（ｂ）は一方のフック状折り曲げ部の説明図であり、図１０（ｃ）は他方のフック状折り曲げ部の説明図である。FIG. 10A is a front view of the original plate, FIG. 10B is an explanatory view of one hook-shaped bent portion, and FIG. 10C is an explanatory view of the other hook-shaped bent portion. 螺旋状のハゼ掛けを拡大して示す断面説明図である。It is sectional explanatory drawing which expands and shows a spiral goby hook.

以下、本発明に係る二重筒構造の煙突の好ましい実施形態を図面に基づいて説明する。図１は本発明に係る二重筒構造の煙突の一実施形態を一部省略し、内筒２、ハゼ掛け８、補強剤９以外を半截断面で示す正面図、図２は図１のＡ−Ａ線に沿う横断平面、図３はスパイラル内筒の一実施形態を拡大して示す正面図である(遮蔽シート１２のみ断面で示す)。なお、前記第１および第２従来例と同一もしくは相当部分には同一符号を付して説明する。   Hereinafter, a preferred embodiment of a chimney having a double cylinder structure according to the present invention will be described with reference to the drawings. FIG. 1 is a front view of a chimney having a double-cylinder structure according to the present invention, in which a part of the chimney according to the present invention is omitted, except for the inner cylinder 2, the goose hook 8 and the reinforcing agent 9. FIG. 3 is an enlarged front view showing an embodiment of the spiral inner cylinder (only the shielding sheet 12 is shown in cross section). The same or corresponding parts as those in the first and second conventional examples will be described with the same reference numerals.

図１〜図３において、二重筒構造の煙突１は、ステンレス鋼板からなる横断面円形の内筒２と、亜鉛メッキ鋼板からなる横断面円形の外筒３との間の環状空間に、ロックウール，セラミックウール，ガラスウールなどの繊維質素材からなる断熱材４を装填した二重筒構造の煙突ユニットの複数１Ａ，１Ｂ，１Ｃを、突き合わせ構造により上下に配置するとともに、直上と直下で互いに対向する一対の煙突ユニット１Ａと１Ｂおよび１Ｂと１Ｃを、パッキン６を介在させて接続手段５により接続することによって構築される。前記パッキン６は、環状を呈するガラス繊維のマット状成形体からなる耐熱パッキンによって構成されている。   1 to 3, a chimney 1 having a double cylinder structure is locked in an annular space between an inner cylinder 2 having a circular cross section made of a stainless steel plate and an outer cylinder 3 having a circular cross section made of a galvanized steel plate. A plurality of chimney units 1A, 1B, and 1C having a double cylinder structure loaded with a heat insulating material 4 made of a fibrous material such as wool, ceramic wool, and glass wool are vertically arranged by a butting structure, and are directly above and below each other. It is constructed by connecting a pair of opposed chimney units 1A and 1B and 1B and 1C by a connecting means 5 with a packing 6 interposed therebetween. The packing 6 is constituted by a heat-resistant packing made of a glass fiber mat-like molded body having an annular shape.

各煙突ユニット１Ａ，１Ｂ，１Ｃにおける内筒２は、図９に示す従来の内筒２と同様に、図１１に示す縦甲ハゼからなる螺旋状のハゼ掛け８を備えており、図１〜図３に示すように、その外周には、上下方向に延在するステンレス鋼製の二つの補強材９を備えている。   The inner cylinder 2 in each of the chimney units 1A, 1B, 1C is provided with a spiral goby hook 8 made of a vertical goby shown in FIG. 11, like the conventional inner cylinder 2 shown in FIG. As shown in FIG. 3, the outer periphery is provided with two reinforcing members 9 made of stainless steel extending in the vertical direction.

本実施形態において、各補強材９は、図４（ａ）に示すように、幅ｗが１５ｍｍ，厚さｔが１．５ｍｍで、断面が長方形をなすステンレス鋼製のフラット・バー８Ａによって構成され、図２に示すように、二重筒構造の煙突１の中心Ｃを通る直線１０上で互いに対向する位置に振り分けて、図１，図３に示すように、鉛直方向に延在して螺旋状のハゼ掛け８の外周面に溶接１１（図１参照）により取り付けられている。なお、各補強材９として、前記フラット・バー８Ａに代えて、図４（ｂ）に示すように、線径ｄが２〜３ｍｍのステンレス鋼線８Ｂを使用してもよい。   In this embodiment, as shown in FIG. 4A, each reinforcing member 9 is constituted by a flat bar 8A made of stainless steel having a width w of 15 mm, a thickness t of 1.5 mm, and a rectangular cross section. As shown in FIG. 2, it is distributed to positions facing each other on a straight line 10 passing through the center C of the chimney 1 having a double cylinder structure, and is extended in the vertical direction as shown in FIGS. It is attached to the outer peripheral surface of the spiral goby hook 8 by welding 11 (see FIG. 1). In addition, as each reinforcing material 9, it may replace with the said flat bar 8A, and as shown in FIG.4 (b), you may use the stainless steel wire 8B whose wire diameter d is 2-3 mm.

一方、各補強材９を含むスパイラル内筒２は、遮蔽シート１２によって取り巻かれている。遮蔽シート１２は、厚さ１ｍｍ未満程度のカーボンシートやガラスシートなどの耐熱シートを円筒状に形成することにより構成される。   On the other hand, the spiral inner cylinder 2 including the reinforcing members 9 is surrounded by a shielding sheet 12. The shielding sheet 12 is configured by forming a heat-resistant sheet such as a carbon sheet or a glass sheet having a thickness of less than 1 mm in a cylindrical shape.

本実施形態において適用される接続手段５は、図１に示すように、各煙突ユニット１Ａ，１Ｂ，１Ｃにおける外筒３の下端部外周に巻回して溶接により固着した下側フランジ５ａ（但し、煙突ユニット１Ｃの下端部および該下端部外周に巻回固着した下側フランジは図示されていない）と、各煙突ユニット１Ａ，１Ｂ，１Ｃにおける外筒３の上端部外周に巻回して溶接により固着した上側フランジ５ｂ（但し、煙突ユニット１Ａの上端部および該上端部外周に巻回固着した上側フランジは図示されていない）および円周方向等間隔に配置されて下側フランジ５ａと上側フランジ５ｂとを互いに締結するボルト・ナットからなる複数の鉛直締結部材５ｃを備えるフランジ接合によって構成されている。   As shown in FIG. 1, the connecting means 5 applied in the present embodiment is a lower flange 5a (provided that the winding unit 1A, 1B, 1C is wound around the outer periphery of the lower end of the outer cylinder 3 and fixed by welding) The lower flange of the chimney unit 1C and the lower flange wound and fixed to the outer periphery of the lower end are not shown), and are wound around the outer periphery of the upper cylinder 3 of each chimney unit 1A, 1B, 1C and fixed by welding The upper flange 5b (however, the upper end portion of the chimney unit 1A and the upper flange wound and fixed to the outer periphery of the upper end portion are not shown) and the lower flange 5a and the upper flange 5b are arranged at equal intervals in the circumferential direction. It is comprised by the flange joining provided with the some vertical fastening member 5c which consists of a volt | bolt and nut which mutually fastens.

