JP4119792B2 - Tunnel fireproof coating structure - Google Patents

Description

【０００１】
【発明の属する技術分野】
本発明は、シールドトンネル、沈埋トンネル、開削トンネル等のトンネルの内周面を火災の熱から守るためのトンネル耐火被覆構造に関する。
【０００２】
【従来の技術】
従来のトンネル構造においては、コンクリート又はセグメントによる一次覆工体の内側にトンネル構造を火災による熱から守るための耐火二次覆工がなされる。
耐火二次覆工としては、コンクリート吹き付け工法や発泡バーミキュライトを混入したコンクリート吹き付け工法が実施されてきた。
また、特開２００３−１３８８８９号公報、特開２００３−１３８８９０号公報、特開２００３−１３８８９１号公報には、断熱材上に断面波形の金属パネルを積層した耐火被覆材を隣り合う耐火被覆材が重なるように配置し、耐火被覆材の目地部を一次覆工に固定したアンカーボルトと長孔を形成した支持金具により固定するトンネルの耐火被覆構造が開示されている。
【０００３】
【特許文献１】
特開２００３−１３８８８９号公報
【特許文献２】
特開２００３−１３８８９０号公報
【特許文献１】
特開２００３−１３８８９１号公報
【０００４】
【発明が解決しようとする課題】
従来のコンクリート吹き付け又は発泡バーミキュライト混入のコンクリート吹き付けにより耐火被覆構造では、火災外力が作用した場合、被災面をハツリして除去し、再度コンクリート吹き付け又は発泡バーミキュライト混入のコンクリート吹き付けをする必要があり、復旧に多くの時間を要するという問題を有するものであった。
また、特開２００３−１３８８８９号公報に開示された耐火被覆構造においては、隣り合う耐火被覆部材が重なり合うような目地部であるため、火災外力が作用し損傷した耐火被覆部材を新しい耐火被覆部材に交換する際、損傷した耐火被覆部材だけでなく隣り合う損傷を受けていない耐火被覆部材もトンネルの一次覆工体から取り外さなければならず、復旧作業に時間を要するという問題を有するものであった。
【０００５】
本発明は、従来のトンネルの耐火被覆構造の持つ課題を解決した、耐火被覆部材の一次覆工体への取り付け、取り外しが容易であり、火災時の金属パネルの熱膨張を吸収可能であり、外観上もすぐれたトンネルの耐火被覆構造を提供することを目的とする。
【０００６】
【課題を解決するための手段】
本第１発明は、前記課題を解決するために、トンネルの耐火被覆構造において、トンネルの一次覆工体の内側に用いる耐火被覆構造であって、少なくとも２個の接合ピンが設けられた継手板と、金属パネルの背面側にパネル部断熱材が接合され、隣り合うパネル部断熱材間に目地部が設けられ、隣り合う金属パネル同士が該目地部を覆うことなく離間している耐火被覆部材と、周方向及び軸方向支持金具とからなり、多数の前記継手板がトンネルの一次覆工体に所定の間隔をおいてアンカーボルトで固定され、前記耐火被覆部材が、隣り合うパネル部断熱材間に密接する目地部を構成し、該トンネル周方向に複数配置された耐火被覆部材間の目地部を覆って金属パネルの端部上に重なる軸方向支持金具及びトンネル軸方向に複数配置された耐火被覆部材間の目地部を覆って金属パネルの端部上に重なる周方向支持金具により、前記接合ピンを介して継手板に固定されていることを特徴とする。
【０００７】
本第２発明は、本第１発明のトンネルの耐火被覆構造において、前記継手板に設けられる接合ピンの一部を火災の際の金属パネルの熱膨張を吸収するため摺動可能な摺動接合ピンとすることを特徴とする。
【０００８】
本第３発明は、本第１又は第２発明のトンネルの耐火被覆構造において、前記耐火被覆部材を接合する軸方向支持金具が、固定接合ピンが設けられた継手板と軸方向に摺動可能な摺動接合ピンを設けられた継手板とに交互に接合されることを特徴とする。
【０００９】
本第４発明は、本第１〜第３の発明のいずれか１つの発明のトンネルの耐火被覆構造において、前記継手板に継手板の大きさより大きい継手板上断熱材を取り付け、前記耐火被覆部材の前記継手板と対応する部分のパネル部断熱材を切り欠くことを特徴とする。
【００１０】
本第５発明は、本第１〜第３発明のいずれか１つの発明のトンネルの耐火被覆構造において、前記金属パネルが断面波形であり、トンネル軸方向又は周方向の目地部に配置される支持金具の少なくとも一方が断面波形であり、支持金具の波の谷部で前記接合ピンを介して継手板に固定されることを特徴とする。
【００１1】
本第6発明は、本第１〜第５発明のいずれか１つの発明のトンネルの耐火被覆構造において、前記金属パネルが平板状であり、目地部に配置される支持金具が中央部に下向きの凹部を有するハット形であり、支持金具の中央凹部で前記接合ピンを介して継手板に固定されることを特徴とする。
【００１２】
【発明の実施の形態】
本発明の実施の形態を図により説明する。図１（ａ）（ｂ）は本発明の実施形態を示す断面図と側面図である。地山１にトンネルの一次覆工体２が形成される。一次覆工体２は、鉄筋コンクリート、コンクリートセグメント、鋼−コンクリート合成セグメント等により構築される。トンネルの断面は図１において円形のものを示しているが、断面矩形や断面アーチであってもよい。トンネルの一次覆工体２の天井側に天井側耐火被覆部材３、側壁側に側壁側耐火被覆部材４が設置される。
