JP4688219B2 - How to spray fireproof material on the inner surface of tunnel lining - Google Patents

How to spray fireproof material on the inner surface of tunnel lining Download PDF

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JP4688219B2
JP4688219B2 JP2006196610A JP2006196610A JP4688219B2 JP 4688219 B2 JP4688219 B2 JP 4688219B2 JP 2006196610 A JP2006196610 A JP 2006196610A JP 2006196610 A JP2006196610 A JP 2006196610A JP 4688219 B2 JP4688219 B2 JP 4688219B2
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cover plate
reinforcing core
segment
tunnel
tunnel lining
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JP2008025143A (en
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一郎 岩谷
諭 丸山
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A&A Material Corp
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Description

本発明は、例えば道路トンネルや鉄道トンネル等のトンネル覆工内面への耐火材吹き付け施工方法に関する。更に詳しくは、掘削したトンネル内面にダクタイルセグメントや鋼製セグメント（スチールセグメント）等の覆工用セグメントを付設して形成したトンネル覆工内面への耐火材吹き付け施工方法に関するものである。   The present invention relates to a method for spraying a refractory material onto the inner surface of a tunnel lining such as a road tunnel or a railway tunnel. More specifically, the present invention relates to a method for spraying a refractory material onto the inner surface of a tunnel lining formed by attaching a lining segment such as a ductile segment or a steel segment (steel segment) to the inner surface of an excavated tunnel.

従来、例えば道路トンネルや鉄道トンネル等において、掘削したトンネル内面にダクタイルセグメントや鋼製セグメント等のトンネル覆工用セグメントを、トンネル軸方向および周方向に並べて付設することによってトンネル覆工を施し、そのトンネル覆工内面に耐火材を吹き付け施工するようにしたものは知られている（例えば下記特許文献１参照）。   Conventionally, for example, in road tunnels and railway tunnels, tunnel lining is provided by arranging tunnel lining segments such as ductile segments and steel segments in the tunnel axial direction and circumferential direction on the inner surface of the excavated tunnel. A construction in which a refractory material is sprayed onto the inner surface of a tunnel lining is known (see, for example, Patent Document 1 below).

ところが、上記のような覆工用セグメントには、隣り合うセグメント同士をボルト・ナット等の連結具で接続するための凹部や、トンネル内の換気用凹部等の比較的開口面積の大きい凹部が設けられるのが一般的であり、そのような凹部を有するトンネル覆工内面に耐火材を吹き付け施工するには、上記凹部を何らかの手段で塞ぐ必要がある。   However, the lining segment as described above is provided with a recess having a relatively large opening area, such as a recess for connecting adjacent segments with a coupling tool such as a bolt and a nut, and a ventilation recess in the tunnel. In order to spray and apply a refractory material to the inner surface of a tunnel lining having such a recess, it is necessary to close the recess by some means.

また上記のようなトンネル覆工内面に耐火材を吹き付け施工する場合には、通常上記覆工内面に予めラス網等の補強芯材を敷設し、その補強芯材を埋設するようにして耐火材をトンネル覆工内面に吹き付け施工するもので、その場合、上記の補強芯材も何らかの手段で上記の凹部を塞ぐ部材等に取付け支持させなければならない。   In addition, when a fireproof material is sprayed on the inner surface of the tunnel lining as described above, a refractory material such as a lath net is usually laid in advance on the inner surface of the lining and the reinforcing core material is buried. Is applied to the inner surface of the tunnel lining, and in this case, the reinforcing core member must be attached and supported on a member that closes the concave portion by some means.

そこで、上記特許文献１においては、上記のような凹部を塞ぐセメント板等のカバー板を取付金具を介して取付け、その取付金具の上記カバー板から突出した端部に補強芯材を取付け支持させるようにしているが、その取付金具の配置位置が限られ、しかも取付箇所が少ないので、上記補強芯材の取付強度が必ずしも充分ではなく、その結果、上記補強芯材を埋設するようにして吹き付け施工される耐火材を安定性よく且つ強固に施工することができない等の問題があった。   Therefore, in Patent Document 1, a cover plate such as a cement plate that closes the concave portion as described above is attached via a mounting bracket, and a reinforcing core member is mounted and supported on an end portion protruding from the cover plate of the mounting bracket. However, since the mounting position of the mounting bracket is limited and the number of mounting locations is small, the mounting strength of the reinforcing core material is not always sufficient, and as a result, the reinforcing core material is buried so as to be buried. There was a problem that the fireproof material to be constructed could not be constructed stably and firmly.