前記構成の二重構造の煙突１によれば、スパイラル内筒２の自重や熱膨張・熱収縮に伴う螺旋方向の伸縮などの螺旋状のハゼ掛け８にかかる負荷は、鉛直方向に延在して螺旋状のハゼ掛け８の外周面に溶接１１により取り付けられている二つの補強材９が負担する。このため、ハゼ掛け８の分離による開きの発生が防止され、スパイラル内筒２の損壊を防止できる。また、螺旋状のハゼ掛け８以外の部位８３が破れて損傷し、この損傷が経時により拡大して最終的に螺旋状のハゼ掛け８のみが残存しても当該ハゼ掛け８は二つの補強材９が支持する。換言するなら、残存した螺旋状のハゼ掛け８の自重を補強材９が負担してハゼ掛け８の崩落を防止する。これにより、二重筒構造の崩壊に伴う断熱材破壊、ひいては二重筒構造の煙突１の機能喪失を防止して、煙突１の延命を達成することができる。   According to the double-stacked chimney 1 having the above-described configuration, the load applied to the spiral goby hook 8 such as the self-weight of the spiral inner cylinder 2 and the expansion and contraction in the spiral direction due to thermal expansion and contraction extends in the vertical direction. Thus, the two reinforcing members 9 attached to the outer peripheral surface of the helical goby hook 8 by welding 11 bear a burden. For this reason, the occurrence of the opening due to the separation of the goby hook 8 is prevented, and the spiral inner cylinder 2 can be prevented from being damaged. Further, even if the portion 83 other than the spiral goby hook 8 is torn and damaged, and this damage expands with time and only the spiral gouge hook 8 finally remains, the goose hook 8 has two reinforcing materials. 9 supports. In other words, the reinforcing material 9 bears the weight of the remaining spiral goby hook 8 to prevent the gouge hook 8 from collapsing. Thereby, the heat insulation material destruction accompanying collapse of a double cylinder structure, and also the loss of function of the chimney 1 of a double cylinder structure can be prevented, and the life extension of the chimney 1 can be achieved.

前記補強材９は、上下方向に延在してスパイラル内筒２に備わる二つによって構成しているが、必要最小数量の二つの補強材９によって、螺旋状のハゼ掛け８にかかる負荷を有効に負担し、ハゼ掛け８の分離による開きの発生および当該ハゼ掛け８の崩落を確実に防止することができる。このため、補強材９の使用数量を削減してコストダウンを図れるばかりか、構造の簡素化および製作の容易化に寄与することが可能となる。   The reinforcing member 9 is composed of two members that extend in the vertical direction and are provided in the spiral inner cylinder 2. However, the load applied to the spiral goby hook 8 is effective by the two minimum reinforcing members 9. Therefore, it is possible to surely prevent the opening due to the separation of the goby hook 8 and the collapse of the gouge hook 8. For this reason, it is possible not only to reduce the use amount of the reinforcing material 9 but also to reduce the cost, and to contribute to the simplification of the structure and the ease of manufacture.

本実施形態のように、二つ補強材９が鉛直方向に延在して螺旋状のハゼ掛け８の外周面に溶接１１により取り付けられていると、各補強材９により螺旋状のハゼ掛け８にかかる負荷を直接負担できるので、ハゼ掛け８の分離による開きの発生および当該ハゼ掛け８の崩落をより一層確実に防止することが可能となる。   When the two reinforcing members 9 extend in the vertical direction and are attached to the outer peripheral surface of the spiral goby hook 8 by welding 11 as in this embodiment, the helical gouge hooks 8 are formed by the reinforcing members 9. Therefore, it is possible to prevent the occurrence of the opening due to the separation of the goby hook 8 and the collapse of the gouge hook 8 more reliably.

二つの補強材９を含むスパイラル内筒２は、遮蔽シート１２によって取り巻かれているので、たとえ螺旋状のハゼ掛け８が開いたり、螺旋状のハゼ掛け８以外の部位８３が破れて損傷しても、遮蔽シート１２によって断熱材４の煙道７への落下を確実に防止して断熱破壊を避け、二重筒構造の煙突１の延命に寄与することができる。   Since the spiral inner cylinder 2 including the two reinforcing members 9 is surrounded by the shielding sheet 12, even if the spiral goby hook 8 is opened or a portion 83 other than the spiral gouge hook 8 is broken and damaged. However, the shielding sheet 12 can surely prevent the heat insulating material 4 from falling into the flue 7 to avoid the heat insulation breakage and contribute to the extension of the life of the chimney 1 having the double cylinder structure.

螺旋状のハゼ掛け８は、図１１に示すように、一方のフック状折り曲げ部８１ａと他方のフック状折り曲げ部８２ａとを、上下に指向して互いに掛け合わせた縦甲ハゼによって構成されていることにより水封機能が確保されるので、例えば、雨水が煙道７に流入したり、冬季の寒冷地における煙突運休時に際してスパイラル内筒２の内面に結露水が発生しても、これらの水の断熱材４側への浸水を確実に防止して、断熱材４を保護することが可能となる。   As shown in FIG. 11, the spiral goby hook 8 is constituted by a vertical upper goby in which one hook-like bent portion 81 a and the other hook-like bent portion 82 a are vertically crossed with each other. Therefore, even if rainwater flows into the flue 7 or if dew condensation occurs on the inner surface of the spiral inner cylinder 2 when the chimney is suspended in a cold region in winter, It becomes possible to protect the heat insulating material 4 by reliably preventing water from entering the heat insulating material 4 side.

また、縦甲ハゼによって構成されている螺旋状のハゼ掛け８は、一方の下向きフック状折り曲げ部８１ａに含まれて内外周で対向する２層と、他方の上向きフック状折り曲げ部８２ａに含まれて内外周で対向する２層とからなる４層構造に仕立てられているので、高熱の継続的な負荷により、上向きフック状折り曲げ部８２ａにおける内周側の１層に、その螺旋方向の一部損傷が生じても、残る３層の協働によって螺旋状のハゼ掛け８の形態破壊を確実に防止することができる。   In addition, the spiral goby hook 8 formed by the vertical goby is included in one of the two downward hook-like bent portions 81a and opposed to the inner and outer circumferences, and the other of the upward hook-like bent portion 82a. Since it is tailored to a four-layer structure consisting of two layers facing each other at the inner and outer periphery, a part of the spiral direction is formed on one layer on the inner peripheral side of the upward hook-shaped bent portion 82a due to a continuous high heat load. Even if the damage occurs, the cooperation of the remaining three layers can reliably prevent the morphological destruction of the spiral goby hook 8.

前記実施形態では、二つの補強材９を使用して説明しているが、補強材９の数量は三つ以上であってもよい。また、螺旋状のハゼ掛け８以外の部位８３に、長手Ｌ方向に延在する断面波形のリブを１条〜複数条形成して、スパイラル内筒２の強度を高めるようにしてもよい。   In the said embodiment, although demonstrated using the two reinforcement materials 9, the number of the reinforcement materials 9 may be three or more. Further, one to a plurality of ribs having a corrugated cross section extending in the longitudinal L direction may be formed in a portion 83 other than the spiral gob hook 8 to increase the strength of the spiral inner cylinder 2.