【００１３】
図２は、天井側耐火被覆部材３の斜視図である。天井側耐火被覆部材３は、矩形のパネル部断熱材５の上に断面波形の金属パネル６が積層され一体化されたものである。断熱材の具体例としては、セラミックファイバー、グラスファイバー等である。矩形のパネル部断熱材５の継手板７に対応するコーナー部や中間部に切欠き部８を形成する。断面波形の金属パネル６は、パネル部断熱材５の周囲の目地部が露出する大きさとする。
【００１４】
図３（ａ）（ｂ）は、天井側耐火被覆部材３のトンネルの一次覆工体２に取り付けた状態の断面図と平面図である。天井側耐火被覆部材３は、周囲の断熱材５が露出した目地部で、トンネルの一次覆工体２に固定された継手板７とトンネルの軸方向支持金具９、トンネルの周方向支持金具１０とをボルトで固定することにより露出した目地部を覆い断面波形金属パネル６の端部上に軸方向支持金具９と周方向支持金具の端部が重なるようにして設置される。図に示される実施形態では、軸方向支持金具９は断面ハット形で、周方向支持金具１０は断面波形としている。
【００１５】
図４（ａ）（ｂ）（ｃ）は、天井側耐火被覆部材３の継手板７の種類の一例を示す平面図であり、図４（ａ）は、図３（ｂ）の軸方向支持金具９を接合する軸方向に摺動する一対の摺動接合ピン１５を設けた継手板７ａを示し、図４（ｂ）は、図３（ｂ）の軸方向支持金具９を接合する固定接合ピン１８を一対軸方向に設けた継手板７ｂを示し、前記軸方向に摺動する摺動接合ピン１５を設けた継手板７ａと、固定接合ピン１８を設けた継手板７ｂとが交互に配置される。図４（ｃ）は、図３（ｂ）の周方向支持金具１０の中間部を接合する固定接合ピン１８を軸方向、周方向にそれぞれ一対設けた継手板７ｃを示す。
【００１６】
図５（ａ）（ｂ）（ｃ）は、継手板７が一次覆工体２にアンカーボルト１６により固定された状態の平面図、Ｂ−Ｂ線断面図、Ａ−Ａ線断面図である。継手板７は、矩形の金属製ベースプレート１１の中央部にアンカーボルト挿通孔１２が形成される。金属製ベースプレート１１の中央部のアンカーボルト挿通孔１２を挟んで一対の鍵状孔１３が形成される。鍵状孔１３の一端の大径部１３ａには、折り曲げ可能なストッパー１４が設けられる。鍵状孔１３の直線状幅狭部１３ｂには、抜け止めされた摺動接合ピン１５が摺動自在に配置される。摺動接合ピン１５は、図６（ａ）（ｂ）に示されるように、鍵状孔１３の大径部１３ａからその下端部を挿入した後、鍵状孔１３の直線状幅狭部１３ｂに移動させ、ストッパー１４を下向きに折り曲げ、摺動ピン１５が鍵状孔１３の大径部１３ａへの移動が阻止される。摺動接合ピン１５には雌ねじが形成される。継手板７は、アンカーボルト挿通孔１２に挿通するアンカーボルト１６が、トンネルの一次覆工体２に埋め込まれた埋込みナット１７に螺着してトンネルの一次覆工体２に固定される。摺動接合ピン１５が配置された方向と直交する方向に一対の固定接合ピン１８が配置される。固定接合ピン１８には雌ねじが形成される。
【００１７】
図７は、図３（ｂ）のＡ−Ａ線断面図であり、天井側耐火被覆部材３のトンネル周方向支持金具１０の中間部の断面図である。この部分に配置される継手板７ｃは、トンネルの軸方向及び周方向にそれぞれ一対配置された固定接合ピン１８を有する。継手板７ｃの底面には継手板下断熱材５ｂが設置され、継手板上には、周囲の厚さを薄くした継手板７ｃより若干大きい継手板上断熱材５ａが予め設置され、天井側耐火被覆部材３の目地部のパネル部断熱材５は、継手板７ｃ上に設置された継手板上断熱材５ａの周囲薄層部と重なる部分が薄層とされる。トンネル周方向支持金具１０は、断面波形で隣合う天井側耐火被覆部材３の断面波形金属パネル６の端部と重ね合わされる。断面波形のトンネル周方向支持金具１０の谷部で継手板７ｃの固定接合ピン１８がボルト１９により固定される。
【００１８】
図８は、図３（ｂ）のＢ−Ｂ線断面図であり、天井側耐火被覆部材３のトンネル軸方向支持金具９の端部の断面図である。この部分に配置される継手板７ａは、トンネルの軸方向に平行に配置された一対の摺動接合ピン１５を有する。継手板７ｃの底面には継手板下断熱材５ｂが設置され、継手板上には、周囲の厚さを薄くした継手板７ｃより若干大きい継手板上断熱材５ａが予め設置され、天井側耐火被覆部材３の目地部のパネル部断熱材５は、継手板７ｃ上に設置された継手板上断熱材５ａの周囲薄層部と重なる部分が薄層とされる。トンネル軸方向支持金具９は、断面ハット形で隣合う天井側耐火被覆部材３の断面波形金属パネル６の端部と重ね合わされる。断面ハット形のトンネル軸方向支持金具１０の谷部で継手板７ａの摺動接合ピン１５がボルト１９により固定される。
【００１９】
図９は、側壁側耐火被覆部材４の斜視図である。側壁側耐火被覆部材４は、矩形のパネル部断熱材５の上に平板状の金属パネル２０が積層され一体化されたものである。断熱材の具体例としては、セラミックファイバー、グラスファイバー等である。矩形のパネル部断熱材５の継手板７に対応するコーナー部や中間部に切欠き部８を形成する。平板状の金属パネル２０は、断熱材５の周囲の目地部が露出する大きさとする。