特開２００５−９８０９２号公報JP 2005-98092 A

本発明は上記の問題点に鑑みて提案されたもので、トンネル覆工用セグメントに形成された凹部をカバー板で閉塞し、そのカバー板を含むトンネル覆工内面に補強芯材を敷設すると共に、その補強芯材を埋設するようして吹き付け施工される耐火材にあっても安定性よく且つ強固に施工することのできるトンネル覆工内面への耐火材吹き付け施工方法を提供することを目的とする。   The present invention has been proposed in view of the above-described problems. The concave portion formed in the tunnel lining segment is closed with a cover plate, and a reinforcing core material is laid on the inner surface of the tunnel lining including the cover plate. An object of the present invention is to provide a method for spraying refractory material onto the inner surface of a tunnel lining that can be stably and firmly constructed even in a refractory material that is sprayed and constructed so as to embed its reinforcing core material. To do.

上記の目的を達成するために本発明によるトンネル覆工内面への耐火材吹き付け施工方法は以下の構成としたものである。すなわち、掘削したトンネル内面に覆工用セグメントを付設して形成してなるトンネル覆工内面に耐火材を吹き付け施工するに当たり、上記覆工用セグメントの内面に形成されている凹部を、補強芯材取付用の貫通小孔を所定の間隔をおいて複数設けた不燃性のカバー板で閉塞し、次いで上記カバー板の表面を含むトンネル覆工内面にラス網等の補強芯材を配設して該補強芯材を上記複数個の貫通小孔のいずれかに選択的に固着具を介して取付け支持し、次いで上記カバー板の表面を含むトンネル覆工内面に上記補強芯材を埋め込むようにして耐火材を吹き付け施工することを特徴とする。   In order to achieve the above object, the method for spraying a refractory material onto the inner surface of a tunnel lining according to the present invention has the following configuration. That is, when the refractory material is sprayed on the inner surface of the tunnel lining formed by attaching the lining segment to the inner surface of the excavated tunnel, the concave portion formed on the inner surface of the lining segment is used as the reinforcing core material. A plurality of through-holes for mounting are closed with a non-combustible cover plate provided at a predetermined interval, and then a reinforcing core material such as a lath net is disposed on the tunnel lining inner surface including the surface of the cover plate. The reinforcing core material is selectively attached to and supported by any of the plurality of through-holes via a fixing tool, and then the reinforcing core material is embedded in the tunnel lining inner surface including the surface of the cover plate. It is characterized by spraying fireproof materials.

上記のように補強芯材取付用の貫通小孔を所定の間隔をおいて複数設けたカバー板でセグメントの接続用凹溝等の凹部を閉塞することによって該カバー板の貫通小孔を選択的に利用して、そのカバー板の表面を含むトンネル覆工内面に、ラス網等の補強芯材を所定のピッチで安定性よく取付け支持させることが可能となる。それによって、上記補強芯材を埋設するようにして耐火材を、上記カバー板の表面を含むトンネル覆工内面に良好に吹き付け施工できると共に、施工後は上記補強芯材によって耐火材を安定性よく且つ強固に補強および支持させることができる。また上記カバー板の貫通小孔は例えば工場等で予め形成してから現場に持ち込むことができるので、現場での孔開け加工や、そのための墨出し等が不要となり、容易・安価に施工できる。またカバー板は不燃性であることが望ましく、特に高じん性の不燃性ボードを用いると、トンネル覆工内面の曲面に沿って、セグメントの凹部の閉塞を好適に行うことができる。   As described above, the cover plate provided with a plurality of through-holes for attaching the reinforcing core member at predetermined intervals is used to selectively close the through-holes of the cover plate by closing the recesses such as the connecting groove of the segment. Therefore, it is possible to stably attach and support a reinforcing core material such as a lath net at a predetermined pitch on the inner surface of the tunnel lining including the surface of the cover plate. As a result, the refractory material can be well sprayed on the tunnel lining inner surface including the surface of the cover plate so as to embed the reinforcing core material, and after the construction, the refractory material can be stably applied by the reinforcing core material. In addition, it can be reinforced and supported firmly. Further, since the through-holes of the cover plate can be formed in advance at a factory or the like and then brought into the site, it is not necessary to perform on-site hole drilling, ink marking for that purpose, and the construction can be performed easily and inexpensively. Moreover, it is desirable that the cover plate is non-combustible, and particularly when a highly tough non-combustible board is used, the concave portions of the segments can be suitably closed along the curved surface of the tunnel lining inner surface.

なお、上記の固着具としては、例えばハンガーボルトのようにカバー板の表面側から貫通小孔に抜け止め係止可能な固着具を用いるとよく、そのハンガーボルトを上記複数個の貫通小孔のいずれかに選択的に抜け止め係止すると共に、そのハンガーボルトに蝶ナット等をねじ込んで上記補強芯材を上記カバー板に取付ければ、工具等を用いることなく簡単・確実に取付け支持させることができる。   In addition, as said fixing tool, it is good to use the fixing tool which can carry out retaining locking to the penetration small hole from the surface side of a cover board like a hanger bolt, for example, and the hanger bolt is used for the said several through small holes. If it is selectively locked to either one, and a wing nut or the like is screwed into the hanger bolt and the reinforcing core is attached to the cover plate, it can be easily and securely attached and supported without using tools, etc. Can do.