本発明に係る二重筒構造の煙突１は、前記実施形態のみに限定されるものではなく、その趣旨および技術思想を逸脱しない範囲であれば、構造変形が可能である。   The chimney 1 having a double-cylinder structure according to the present invention is not limited to the above-described embodiment, and can be structurally modified as long as it does not depart from the spirit and technical idea thereof.

本発明の二重筒構造の煙突は、非常用発電機を駆動するガスタービンエンジンやディーゼルエンジンの排ガス，ボイラー排ガス或いは産業廃棄物焼却炉の排ガスなどを高所に導いて放散させる大径かつ長寸の大型煙突の構築に有用である。   The chimney having a double-cylinder structure of the present invention has a large diameter and long length that guides and dissipates exhaust gas from a gas turbine engine or diesel engine that drives an emergency generator, boiler exhaust gas, or industrial waste incinerator exhaust gas to a high place. Useful for the construction of large-sized chimneys.

１ 二重筒構造の煙突
２ スパイラル内筒（内筒）
３ 外筒
４ 断熱材
８ 螺旋状のハゼ掛け
９ 補強材
１２ 遮蔽シート 1 Chimney with double cylinder structure 2 Spiral inner cylinder (inner cylinder)
3 Outer cylinder 4 Heat insulation material 8 Spiral goby 9 Reinforcement material 12 Shielding sheet

本発明は、内筒と、この内筒を取り囲む外筒との間に断熱材を装填した二重筒構造の煙突に係り、例えば、非常用発電機を駆動するガスタービンエンジンやディーゼルエンジンの排ガス、ボイラー排ガスあるいは産業廃棄物焼却炉の排ガスなどを高所に導いて放散させる大径かつ長寸の大型煙突として好適な二重筒構造の煙突に関するものである。   The present invention relates to a chimney having a double cylinder structure in which a heat insulating material is loaded between an inner cylinder and an outer cylinder surrounding the inner cylinder, for example, exhaust gas from a gas turbine engine or a diesel engine that drives an emergency generator. The present invention relates to a chimney having a double tube structure suitable as a large-diameter and long-sized large chimney for guiding and radiating boiler exhaust gas or industrial waste incinerator exhaust gas to a high place.

従来、内筒と、この内筒を取り囲む外筒との間に断熱材を装填した二重筒構造の煙突として、特許文献１に記載のものが提供されている。この二重筒構造の煙突を図５，図６に示す。   Conventionally, as a chimney having a double cylinder structure in which a heat insulating material is loaded between an inner cylinder and an outer cylinder surrounding the inner cylinder, the one described in Patent Document 1 is provided. The chimney of this double cylinder structure is shown in FIGS.

図５，図６に示す二重筒構造の煙突１は、ステンレス鋼板からなる横断面円形の内筒２と、亜鉛メッキ鋼板からなる横断面円形の外筒３との間の環状空間に断熱材４を装填した二重筒構造の煙突ユニットの複数１Ａ，１Ｂ，１Ｃを上下に配置するとともに、直上と直下で互いに対向する一対の煙突ユニット１Ａと１Ｂおよび１Ｂと１Ｃを嵌め合い構造を主とする接続手段５により互いに接続することにより構築されている。   The chimney 1 having a double-cylinder structure shown in FIGS. 5 and 6 includes a heat insulating material in an annular space between an inner cylinder 2 having a circular cross section made of a stainless steel plate and an outer cylinder 3 having a circular cross section made of a galvanized steel plate. A plurality of chimney units 1A, 1B, 1C of a double cylinder structure loaded with 4 are arranged vertically and a pair of chimney units 1A and 1B and 1B and 1C facing each other directly above and below are mainly fitted. It is constructed by connecting to each other by connecting means 5 to be connected.

前記二重筒構造の煙突１では、その運転時、内筒２は高温（６５０℃）の排ガスに晒され、高熱が継続的に負荷されるので破れにより損傷する。この損傷が経時により拡大すると、内筒２は主として座屈により損壊して二重筒構造が崩壊し、断熱材４が煙道７に落下する断熱破壊を招いて煙突１の機能が喪失する。このような経緯による二重筒構造の煙突１の機能喪失をできる限り遅らせる目的で、内筒２は耐熱強度の高いステンレス鋼板によって製作している。しかし、高熱の継続的負荷による内筒２の損傷を阻止することはできない。   In the double-stacked chimney 1, during operation, the inner cylinder 2 is exposed to high-temperature (650 ° C.) exhaust gas and is continuously loaded with high heat, and is damaged due to tearing. When this damage expands with time, the inner cylinder 2 is damaged mainly by buckling, the double cylinder structure is collapsed, and the function of the chimney 1 is lost due to the adiabatic breakdown of the heat insulating material 4 falling into the flue 7. For the purpose of delaying as much as possible the loss of function of the chimney 1 having the double cylinder structure due to such circumstances, the inner cylinder 2 is made of a stainless steel plate having high heat resistance. However, it is not possible to prevent damage to the inner cylinder 2 due to a continuous load of high heat.

一方、この種の二重筒構造の煙突１では、その口径（内筒２の内径）が大きく（２００ｍｍ〜１５００ｍｍ）設定される。ところが、内筒２は薄肉であるため引き抜き手法などによりシームレス（継目無し）に製作することはできない。このため、シームウエルド（継目溶接）した直筒型の内筒２が使用される。しかし、この種の内筒２は、その製作に手間がかかってコスト高を招くばかりか強度が弱い。しかも、二重筒構造の煙突１は、その高さが１０ｍにも達するので、各煙突ユニット１Ａ，１Ｂ，１Ｃおよびこれらの内筒２の高さが高くなり、内筒２の座屈荷重は小さくなる。また、高熱負荷の継続により損傷すると、座屈荷重がさらに小さくなって、損傷度が比較的小さくても（破れが比較的小さくても）、座屈により内筒２が損壊して二重筒構造が崩壊し、断熱材４の煙道７落下に伴う断熱破壊を招いて、二重筒構造の煙突１の機能は喪失する。特に、軸方向に最大圧縮荷重が負荷される最下位の煙突ユニット１Ｃでは、座屈による内筒２の損壊が最も懸念され、これが二重筒構造の煙突１の機能喪失を早めて短命にしている。   On the other hand, in the chimney 1 having this type of double cylinder structure, the diameter (inner diameter of the inner cylinder 2) is set large (200 mm to 1500 mm). However, since the inner cylinder 2 is thin, it cannot be manufactured seamlessly (with no seams) by a drawing method or the like. For this reason, a straight cylinder type inner cylinder 2 subjected to seam welding (seam welding) is used. However, the inner cylinder 2 of this type is troublesome in its production, resulting in high costs and low strength. Moreover, since the chimney 1 having a double cylinder structure reaches a height of 10 m, the height of each chimney unit 1A, 1B, 1C and these inner cylinders 2 is increased, and the buckling load of the inner cylinder 2 is Get smaller. Further, if the damage is caused by the continuous high heat load, the buckling load is further reduced, and even if the degree of damage is relatively small (even if the tear is relatively small), the inner cylinder 2 is damaged by the buckling and the double cylinder The structure collapses, causing a heat insulation breakage due to the fall of the flue 7 of the heat insulating material 4, and the function of the chimney 1 having the double cylinder structure is lost. In particular, in the lowest chimney unit 1C in which the maximum compressive load is applied in the axial direction, the inner cylinder 2 is most likely to be damaged due to buckling, and this shortens the function loss of the chimney 1 having the double cylinder structure and shortens the life. Yes.