【００２０】
図１０（ａ）（ｂ）は、側壁側耐火被覆部材４のトンネルの一次覆工体２に取り付けた状態の断面図と平面図である。側壁側耐火被覆部材４は、周囲のパネル部断熱材５が露出した目地部で、トンネルの一次覆工体２に固定された継手板７と軸方向支持金具９、周方向支持金具１０とをボルトで固定することにより露出した目地部を覆うように設置される。側壁側耐火被覆部材４の最下端部には、トンネル軸方向に延びる底部支持金具２１が固定される。軸方向金具９及び周方向金具１０の両端部には長穴を形成し、中間部には丸穴を形成する。端部の長穴は、耐火被覆部材を継手板７の接合ピンに固定する際の位置合わせを容易とする。
【００２１】
図１１（ａ）（ｂ）（ｃ）は、側壁側耐火被覆部材４の継手板７の種類の一例を示す平面図であり、図１１（ａ）は、図１０（ｂ）の軸方向支持金具９の端部を接合する軸方向に摺動する一対の摺動接合ピン１５とそれと直交する方向に一対の固定接合ピン１８を設けた継手板７ｄを示し、図１１（ｂ）は、図１０（ｂ）の軸方向支持金具９の中間部を接合する固定接合ピン１８を一対軸方向に設けた継手板７ｅを示し、前記軸方向に摺動する摺動接合ピン１５を設けた継手板７ｄと、固定接合ピン１８を設けた継手板７ｅとが交互に配置される。図１１（ｃ）は、図１０（ｂ）の周方向支持金具１０の中間部を接合する固定接合ピン１８を周方向にそれぞれ一対設けた継手板７ｆを示す。
【００２２】
図１２は、図１０（ｂ）のＡ―Ａ線の断面図であり、側壁側耐火被覆部材４の軸方向支持金具９の中間部の断面図である。この部分に配置される継手板７ｅは、トンネルの軸方向に平行に配置された一対の固定接合ピン１８を有する。継手板７ｅの底面には継手板下断熱材５ｂが設置され、継手板７ｅ上には、周囲の厚さを薄くした継手板７ｅより若干大きい継手板上断熱材５ａが予め設置され、側壁側耐火被覆部材４の目地部のパネル部断熱材５は、継手板７ｅ上に設置された継手板上断熱材５ａの周囲薄層部と重なる部分が薄層とされる。側壁側耐火被覆部材４を固定する軸方向支持金具及び周方向支持金具１０は、断面ハット形で隣合う側壁側耐火被覆部材４の平板状の金属パネル２０の端部と重ね合わされる。断面ハット形の軸方向支持金具９及び周方向支持金具１０の谷部で継手板７ｄ、７ｅ、７ｆの接合ピンがボルト１９により固定される。
【００２３】
【発明の効果】
本発明の少なくとも２個の接合ピンが設けられた継手板と、金属パネルの背面側に、該金属パネルの周囲の目地部が露出してパネル部断熱材が接合された耐火被覆部材と、周方向及び軸方向の支持金具とからなり、多数の前記継手板がトンネルの一次覆工体に所定の間隔をおいてアンカーボルトで固定され、前記耐火被覆部材が、隣り合うパネル部断熱材同士を接して目地部を構成し、該目地部を覆って金属パネルの端部上に重なる周方向及び軸方向支持金具により、前記接合ピンを介して継手板に固定するという構成により、隣合う耐火被覆部材が重なり合うことがないので、一次覆工体への耐火被覆部材の取付が容易であり、且つ、火災等により損傷を受けた耐火被覆部材のみを取り外し、新しいものに取り替えることが容易となる。
支持金具と継手板の連結が、摺動接合ピンの摺動と支持金具の端部の長穴により行うので、耐火被覆部材のトンネル一次覆工体への取り付け作業が容易となり、且つ、火災荷重による金属部材の熱膨張が摺動接合ピンの摺動により吸収できる。
継手板上に継手板上断熱材が予め設置され、耐火被覆部材の継手板に対応する部分の断熱材が切欠かれているため、目地部の断熱材の厚さが一定となる。
継手板の摺動接合ピン、固定接合ピンと支持金具の固定が波形又はハット形の凹部で行われるので、ボルト頭部が耐火被覆構造の表面に突出しないので外観上優れている。
【図面の簡単な説明】
【図１】（ａ）（ｂ）は本発明の実施形態を示す断面図と側面図である。
【図２】天井側耐火被覆部材３の斜視図である。
【図３】（ａ）（ｂ）は、天井側耐火被覆部材３のトンネルの一次覆工体２に取り付けた状態の断面図と平面図である。
【図４】（ａ）（ｂ）（ｃ）は、天井側耐火被覆部材を固定するための複数種の継手板の平面図である。
【図５】（ａ）（ｂ）（ｃ）は、継手板の平面図とＢ−Ｂ線図断面図、Ａ‐Ａ線図断面図である。
【図６】（ａ）（ｂ）摺動接合ピンの鍵状孔への設置状況を示す図である。
【図７】 図３（ｂ）のＡ−Ａ線断面図である。
【図８】 図３（ｂ）のＢ−Ｂ線断面図である。
【図９】側壁側耐火被覆部材４の斜視図である。
【図１０】（ａ）（ｂ）は、側壁側耐火被覆部材４のトンネルの一次覆工体２に取り付けた状態の断面図と平面図である。
【図１１】（ａ）（ｂ）（ｃ）は、側壁側耐火被覆部材を固定するための複数種の継手板の平面図である。
【図１２】図１０（ｂ）のＡ―Ａ線の断面図である。
【符号の説明】
１：地山
２：一次覆工体
３：天井側耐火被覆部材
４：側壁側耐火被覆部材
５：パネル部断熱材
５ａ：継手板上断熱材
５ｂ：継手板下断熱材
６：断面波形金属パネル
７：継手板
８：切欠き部
９：軸方向支持金具
１０：周方向支持金具
１１：ベースプレート
１２：アンカーボルト挿通孔
１３：鍵状孔
１３ａ：鍵状孔の大径部
１３ｂ：鍵状孔の直線状幅狭部
１４：ストッパー