他方、高温の排ガスに晒される内筒２は温度変化によって伸縮（熱膨張・熱収縮）する。高さが１０ｍの二重筒構造の煙突１において、内筒２が６５０℃の排ガスに晒された高温時と運休時（常温時）の軸方向の伸縮幅は、１１４．４ｍｍであることが確認されている。このような伸縮を吸収するため、直筒型の内筒２では、例えば滑式の伸縮吸収機構（図示省略）を組み込む必要があり、その分、部品点数が増加して構造が複雑になり、製作工数が増すとともにコスト高を招くことになる。   On the other hand, the inner cylinder 2 exposed to high-temperature exhaust gas expands and contracts (thermal expansion and thermal contraction) due to a temperature change. In the chimney 1 having a double cylinder structure having a height of 10 m, the expansion / contraction width in the axial direction when the inner cylinder 2 is exposed to exhaust gas at 650 ° C. and when it is suspended (at room temperature) is 114.4 mm. It has been confirmed. In order to absorb such expansion and contraction, it is necessary to incorporate, for example, a sliding expansion / contraction absorption mechanism (not shown) in the straight cylinder type inner cylinder 2, which increases the number of parts and makes the structure complicated and manufactured. As the number of steps increases, the cost increases.

そこで、前記特許文献１に記載の内筒２の欠点を改善した内筒を備える二重筒構造の煙突１が提供されている。この二重筒構造の煙突１を図７，図８に示す。これらの図において、二重筒構造の煙突１は、ステンレス鋼板からなる横断面円形の内筒２と、亜鉛メッキ鋼板からなる横断面円形の外筒３との間の環状空間に断熱材４を装填した二重筒構造の煙突ユニットの複数１Ａ，１Ｂ，１Ｃを上下に配置するとともに、直上と直下で互いに対向する一対の煙突ユニット１Ａと１Ｂおよび１Ｂと１Ｃを、パッキン６を介在させて接続手段５により接続することによって構築される。   Therefore, a double-stacked chimney 1 having an inner cylinder in which the disadvantages of the inner cylinder 2 described in Patent Document 1 are improved is provided. The chimney 1 having the double cylinder structure is shown in FIGS. In these figures, a chimney 1 having a double cylinder structure has a heat insulating material 4 in an annular space between an inner cylinder 2 having a circular cross section made of a stainless steel plate and an outer cylinder 3 having a circular cross section made of a galvanized steel plate. A plurality of stacked double-stacked chimney units 1A, 1B, and 1C are arranged vertically, and a pair of chimney units 1A and 1B and 1B and 1C facing each other immediately above and directly below are connected via a packing 6. It is constructed by connecting by means 5.

各煙突ユニット１Ａ，１Ｂ，１Ｃにおける内筒２は、図８，図９に示すように、螺旋状のハゼ掛け８を備えるスパイラル内筒２からなる。螺旋状のハゼ掛け８は、例えば、板取りにより図１０（ａ）に示すステンレス鋼板からなる斜め帯状の原板８０を用意し、この原板８０の幅方向一端部（左端部）８１に長手方向の全長に亙って図１０（ｂ）に示す一方のフック状折り曲げ部８１ａを形成するとともに、図１０（ａ）の原板８０の幅方向他端部（右端部）８２に長手方向の全長に亙って図１０（ｃ）に示す他方のフック状折り曲げ部８２ａを形成する。つぎに、原板８０を円筒状の芯型（図示省略）外周にあてがって適宜螺旋状に巻回する工程の進行に同期して、前記一方のフック状折り曲げ部８１ａと他方のフック状折り曲げ部８２ａとを、図１１に示すように、上下に指向して互いに掛け合わせる工程を進行させる手法によって、上下に指向する、所謂、縦甲ハゼからなる螺旋状のハゼ掛け８を備えるスパイラル内筒２を製作できる。   The inner cylinder 2 in each chimney unit 1A, 1B, 1C consists of the spiral inner cylinder 2 provided with the spiral goby hook 8, as shown in FIGS. The spiral goblet 8 is prepared by, for example, preparing a slanted strip-shaped base plate 80 made of a stainless steel plate shown in FIG. 10 (a) by plate cutting, and extending in the longitudinal direction at one end portion (left end portion) 81 of the original plate 80 in the longitudinal direction. A hook-shaped bent portion 81a shown in FIG. 10B is formed over the entire length, and the other end portion (right end portion) in the width direction of the original plate 80 in FIG. Thus, the other hook-shaped bent portion 82a shown in FIG. 10 (c) is formed. Next, the one hook-shaped bent portion 81a and the other hook-shaped bent portion 82a are synchronized with the progress of the process of winding the original plate 80 on the outer periphery of a cylindrical core (not shown) as appropriate. As shown in FIG. 11, the spiral inner cylinder 2 having a spiral goby hook 8 made of a so-called vertical goby, which is directed vertically, by a method of proceeding a process of multiplying them vertically and multiplying each other, as shown in FIG. Can be produced.

螺旋状のハゼ掛け８を備えるスパイラル内筒２は、特許文献１に記載のシームウエルド（継目溶接）した直筒型の内筒２よりも製作が容易なためコストダウンを図れる。また、剛性の高いハゼ掛け８が螺旋状に備わっていることにより強度が高くなって、軸方向と径方向の圧縮応力がそれぞれ大きくなり、軸方向の圧縮応力が大きくなることで座屈荷重が増大し、座屈による損壊を抑えることができる。したがって、高熱負荷の継続により螺旋状のハゼ掛け８以外の部位８３［図１０（ａ）において、原板８０の幅Ｗ方向一端部８１と幅Ｗ方向他端部８２の間の平坦な部位］が破れて損傷しても、損傷度が相当大きくなって座屈荷重が相当小さくなるまで座屈しない。このため、軸方向に最大圧縮荷重が負荷される最下位の煙突ユニット１Ｃにおける内筒２の座屈による損壊を有効に抑え、二重筒構造の煙突１の機能喪失を遅延することで延命を達成できる。   The spiral inner cylinder 2 having the spiral gob hook 8 is easier to manufacture than the seam-welded (cylindrical) inner cylinder 2 described in Patent Document 1, so that the cost can be reduced. Further, the strength of the goby hook 8 having high rigidity is increased, and the compressive stress in the axial direction and the radial direction is increased, and the compressive stress in the axial direction is increased, so that the buckling load is increased. It increases and can suppress the damage by buckling. Accordingly, the portion 83 other than the spiral gob hook 8 due to continuation of the high heat load [in FIG. 10A, the flat portion between the width W direction one end portion 81 and the width W direction other end portion 82 of the original plate 80]. Even if it is torn and damaged, it will not buckle until the degree of damage is significantly increased and the buckling load is significantly reduced. For this reason, it is possible to effectively suppress the damage caused by buckling of the inner cylinder 2 in the lowest chimney unit 1C in which the maximum compressive load is applied in the axial direction, and to prolong the life by delaying the loss of function of the chimney 1 having the double cylinder structure. Can be achieved.

また、スパイラル内筒２の熱膨張・熱収縮は、ハゼ掛け８の螺旋方向の伸縮に変換して吸収できるので、特許文献１に記載の内筒２において必要とされる伸縮吸収機構（例えば滑式の伸縮吸収機構）の組み込みが不要になり、部品点数の削減、構造の簡略化および製作工数の低減が達成されて、コストダウンが可能となる。   In addition, since the thermal expansion / contraction of the spiral inner cylinder 2 can be absorbed by being converted into expansion / contraction in the spiral direction of the gob hook 8, the expansion / contraction absorption mechanism (for example, sliding) required in the inner cylinder 2 described in Patent Document 1 can be absorbed. Incorporation of an expansion / contraction absorption mechanism) is not required, reducing the number of parts, simplifying the structure, and reducing the number of manufacturing steps, thereby reducing the cost.

ところが、螺旋状のハゼ掛け８を備えるスパイラル内筒２では、スパイラル内筒２の自重や熱膨張・熱収縮に伴う螺旋方向の伸縮などの負荷が螺旋状のハゼ掛け８にかかるので、一方の折り曲げ部８１ａと他方の折り曲げ部８２ａとの掛け合せが外れて分離し、開きが発生するおそれを有する。開きが発生しても、この開きが極小で局部的なものであれば、二重筒構造の煙突１の機能は保持されて、運行に支障をきたす事態は起こらないので無視することができる。しかし、経時により分離度が大きくなって開きが拡大すると、内筒２が損壊して二重筒構造が崩壊し、断熱材４が煙道７に落下する断熱破壊を招いて二重筒構造の煙突１の機能を喪失させる。   However, in the spiral inner cylinder 2 provided with the spiral goby hook 8, since the load such as the expansion and contraction in the spiral direction due to the self-weight of the spiral inner cylinder 2 and thermal expansion and contraction is applied to the spiral gouge hook 8, There is a possibility that the folded portion 81a and the other folded portion 82a are separated from each other and separated to cause an opening. Even if the opening occurs, if the opening is minimal and local, the function of the chimney 1 having the double cylinder structure is maintained, and the situation that does not hinder the operation does not occur and can be ignored. However, when the degree of separation increases with time and the opening expands, the inner cylinder 2 is damaged, the double cylinder structure is collapsed, and the heat insulating material 4 falls into the flue 7, causing adiabatic destruction and the double cylinder structure. The function of the chimney 1 is lost.

また、高熱負荷の継続により螺旋状のハゼ掛け８以外の部位８３が破れて損傷し、この破れが経時による損傷度が拡大すると、最終的に螺旋状のハゼ掛け８のみが残存して崩落するスパイラル内筒２の損壊が起こり、二重筒構造が崩壊し、断熱材４が煙道７に落下する断熱破壊を招いて二重筒構造の煙突１の機能を喪失させる。   Further, when the high heat load is continued, the portion 83 other than the spiral goby hook 8 is broken and damaged, and when the damage increases with time, only the spiral gouge hook 8 finally remains and collapses. The spiral inner cylinder 2 is damaged, the double cylinder structure is collapsed, and the heat insulating material 4 is dropped into the flue 7 to cause the adiabatic breakdown, and the function of the chimney 1 having the double cylinder structure is lost.

特開２００４−７７０４６号公報JP 2004-77046 A

本発明は、上記の実情に鑑みてなされたもので、剛性の高いハゼ掛けが螺旋状に備わっていることにより座屈荷重が増大したスパイラル内筒を備える二重構造の煙突でありながら、前記ハゼ掛けを含む内筒にかかる負荷を補強材で負担することにより当該内筒の損壊を防止し、二重筒構造の崩壊に伴う断熱材破壊、延いては二重筒構造の煙突の機能喪失を防止して延命を達成することができる二重構造の煙突の提供を目的とするものである。   The present invention has been made in view of the above circumstances, and is a double-structured chimney including a spiral inner cylinder having a buckling load increased by providing a highly rigid goby hook spirally. By bearing the load on the inner cylinder, including the haze, with the reinforcing material, the inner cylinder is prevented from being damaged, the insulation material is destroyed due to the collapse of the double cylinder structure, and the chimney of the double cylinder structure is lost. The purpose of this invention is to provide a chimney having a double structure capable of preventing the above-mentioned problems and achieving a long life.

前記目的を達成するために、本発明に係る二重構造の煙突は、螺旋状のハゼ掛けを備えるスパイラル内筒と、この内筒を取り囲む外筒との間に断熱材を装填した二重筒構造の煙突において、
鉛直方向に延在する少なくとも二つの補強材が、前記スパイラル内筒の螺旋状のハゼ掛けの外周面に取り付けられていることを特徴とするものである。 In order to achieve the above object, a double-stacked chimney according to the present invention has a double cylinder in which a heat insulating material is loaded between a spiral inner cylinder having a spiral goblet and an outer cylinder surrounding the inner cylinder. In the chimney of the structure,
At least two reinforcing members extending in the vertical direction are attached to the outer peripheral surface of the spiral goby hook of the spiral inner cylinder.

前記構成の二重筒構造の煙突によると、スパイラル内筒の自重や熱膨張・熱収縮に伴う螺旋方向の伸縮などの螺旋状のハゼ掛けにかかる負荷は、鉛直方向に延在して当該螺旋状のハゼ掛けの外周面に取り付けられている少なくとも二つの補強材が負担する。このため、ハゼ掛けの分離による開きの発生が防止され、スパイラル内筒の損壊を防止できる。また、螺旋状のハゼ掛け以外の部位の損傷拡大で最終的にハゼ掛けのみが残存しても、残存した螺旋状のハゼ掛けは補強材が支持する。換言するなら、残存した螺旋状のハゼ掛けの自重を補強材が負担してハゼ掛けの崩落を防止する。これにより、二重筒構造の崩壊に伴う断熱材破壊、延いては二重筒構造の煙突の機能喪失を防止して、煙突の延命を達成することができる。 According to the chimney having the above-described double cylinder structure, the load applied to the spiral goby hook such as the self weight of the spiral inner cylinder and the expansion and contraction in the spiral direction due to thermal expansion and contraction extends in the vertical direction. The at least two reinforcing members attached to the outer peripheral surface of the goby hook bear. For this reason, the generation | occurrence | production of the opening by separation of a goblet is prevented, and damage to a spiral inner cylinder can be prevented. In addition, even if only the goby hook is finally left due to the damage expansion of the portion other than the helical goby hook, the remaining helical gouge hook is supported by the reinforcing material. In other words, the reinforcing material bears the weight of the remaining spiral goby hook to prevent the fall of the goby hook. Thereby, it is possible to prevent the heat insulation material destruction due to the collapse of the double cylinder structure, and thus the loss of function of the chimney of the double cylinder structure, and to achieve the life extension of the chimney.