１５：摺動接合ピン
１６：アンカーボルト
１７：埋込みナット
１８：固定接合ピン
１９：ボルト
２０：平板状金属パネル
２１：底部支持金具[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tunnel fireproof covering structure for protecting the inner peripheral surface of a tunnel such as a shield tunnel, a submerged tunnel, and an open-cut tunnel from the heat of a fire.
[0002]
[Prior art]
In the conventional tunnel structure, a refractory secondary lining for protecting the tunnel structure from heat due to fire is made inside the primary lining body made of concrete or segments.
As a fireproof secondary lining, a concrete spraying method or a concrete spraying method mixed with foamed vermiculite has been carried out.
Further, in Japanese Patent Laid-Open Nos. 2003-13889, 2003-138890, and 2003-13891, there is a fire-resistant coating material adjacent to a fire-resistant coating material in which a metal panel having a corrugated cross section is laminated on a heat insulating material. There is disclosed a fireproof coating structure for a tunnel that is arranged so as to overlap and is fixed by anchor bolts that fix joints of the fireproof coating material to the primary lining and support brackets that are formed with long holes.
[0003]
[Patent Document 1]
JP 2003-138889 A [Patent Document 2]
JP 2003-138890 A [Patent Document 1]
Japanese Patent Laid-Open No. 2003-138891
[Problems to be solved by the invention]
In the case of fireproof coating structure by conventional concrete spraying or concrete spraying mixed with foamed vermiculite, if a fire external force is applied, it is necessary to scrape and remove the damaged surface, and again spray concrete or foaming vermiculite mixed concrete and restore It has a problem that it takes a lot of time.
Moreover, in the fireproof coating structure disclosed in Japanese Patent Application Laid-Open No. 2003-138889, since the adjacent fireproof coating members are joint portions, the fireproof coating member damaged by the action of a fire external force is used as a new fireproof coating member. When replacing, not only the damaged fireproof covering member but also the adjacent non-damaged fireproof covering member had to be removed from the primary lining body of the tunnel, and there was a problem that it took time for the restoration work .