本発明に係る二重構造の煙突によれば、補強材によってハゼ掛けを含む内筒にかかる負荷が負担されるので、ハゼ掛けの分離による開きの発生および当該ハゼ掛けの崩落が防止される。これにより、二重筒構造の崩壊に伴う断熱材破壊、延いては二重筒構造の煙突の機能喪失を防止して、煙突の延命を達成することができる。   According to the double-structured chimney according to the present invention, the load applied to the inner cylinder including the goby hook is borne by the reinforcing material, so that the opening due to the separation of the gouge hook and the collapse of the gouge hook are prevented. Thereby, it is possible to prevent the heat insulation material destruction due to the collapse of the double cylinder structure, and thus the loss of function of the chimney of the double cylinder structure, and to achieve the life extension of the chimney.

本発明に係る二重筒構造の煙突の一実施形態を一部省略し、内筒、ハゼ掛け、補強材以外を半截断面で示す正面図である。It is a front view which omits some one embodiment of the chimney of the double cylinder structure which concerns on this invention, and shows a semi-cylindrical cross section except an inner cylinder, a goby hook, and a reinforcing material . 図１のＡ−Ａ線に沿う拡大横断平面図である。FIG. 2 is an enlarged transverse plan view taken along line AA in FIG. 1. スパイラル内筒の一実施形態を拡大して示す正面図である( 遮蔽シートのみ断面で示す) 。It is a front view which expands and shows one Embodiment of a spiral inner cylinder (only a shielding sheet is shown by a cross section). 図４（ａ）は補強材の一例を部分的に示す斜視図であり、図４（ｂ）は補強材の他の例を部分的に示す斜視図である。FIG. 4A is a perspective view partially showing an example of the reinforcing material, and FIG. 4B is a perspective view partially showing another example of the reinforcing material. 第１従来例における煙突ユニットの正面図である。It is a front view of the chimney unit in the 1st conventional example. 第１従来例における煙突ユニットの接続状態を示す一部を省略した断面図である。It is sectional drawing which abbreviate | omitted one part which shows the connection state of the chimney unit in a 1st prior art example. 第２従来例に係る二重筒構造の煙突を一部省略して半截断面で示した正面図である。It is the front view which abbreviate | omitted a part of the chimney of the double cylinder structure which concerns on a 2nd prior art example, and showed with the semi-cylindrical cross section. 図７のＢ−Ｂ線に沿う拡大横断平面図である。FIG. 8 is an enlarged cross-sectional plan view taken along line BB in FIG. 7. 第２従来例に適用される螺旋状のハゼ掛けを備えるスパイラル内筒の正面図である。It is a front view of a spiral inner cylinder provided with the spiral goby hook applied to the 2nd conventional example. 図１０（ａ）は原板の正面図を示し、図１０（ｂ）は一方のフック状折り曲げ部の説明図であり、図１０（ｃ）は他方のフック状折り曲げ部の説明図である。FIG. 10A is a front view of the original plate, FIG. 10B is an explanatory view of one hook-shaped bent portion, and FIG. 10C is an explanatory view of the other hook-shaped bent portion. 螺旋状のハゼ掛けを拡大して示す断面説明図である。It is sectional explanatory drawing which expands and shows a spiral goby hook.

以下、本発明に係る二重筒構造の煙突の好ましい実施形態を図面に基づいて説明する。図１は本発明に係る二重筒構造の煙突の一実施形態を一部省略し、内筒２、ハゼ掛け８、補強剤９以外を半截断面で示す正面図、図２は図１のＡ−Ａ線に沿う横断平面、図３はスパイラル内筒の一実施形態を拡大して示す正面図である( 遮蔽シート１２のみ断面で示す) 。なお、前記第１および第２従来例と同一もしくは相当部分には同一符号を付して説明する。   Hereinafter, a preferred embodiment of a chimney having a double cylinder structure according to the present invention will be described with reference to the drawings. FIG. 1 is a front view of a chimney having a double-cylinder structure according to the present invention, in which a part of the chimney according to the present invention is omitted, except for the inner cylinder 2, the goose hook 8 and the reinforcing agent 9. FIG. 3 is an enlarged front view showing one embodiment of the spiral inner cylinder (only the shielding sheet 12 is shown in cross section). The same or corresponding parts as those in the first and second conventional examples will be described with the same reference numerals.

図１〜図３において、二重筒構造の煙突１は、ステンレス鋼板からなる横断面円形の内筒２と、亜鉛メッキ鋼板からなる横断面円形の外筒３との間の環状空間に、ロックウール，セラミックウール，ガラスウールなどの繊維質素材からなる断熱材４を装填した二重筒構造の煙突ユニットの複数１Ａ，１Ｂ，１Ｃを、突き合わせ構造により上下に配置するとともに、直上と直下で互いに対向する一対の煙突ユニット１Ａと１Ｂおよび１Ｂと１Ｃを、パッキン６を介在させて接続手段５により接続することによって構築される。前記パッキン６は、環状を呈するガラス繊維のマット状成形体からなる耐熱パッキンによって構成されている。   1 to 3, a chimney 1 having a double cylinder structure is locked in an annular space between an inner cylinder 2 having a circular cross section made of a stainless steel plate and an outer cylinder 3 having a circular cross section made of a galvanized steel plate. A plurality of chimney units 1A, 1B, and 1C having a double cylinder structure loaded with a heat insulating material 4 made of a fibrous material such as wool, ceramic wool, and glass wool are vertically arranged by a butting structure, and are directly above and below each other. It is constructed by connecting a pair of opposed chimney units 1A and 1B and 1B and 1C by a connecting means 5 with a packing 6 interposed therebetween. The packing 6 is constituted by a heat-resistant packing made of a glass fiber mat-like molded body having an annular shape.

各煙突ユニット１Ａ，１Ｂ，１Ｃにおける内筒２は、図９に示す従来の内筒２と同様に、図１１に示す縦甲ハゼからなる螺旋状のハゼ掛け８を備えており、図１〜図３に示すように、その外周には、鉛直方向に延在するステンレス鋼製の二つの補強材９を備えている。 The inner cylinder 2 in each of the chimney units 1A, 1B, 1C is provided with a spiral goby hook 8 made of a vertical goby shown in FIG. 11, like the conventional inner cylinder 2 shown in FIG. As shown in FIG. 3, two reinforcing members 9 made of stainless steel extending in the vertical direction are provided on the outer periphery thereof.

本実施形態において、各補強材９は、図４（ａ）に示すように、幅ｗが１５ｍｍ，厚さｔが１．５ｍｍで、断面が長方形をなすステンレス鋼製のフラット・バー８Ａによって構成され、図２に示すように、二重筒構造の煙突１の中心Ｃを通る直線１０上で互いに対向する位置に振り分けて、図１，図３に示すように、鉛直方向に延在して螺旋状のハゼ掛け８の外周面に溶接１１（図１参照）により取り付けられている。なお、各補強材９として、前記フラット・バー８Ａに代えて、図４（ｂ）に示すように、線径ｄが２〜３ｍｍのステンレス鋼線８Ｂを使用してもよい。   In this embodiment, as shown in FIG. 4A, each reinforcing member 9 is constituted by a flat bar 8A made of stainless steel having a width w of 15 mm, a thickness t of 1.5 mm, and a rectangular cross section. As shown in FIG. 2, it is distributed to positions facing each other on a straight line 10 passing through the center C of the chimney 1 having a double cylinder structure, and is extended in the vertical direction as shown in FIGS. It is attached to the outer peripheral surface of the spiral goby hook 8 by welding 11 (see FIG. 1). In addition, as each reinforcing material 9, it may replace with the said flat bar 8A, and as shown in FIG.4 (b), you may use the stainless steel wire 8B whose wire diameter d is 2-3 mm.

一方、各補強材９を含むスパイラル内筒２は、遮蔽シート１２によって取り巻かれている。遮蔽シート１２は、厚さ１ｍｍ未満程度のカーボンシートやガラスシートなどの耐熱シートを円筒状に形成することにより構成される。   On the other hand, the spiral inner cylinder 2 including the reinforcing members 9 is surrounded by a shielding sheet 12. The shielding sheet 12 is configured by forming a heat-resistant sheet such as a carbon sheet or a glass sheet having a thickness of less than 1 mm in a cylindrical shape.

本実施形態において適用される接続手段５は、図１に示すように、各煙突ユニット１Ａ，１Ｂ，１Ｃにおける外筒３の下端部外周に巻回して溶接により固着した下側フランジ５ａ（但し、煙突ユニット１Ｃの下端部および該下端部外周に巻回固着した下側フランジは図示されていない）と、各煙突ユニット１Ａ，１Ｂ，１Ｃにおける外筒３の上端部外周に巻回して溶接により固着した上側フランジ５ｂ（但し、煙突ユニット１Ａの上端部および該上端部外周に巻回固着した上側フランジは図示されていない）および円周方向等間隔に配置されて下側フランジ５ａと上側フランジ５ｂとを互いに締結するボルト・ナットからなる複数の鉛直締結部材５ｃを備えるフランジ接合によって構成されている。   As shown in FIG. 1, the connecting means 5 applied in the present embodiment is a lower flange 5a (provided that the winding unit 1A, 1B, 1C is wound around the outer periphery of the lower end of the outer cylinder 3 and fixed by welding) The lower flange of the chimney unit 1C and the lower flange wound and fixed to the outer periphery of the lower end are not shown), and are wound around the outer periphery of the upper cylinder 3 of each chimney unit 1A, 1B, 1C and fixed by welding The upper flange 5b (however, the upper end portion of the chimney unit 1A and the upper flange wound and fixed to the outer periphery of the upper end portion are not shown) and the lower flange 5a and the upper flange 5b are arranged at equal intervals in the circumferential direction. It is comprised by the flange joining provided with the some vertical fastening member 5c which consists of a volt | bolt and nut which mutually fastens.

前記構成の二重構造の煙突１によれば、スパイラル内筒２の自重や熱膨張・熱収縮に伴う螺旋方向の伸縮などの螺旋状のハゼ掛け８にかかる負荷は、鉛直方向に延在して螺旋状のハゼ掛け８の外周面に溶接１１により取り付けられている二つの補強材９が負担する。このため、ハゼ掛け８の分離による開きの発生が防止され、スパイラル内筒２の損壊を防止できる。また、螺旋状のハゼ掛け８以外の部位８３が破れて損傷し、この損傷が経時により拡大して最終的に螺旋状のハゼ掛け８のみが残存しても当該ハゼ掛け８は二つの補強材９が支持する。換言するなら、残存した螺旋状のハゼ掛け８の自重を補強材９が負担してハゼ掛け８の崩落を防止する。これにより、二重筒構造の崩壊に伴う断熱材破壊、ひいては二重筒構造の煙突１の機能喪失を防止して、煙突１の延命を達成することができる。   According to the double-stacked chimney 1 having the above-described configuration, the load applied to the spiral goby hook 8 such as the self-weight of the spiral inner cylinder 2 and the expansion and contraction in the spiral direction due to thermal expansion and contraction extends in the vertical direction. Thus, the two reinforcing members 9 attached to the outer peripheral surface of the helical goby hook 8 by welding 11 bear a burden. For this reason, the occurrence of the opening due to the separation of the goby hook 8 is prevented, and the spiral inner cylinder 2 can be prevented from being damaged. Further, even if the portion 83 other than the spiral goby hook 8 is torn and damaged, and this damage expands with time and only the spiral gouge hook 8 finally remains, the goose hook 8 has two reinforcing materials. 9 supports. In other words, the reinforcing material 9 bears the weight of the remaining spiral goby hook 8 to prevent the gouge hook 8 from collapsing. Thereby, the heat insulation material destruction accompanying collapse of a double cylinder structure, and also the loss of function of the chimney 1 of a double cylinder structure can be prevented, and the life extension of the chimney 1 can be achieved.

前記補強材９は、鉛直方向に延在してスパイラル内筒２に備わる二つによって構成しているが、必要最小数量の二つの補強材９によって、螺旋状のハゼ掛け８にかかる負荷を有効に負担し、ハゼ掛け８の分離による開きの発生および当該ハゼ掛け８の崩落を確実に防止することができる。このため、補強材９の使用数量を削減してコストダウンを図れるばかりか、構造の簡素化および製作の容易化に寄与することが可能となる。 The reinforcing member 9 is composed of two members extending in the vertical direction and provided in the spiral inner cylinder 2, but the load applied to the spiral goby hook 8 is effective by the two minimum reinforcing members 9. Therefore, it is possible to surely prevent the opening due to the separation of the goby hook 8 and the collapse of the gouge hook 8. For this reason, it is possible not only to reduce the use amount of the reinforcing material 9 but also to reduce the cost, and to contribute to the simplification of the structure and the ease of manufacture.

本実施形態のように、二つ補強材９が鉛直方向に延在して螺旋状のハゼ掛け８の外周面に溶接１１により取り付けられていると、各補強材９により螺旋状のハゼ掛け８にかかる負荷を直接負担できるので、ハゼ掛け８の分離による開きの発生および当該ハゼ掛け８の崩落をより一層確実に防止することが可能となる。   When the two reinforcing members 9 extend in the vertical direction and are attached to the outer peripheral surface of the spiral goby hook 8 by welding 11 as in this embodiment, the helical gouge hooks 8 are formed by the reinforcing members 9. Therefore, it is possible to prevent the occurrence of the opening due to the separation of the goby hook 8 and the collapse of the gouge hook 8 more reliably.