[0005]
The present invention solves the problems of conventional fireproof coating structures for tunnels, is easy to attach to and remove from the primary lining of fireproof coating members, and can absorb the thermal expansion of metal panels during a fire, An object of the present invention is to provide a fireproof covering structure for a tunnel which is excellent in appearance.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the first invention of the present invention is a fireproof coating structure used inside the primary lining body of a tunnel in a fireproof coating structure of a tunnel, wherein the joint plate is provided with at least two joining pins. A fireproof covering member in which a panel part heat insulating material is joined to the back side of the metal panel, a joint is provided between adjacent panel part heat insulating materials, and the adjacent metal panels are separated from each other without covering the joint When the circumferential direction and consists of a axial support bracket, is secured by anchor bolts at a number of the joint plate at predetermined intervals in the primary lining of the tunnel, the refractory covering member, portions adjacent the panel heat insulator It constitutes a joint portion closely between, in which a plurality of axially arranged support fitting and the tunnel axis to cover the joint portion overlying an end portion of the metal panels between a plurality arranged fire protection member to the tunnel circumferential direction Resistance The circumferential support bracket to cover the joint portion between the cover member overlying the end of the metal panels, characterized in that it is fixed to the joint plate through the bonding pin.
[0007]
The second aspect of the present invention is a refractory covering structure for a tunnel according to the first aspect of the present invention, wherein a part of the joining pins provided on the joint plate is slidable to absorb thermal expansion of the metal panel during a fire. It is characterized by a pin.
[0008]
According to the third aspect of the present invention, in the fireproof covering structure of the tunnel according to the first or second aspect of the invention, the axial support fitting for joining the fireproof covering member is slidable in the axial direction with the joint plate provided with the fixed joining pin. It is characterized by being alternately joined to a joint plate provided with various sliding joining pins.
[0009]
According to a fourth aspect of the present invention, in the fireproof covering structure for a tunnel according to any one of the first to third aspects of the present invention, a heat insulating material on a joint plate larger than a joint plate is attached to the joint plate, and the fireproof covering member is provided. The panel part heat insulating material of the part corresponding to the said joint board is notched, It is characterized by the above-mentioned.
[0010]
According to a fifth aspect of the present invention, in the fireproof coating structure for a tunnel according to any one of the first to third aspects of the invention, the metal panel has a corrugated cross section and is disposed at a joint portion in the tunnel axial direction or the circumferential direction. At least one of the metal fittings has a corrugated cross section, and is fixed to the joint plate via the joining pin at a wave trough of the support metal fitting.
[0101]
According to a sixth aspect of the present invention, in the fireproof coating structure for a tunnel according to any one of the first to fifth aspects of the invention, the metal panel has a flat plate shape, and the support fitting disposed in the joint portion is directed downward at the center portion. It is a hat shape which has a recessed part, and is fixed to a joint plate via the said joining pin in the center recessed part of a support metal fitting, It is characterized by the above-mentioned.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. 1A and 1B are a sectional view and a side view showing an embodiment of the present invention. A primary lining body 2 of the tunnel is formed on the natural ground 1. The primary lining body 2 is constructed of reinforced concrete, a concrete segment, a steel-concrete composite segment, or the like. Although the cross section of the tunnel is circular in FIG. 1, it may be a cross section rectangle or a cross section arch. The ceiling side fireproof covering member 3 is installed on the ceiling side of the primary lining body 2 of the tunnel, and the side wall side fireproof covering member 4 is installed on the side wall side.
[0013]
FIG. 2 is a perspective view of the ceiling-side fireproof covering member 3. The ceiling-side fireproof covering member 3 is formed by laminating and integrating a metal panel 6 having a corrugated cross section on a rectangular panel heat insulating material 5. Specific examples of the heat insulating material include ceramic fiber and glass fiber. Cutout portions 8 are formed at corner portions and intermediate portions corresponding to the joint plates 7 of the rectangular panel portion heat insulating material 5. The metal panel 6 having a corrugated cross section is sized so that the joints around the panel heat insulating material 5 are exposed.
[0014]
FIGS. 3A and 3B are a cross-sectional view and a plan view of the ceiling side fireproof covering member 3 attached to the primary lining body 2 of the tunnel. The ceiling-side fireproof covering member 3 is a joint where the surrounding heat insulating material 5 is exposed, a joint plate 7 fixed to the primary lining body 2 of the tunnel, an axial support bracket 9 of the tunnel, and a circumferential support bracket 10 of the tunnel. Are fixed with bolts so as to cover the exposed joint portions, and the end portions of the axial support metal fitting 9 and the circumferential support metal fittings are placed on the end portions of the corrugated metal panel 6 in a cross section. In the embodiment shown in the figure, the axial support metal fitting 9 has a hat shape in cross section, and the circumferential support metal fitting 10 has a corrugated cross section.
[0015]
4 (a), 4 (b) and 4 (c) are plan views showing an example of the type of joint plate 7 of the ceiling side fireproof covering member 3, and FIG. 4 (a) is an axial support of FIG. 3 (b). FIG. 4B shows a joint plate 7a provided with a pair of sliding joint pins 15 that slide in the axial direction for joining the metal fitting 9, and FIG. 4B shows a fixed joint for joining the axial support metal fitting 9 in FIG. 3B. A joint plate 7b provided with pins 18 in a pair of axial directions is shown, and joint plates 7a provided with sliding joint pins 15 sliding in the axial direction and joint plates 7b provided with fixed joint pins 18 are alternately arranged. Is done. FIG. 4 (c) shows a joint plate 7c provided with a pair of fixed joint pins 18 for joining the intermediate portion of the circumferential support bracket 10 of FIG. 3 (b) in the axial direction and the circumferential direction.