二つの補強材９を含むスパイラル内筒２は、遮蔽シート１２によって取り巻かれているので、たとえ螺旋状のハゼ掛け８が開いたり、螺旋状のハゼ掛け８以外の部位８３が破れて損傷しても、遮蔽シート１２によって断熱材４の煙道７への落下を確実に防止して断熱破壊を避け、二重筒構造の煙突１の延命に寄与することができる。   Since the spiral inner cylinder 2 including the two reinforcing members 9 is surrounded by the shielding sheet 12, even if the spiral goby hook 8 is opened or a portion 83 other than the spiral gouge hook 8 is broken and damaged. However, the shielding sheet 12 can surely prevent the heat insulating material 4 from falling into the flue 7 to avoid the heat insulation breakage and contribute to the extension of the life of the chimney 1 having the double cylinder structure.

螺旋状のハゼ掛け８は、図１１に示すように、一方のフック状折り曲げ部８１ａと他方のフック状折り曲げ部８２ａとを、上下に指向して互いに掛け合わせた縦甲ハゼによって構成されていることにより水封機能が確保されるので、例えば、雨水が煙道７に流入したり、冬季の寒冷地における煙突運休時に際してスパイラル内筒２の内面に結露水が発生しても、これらの水の断熱材４側への浸水を確実に防止して、断熱材４を保護することが可能となる。   As shown in FIG. 11, the spiral goby hook 8 is constituted by a vertical upper goby in which one hook-like bent portion 81 a and the other hook-like bent portion 82 a are vertically crossed with each other. Therefore, even if rainwater flows into the flue 7 or if dew condensation occurs on the inner surface of the spiral inner cylinder 2 when the chimney is suspended in a cold region in winter, It becomes possible to protect the heat insulating material 4 by reliably preventing water from entering the heat insulating material 4 side.

また、縦甲ハゼによって構成されている螺旋状のハゼ掛け８は、一方の下向きフック状折り曲げ部８１ａに含まれて内外周で対向する２層と、他方の上向きフック状折り曲げ部８２ａに含まれて内外周で対向する２層とからなる４層構造に仕立てられているので、高熱の継続的な負荷により、上向きフック状折り曲げ部８２ａにおける内周側の１層に、その螺旋方向の一部損傷が生じても、残る３層の協働によって螺旋状のハゼ掛け８の形態破壊を確実に防止することができる。   In addition, the spiral goby hook 8 formed by the vertical goby is included in one of the two downward hook-like bent portions 81a and opposed to the inner and outer circumferences, and the other of the upward hook-like bent portion 82a. Since it is tailored to a four-layer structure consisting of two layers facing each other at the inner and outer periphery, a part of the spiral direction is formed on one layer on the inner peripheral side of the upward hook-shaped bent portion 82a due to a continuous high heat load. Even if the damage occurs, the cooperation of the remaining three layers can reliably prevent the morphological destruction of the spiral goby hook 8.

前記実施形態では、二つの補強材９を使用して説明しているが、補強材９の数量は三つ以上であってもよい。   In the said embodiment, although demonstrated using the two reinforcement materials 9, the number of the reinforcement materials 9 may be three or more.

本発明に係る二重筒構造の煙突１は、前記実施形態のみに限定されるものではなく、その趣旨および技術思想を逸脱しない範囲であれば、構造変形が可能である。   The chimney 1 having a double-cylinder structure according to the present invention is not limited to the above-described embodiment, and can be structurally modified as long as it does not depart from the spirit and technical idea thereof.

本発明の二重筒構造の煙突は、非常用発電機を駆動するガスタービンエンジンやディーゼルエンジンの排ガス，ボイラー排ガス或いは産業廃棄物焼却炉の排ガスなどを高所に導いて放散させる大径かつ長寸の大型煙突の構築に有用である。   The chimney having a double-cylinder structure of the present invention has a large diameter and long length that guides and dissipates exhaust gas from a gas turbine engine or diesel engine that drives an emergency generator, boiler exhaust gas, or industrial waste incinerator exhaust gas to a high place. Useful for the construction of large-sized chimneys.

１ 二重筒構造の煙突
２ スパイラル内筒（内筒）
３ 外筒
４ 断熱材
８ 螺旋状のハゼ掛け
９ 補強材 1 Chimney with double cylinder structure 2 Spiral inner cylinder (inner cylinder)
3 Outer cylinder 4 Heat insulation material 8 Spiral goby 9 Reinforcing material

Claims (4)

螺旋状のハゼ掛けを備えるスパイラル内筒と、この内筒を取り囲む外筒との間に断熱材を装填した二重筒構造の煙突において、
前記スパイラル内筒には、前記螺旋状のハゼ掛けにかかる負荷を負担して、ハゼ掛けの分離やハゼ掛け以外の部位の損傷に伴う当該スパイラル内筒の損壊を防止する補強材が備わっていることを特徴とする二重筒構造の煙突。 In the chimney of a double cylinder structure in which a heat insulating material is loaded between a spiral inner cylinder having a spiral goblet and an outer cylinder surrounding the inner cylinder,
The spiral inner cylinder is provided with a reinforcing material that bears a load applied to the spiral goblet and prevents the spiral inner pipe from being damaged due to separation of the goblet and damage to parts other than the goblet. A chimney with a double cylinder structure characterized by that. 請求項１に記載した二重筒構造の煙突において、
前記補強材は、上下方向に延在してスパイラル内筒に備わる少なくとも二つからなる二重筒構造の煙突。 In the chimney of the double cylinder structure according to claim 1,
The reinforcing member is a chimney having at least two double cylinder structures extending in the vertical direction and provided in a spiral inner cylinder. 請求項１または２に記載した二重筒構造の煙突において、
前記螺旋状のハゼ掛けに前記補強材が備わっている二重筒構造の煙突。 In the double-stacked chimney according to claim 1 or 2,
A chimney having a double cylinder structure in which the reinforcing member is provided on the spiral goby hook. 請求項１〜請求項３のいずれか１項に記載した二重筒構造の煙突において、
前記補強材を含む前記スパイラル内筒は、遮蔽シートによって取り巻かれている二重筒構造の煙突。 In the chimney of a double cylinder structure given in any 1 paragraph of Claims 1-3,
The spiral inner cylinder including the reinforcing member is a chimney having a double cylinder structure surrounded by a shielding sheet.
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JP2019105388A (en) * 2017-12-11 2019-06-27 コーキ株式会社 chimney
JP2020003105A (en) * 2018-06-26 2020-01-09 フジモリ産業株式会社 Chimney and lining member of the same

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CN110005846B (en) * 2019-04-09 2024-04-30 北京石油化工工程有限公司 Water sealed tank
CN112179152A (en) * 2019-09-03 2021-01-05 相庆柱 Spiral centrifugal chimney

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JPS5169930U (en) * 1975-11-20 1976-06-02
JPS60216115A (en) * 1984-04-11 1985-10-29 Nippon Kokan Kk <Nkk> Double stack
JPH037704Y2 (en) * 1986-09-03 1991-02-26
JP3821071B2 (en) * 2002-08-20 2006-09-13 株式会社高木工業所 Chimney connection structure

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019105388A (en) * 2017-12-11 2019-06-27 コーキ株式会社 chimney
JP2020003105A (en) * 2018-06-26 2020-01-09 フジモリ産業株式会社 Chimney and lining member of the same
JP7049194B2 (en) 2018-06-26 2022-04-06 フジモリ産業株式会社 Chimney and its lining member

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