[0016]
5A, 5B, and 5C are a plan view, a BB line sectional view, and an AA line sectional view in a state in which the joint plate 7 is fixed to the primary lining body 2 by the anchor bolt 16. FIG. . The joint plate 7 has an anchor bolt insertion hole 12 formed at the center of a rectangular metal base plate 11. A pair of key-like holes 13 are formed with an anchor bolt insertion hole 12 in the center of the metal base plate 11 interposed therebetween. A bendable stopper 14 is provided at the large-diameter portion 13 a at one end of the key-like hole 13. In the linear narrow portion 13 b of the key-like hole 13, a sliding joint pin 15 that is prevented from coming off is slidably disposed. As shown in FIGS. 6A and 6B, the sliding joining pin 15 is inserted into the lower end portion from the large diameter portion 13 a of the key-shaped hole 13, and then the linear narrow portion 13 b of the key-shaped hole 13. The stopper 14 is bent downward, and the sliding pin 15 is prevented from moving to the large-diameter portion 13a of the key hole 13. An internal thread is formed on the sliding joint pin 15. In the joint plate 7, the anchor bolt 16 inserted into the anchor bolt insertion hole 12 is screwed to the embedded nut 17 embedded in the primary lining body 2 of the tunnel and is fixed to the primary lining body 2 of the tunnel. A pair of fixed joining pins 18 are arranged in a direction orthogonal to the direction in which the sliding joining pins 15 are arranged. An internal thread is formed on the fixed joining pin 18.
[0017]
FIG. 7 is a cross-sectional view taken along the line AA in FIG. The joint plate 7c disposed in this portion has a pair of fixed joint pins 18 disposed in the axial direction and the circumferential direction of the tunnel. A joint plate lower heat insulating material 5b is installed on the bottom surface of the joint plate 7c. On the joint plate, a joint plate heat insulating material 5a slightly larger than the joint plate 7c having a thinner peripheral thickness is installed in advance, and the ceiling side fireproofing As for the panel part heat insulating material 5 of the joint part of the coating | coated member 3, the part which overlaps with the surrounding thin layer part of the heat insulating material 5a on a joint board installed on the joint board 7c is made into a thin layer. The tunnel circumferential direction support metal fitting 10 is overlapped with the end portion of the cross-section corrugated metal panel 6 of the ceiling-side fireproof covering member 3 adjacent in the cross-section corrugation. The fixed joint pin 18 of the joint plate 7 c is fixed by a bolt 19 at the trough portion of the tunnel circumferential support fitting 10 having a corrugated cross section.
[0018]
FIG. 8 is a cross-sectional view taken along the line B-B in FIG. The joint plate 7a disposed in this portion has a pair of sliding joint pins 15 disposed in parallel to the axial direction of the tunnel. A joint plate lower heat insulating material 5b is installed on the bottom surface of the joint plate 7c. On the joint plate, a joint plate heat insulating material 5a slightly larger than the joint plate 7c having a thinner peripheral thickness is installed in advance, and the ceiling side fireproofing As for the panel part heat insulating material 5 of the joint part of the coating | coated member 3, the part which overlaps with the surrounding thin layer part of the heat insulating material 5a on a joint board installed on the joint board 7c is made into a thin layer. The tunnel axial direction support metal fitting 9 is overlapped with the end portion of the cross-sectional corrugated metal panel 6 of the adjacent ceiling-side fireproof covering member 3 having a cross-sectional hat shape. The sliding joint pin 15 of the joint plate 7 a is fixed by a bolt 19 at a valley portion of the tunnel axial direction support fitting 10 having a hat-shaped cross section.
[0019]
FIG. 9 is a perspective view of the side wall-side fireproof covering member 4. The side wall-side fireproof covering member 4 is formed by laminating a flat metal panel 20 on a rectangular panel heat insulating material 5 and integrating them. Specific examples of the heat insulating material include ceramic fiber and glass fiber. Cutout portions 8 are formed at corner portions and intermediate portions corresponding to the joint plates 7 of the rectangular panel portion heat insulating material 5. The flat metal panel 20 has such a size that the joints around the heat insulating material 5 are exposed.
[0020]
10A and 10B are a cross-sectional view and a plan view showing a state where the side wall-side fireproof covering member 4 is attached to the primary lining body 2 of the tunnel. The side wall-side fireproof covering member 4 is a joint portion where the surrounding panel portion heat insulating material 5 is exposed, and includes a joint plate 7 fixed to the primary lining body 2 of the tunnel, an axial support bracket 9 and a circumferential support bracket 10. It is installed so as to cover the exposed joint by fixing with bolts. A bottom support member 21 extending in the tunnel axis direction is fixed to the lowermost end portion of the side wall-side fireproof covering member 4. A long hole is formed at both ends of the axial metal fitting 9 and the circumferential metal fitting 10, and a round hole is formed at the intermediate portion. The long hole at the end facilitates alignment when the fireproof covering member is fixed to the joining pin of the joint plate 7.
[0021]
11 (a), 11 (b) and 11 (c) are plan views showing an example of the type of joint plate 7 of the side wall-side fireproof covering member 4, and FIG. 11 (a) is an axial support of FIG. 10 (b). FIG. 11B shows a joint plate 7d provided with a pair of sliding joint pins 15 that slide in the axial direction for joining the end portions of the metal fitting 9 and a pair of fixed joint pins 18 in a direction orthogonal thereto. 10 (b) shows a joint plate 7e provided with a pair of fixed joint pins 18 for joining an intermediate portion of the axial support fitting 9 in the axial direction, and a joint plate provided with a sliding joint pin 15 that slides in the axial direction. 7d and the joint plate 7e provided with the fixed joining pin 18 are alternately arranged. FIG. 11C shows a joint plate 7f provided with a pair of fixed joint pins 18 for joining the intermediate portion of the circumferential support bracket 10 of FIG. 10B in the circumferential direction.
[0022]
FIG. 12 is a cross-sectional view taken along the line AA in FIG. The joint plate 7e disposed in this portion has a pair of fixed joint pins 18 disposed in parallel with the axial direction of the tunnel. A joint plate lower heat insulating material 5b is installed on the bottom surface of the joint plate 7e. On the joint plate 7e, a joint plate heat insulating material 5a slightly larger than the joint plate 7e having a thinner peripheral thickness is installed in advance. As for the panel part heat insulating material 5 of the joint part of the fireproof covering member 4, the part which overlaps with the surrounding thin layer part of the heat insulating material 5a on a joint board installed on the joint board 7e is made into a thin layer. The axial direction supporting metal fitting and the circumferential direction supporting metal fitting 10 for fixing the side wall side fireproof covering member 4 are overlapped with the end portion of the flat metal panel 20 of the adjacent side wall side fireproof covering member 4 in a hat shape. The joint pins of the joint plates 7 d, 7 e, 7 f are fixed by bolts 19 at the troughs of the axial support fitting 9 and the circumferential support fitting 10 having a hat-shaped cross section.
[0023]
【The invention's effect】
A joint plate provided with at least two joining pins of the present invention, a fireproof covering member in which a joint portion around the metal panel is exposed on the back side of the metal panel and a panel part heat insulating material is joined; A large number of the joint plates are fixed to the primary lining body of the tunnel with anchor bolts at a predetermined interval, and the fireproof covering member connects the adjacent panel part heat insulating materials to each other. Adjacent refractory coating with a configuration in which a joint portion is formed by contact, and the joint portion is fixed to the joint plate via the joining pin by a circumferential and axial support metal fitting that covers the joint portion and overlaps the end portion of the metal panel. since no member overlap, it is easy to mount the fire protection member to the primary lining body, and removed only refractory covering member is damaged due to fire, etc., it can be easily replaced with one new Become.
Since the connection between the support bracket and the joint plate is performed by sliding the sliding joint pin and the long hole at the end of the support bracket, it is easy to attach the fireproof covering member to the tunnel primary lining body, and the fire load The thermal expansion of the metal member due to can be absorbed by the sliding of the sliding joint pin.
Since the heat insulating material on the joint plate is preliminarily installed on the joint plate, and the portion of the heat insulating material corresponding to the joint plate of the fireproof covering member is cut away, the thickness of the heat insulating material at the joint is constant.
Since the sliding joint pin of the joint plate, the fixed joint pin and the support fitting are fixed by the corrugated or hat-shaped recess, the bolt head does not protrude from the surface of the fireproof coating structure, which is excellent in appearance.
[Brief description of the drawings]
FIGS. 1A and 1B are a cross-sectional view and a side view showing an embodiment of the present invention.
FIG. 2 is a perspective view of a ceiling-side fireproof covering member 3. FIG.
FIGS. 3A and 3B are a cross-sectional view and a plan view showing a state where the ceiling side fireproof covering member 3 is attached to the primary lining body 2 of the tunnel.
4A, 4B, and 4C are plan views of a plurality of types of joint plates for fixing a ceiling-side fireproof covering member.
[5] (a) (b) (c ) are a plan view and a line B-B view section of a joint plate, an A-A line Figure sectional view.
FIGS. 6A and 6B are views showing the installation state of the sliding joint pins in the key holes. FIGS.
FIG. 7 is a cross-sectional view taken along line AA in FIG.
FIG. 8 is a cross-sectional view taken along line BB in FIG.
9 is a perspective view of a side wall-side fireproof covering member 4. FIG.
FIGS. 10A and 10B are a cross-sectional view and a plan view showing a state where the side wall-side fireproof covering member 4 is attached to the primary lining body 2 of the tunnel.
11A, 11B, and 11C are plan views of a plurality of types of joint plates for fixing the side-wall-side fireproof covering member.
12 is a cross-sectional view taken along line AA in FIG.
[Explanation of symbols]
1: Natural mountain 2: Primary lining body 3: Ceiling side fireproof covering member 4: Side wall side fireproof covering member 5: Panel part heat insulating material 5a: Heat insulating material on joint plate 5b: Heat insulating material under joint plate 6: Corrugated metal panel in cross section 7: Joint plate 8: Notch portion 9: Axial support bracket 10: Circumferential support bracket 11: Base plate 12: Anchor bolt insertion hole 13: Key hole 13a: Large diameter portion of the key hole 13b: Key hole Linear narrow portion 14: Stopper 15: Sliding joint pin 16: Anchor bolt 17: Embedded nut 18: Fixed joint pin 19: Bolt 20: Flat metal panel 21: Bottom support bracket

Claims (6)

トンネルの一次覆工体の内側に用いる耐火被覆構造であって、
少なくとも２個の接合ピンが設けられた継手板と、金属パネルの背面側にパネル部断熱材が接合され、隣り合うパネル部断熱材間に目地部が設けられ、隣り合う金属パネル同士が該目地部を覆うことなく離間している耐火被覆部材と、周方向及び軸方向支持金具とからなり、
多数の前記継手板がトンネルの一次覆工体に所定の間隔をおいてアンカーボルトで固定され、
前記耐火被覆部材が、隣り合うパネル部断熱材間に密接する目地部を構成し、該トンネル周方向に複数配置された耐火被覆部材間の目地部を覆って金属パネルの端部上に重なる軸方向支持金具及びトンネル軸方向に複数配置された耐火被覆部材間の目地部を覆って金属パネルの端部上に重なる周方向支持金具により、前記接合ピンを介して継手板に固定されていることを特徴とするトンネルの耐火被覆構造。A fireproof covering structure used inside the primary lining body of the tunnel,
The joint plate provided with at least two joining pins and the panel part heat insulating material are joined to the back side of the metal panel, a joint part is provided between the adjacent panel part heat insulating materials, and the adjacent metal panels are connected to each other. Consisting of fireproof covering members that are spaced apart without covering the part, and circumferential and axial support brackets ,
A large number of the joint plates are fixed to the primary lining body of the tunnel at predetermined intervals with anchor bolts,
The fireproof covering member constitutes a joint portion in close contact between adjacent panel portion heat insulating materials , and covers the joint portions between the plurality of fireproof covering members arranged in the circumferential direction of the tunnel and overlaps the end portion of the metal panel. It is fixed to the joint plate via the joint pin by a circumferential support bracket that covers the joints between the directional support brackets and the fireproof coating members arranged in the tunnel axial direction and overlaps the end portions of the metal panel. A fireproof covering structure for tunnels. 前記継手板に設けられる接合ピンの一部を火災の際の金属パネルの熱膨張を吸収するため摺動可能な摺動接合ピンとすることを特徴とする請求項１に記載のトンネルの耐火被覆構造。  2. The fireproof covering structure for a tunnel according to claim 1, wherein a part of the joining pin provided on the joint plate is a sliding joining pin that is slidable to absorb thermal expansion of the metal panel during a fire. . 前記耐火被覆部材を接合する軸方向支持金具が、固定接合ピンが設けられた継手板と軸方向に摺動可能な摺動接合ピンを設けられた継手板とに交互に接合されることを特徴とする請求項１又は２に記載のトンネルの耐火被覆構造。  The axial support fitting for joining the fireproof covering member is alternately joined to a joint plate provided with a fixed joint pin and a joint plate provided with a sliding joint pin slidable in the axial direction. The fireproof covering structure for a tunnel according to claim 1 or 2. 前記継手板に継手板の大きさより大きい継手板上断熱材を取り付け、前記耐火被覆部材の前記継手板と対応する部分のパネル部断熱材を切り欠くことを特徴とする請求項１〜３のいずれか１項に記載のトンネルの耐火被覆構造。  4. The joint plate according to claim 1, wherein a heat insulating material on the joint plate larger than a size of the joint plate is attached to the joint plate, and a portion of the panel portion heat insulating material corresponding to the joint plate of the fireproof covering member is cut out. 2. A fireproof covering structure for a tunnel according to item 1. 前記金属パネルが断面波形であり、トンネル軸方向又は周方向の目地部に配置される支持金具の少なくとも一方が断面波形であり、支持金具の波の谷部で前記接合ピンを介して継手板に固定されることを特徴とする請求項１〜４のいずれか１項に記載のトンネルの耐火被覆構造。  The metal panel has a corrugated cross section, and at least one of the support fittings arranged at the joints in the tunnel axis direction or the circumferential direction is a cross section corrugation, and is attached to the joint plate via the joining pin at the wave trough of the support fitting. The fireproof covering structure for a tunnel according to any one of claims 1 to 4, which is fixed. 前記金属パネルが平板状であり、目地部に配置される支持金具が中央部に下向きの凹部を有するハット形であり、支持金具の中央凹部で前記接合ピンを介して継手板に固定されることを特徴とする請求項１〜５のいずれか１項に記載のトンネルの耐火被覆構造。  The metal panel has a flat plate shape, and the support fitting disposed on the joint portion has a hat shape having a downward concave portion in the central portion, and is fixed to the joint plate via the joining pin at the central concave portion of the support fitting. The fireproof covering structure for a tunnel according to any one of claims 1 to 5.