以下、本発明によるトンネル覆工内面への耐火材吹き付け施工方法を図に示す実施形態に基づいて具体的に説明する。図１（ａ）は本発明による耐火材吹き付け施工方法を適用したトンネル覆工内面の横断平面図、同図（ｂ）はその内面図、同図（ｃ）は（ｂ）におけるｃ−ｃ断面図、図２（ａ）および（ｂ）はそれぞれ図１（ａ）および（ｂ）の一部の拡大図、図３は耐火材を吹き付け施工した状態のトンネル覆工内面の一部の拡大横断平面図である。   Hereinafter, the fireproof material spraying construction method to the tunnel lining inner surface by this invention is demonstrated concretely based on embodiment shown in a figure. FIG. 1 (a) is a cross-sectional plan view of the inner surface of a tunnel lining applied with the refractory material spraying method according to the present invention, FIG. 1 (b) is an inner surface view thereof, and FIG. 1 (c) is a cc cross section in FIG. FIGS. 2A and 2B are enlarged views of a part of FIGS. 1A and 1B, respectively. FIG. 3 is an enlarged cross-sectional view of a part of the inner surface of the tunnel lining in a state where refractory material is sprayed. It is a top view.

本実施形態は、掘削したトンネルＴの内面にトンネル覆工用セグメント１としてダクタイルセグメントをトンネル軸方向（図１（ａ）で左右方向）およびトンネル周方向（図１（ｂ）および（ｃ）で上下方向）に並べて形成したトンネル覆工内面に適用したもので、上記各セグメント１は鋼板部分１ａとコンクリート部分１ｂとで構成され、各セグメント１の軸方向両端部にはセグメント接続用の凹部１０が周方向に複数個設けられている。そして上記軸方向に隣り合うセグメント１・１の各凹部１０の外側面１０ａを互いに突き合わせてボルト２１・ナット２２等の連結具２で接続した構成である。なお上記セグメント１は周方向にも複数個に分割され、その周方向に隣り合うセグメント同士もボルト・ナット等の連結具で接続されているが図には省略した。   In the present embodiment, a ductile segment as a tunnel lining segment 1 is placed on the inner surface of an excavated tunnel T in the tunnel axial direction (left-right direction in FIG. 1 (a)) and the tunnel circumferential direction (FIGS. 1 (b) and (c)). The segment 1 is composed of a steel plate portion 1a and a concrete portion 1b, and a recess 10 for connecting a segment is provided at both axial ends of each segment 1. Are provided in the circumferential direction. And the outer side surface 10a of each recessed part 10 of the segment 1 * 1 adjacent to the said axial direction is faced | matched mutually, and it is the structure connected with the coupling tools 2, such as the volt | bolt 21 and the nut 22. FIG. The segment 1 is also divided into a plurality of pieces in the circumferential direction, and the segments adjacent in the circumferential direction are also connected by a coupling tool such as a bolt and a nut, but are not shown in the figure.

上記各セグメント１の各凹部１０は、その開口部に取付けた不燃性ボード等のカバー板３で閉塞され、そのカバー板３の取付手段は適宜であるが、本実施形態においては図３に示すように断面略Ｌ字形の一対の取付金具３０等を介して取付けられている。その各取付金具３０の一端は、セグメント１の鋼板部分１ａに打設または溶接等で固着したスタッドボルト３１と、そのスタッドボルト３１にねじ込んだナット３２とでセグメント１に取付けられ、他端は通常のボルト３３とナット（図の場合はクリップを一体的に設けたクリップナット）３４とでカバー板３の端部に取付けられている。   Each recess 10 of each segment 1 is closed by a cover plate 3 such as a non-combustible board attached to the opening, and the means for attaching the cover plate 3 is appropriate, but in this embodiment, it is shown in FIG. Thus, it is attached via a pair of mounting brackets 30 and the like having a substantially L-shaped cross section. One end of each of the mounting brackets 30 is attached to the segment 1 by a stud bolt 31 fixed to the steel plate portion 1a of the segment 1 by casting or welding and a nut 32 screwed into the stud bolt 31. Are attached to the end of the cover plate 3 by a bolt 33 and a nut 34 (in the figure, a clip nut integrally provided with a clip).

上記カバー板３の内面を含むトンネル覆工内面、すなわち上記セグメント１の内面には、図３に示すように耐火材５を吹き付け施工し、その耐火材５内にはラス網等の補強芯材４を埋設するもので、上記カバー板３には補強芯材４を取付けるための貫通小孔３ａが所定の間隔をおいて多数設けられている。その貫通小孔３ａの配置位置は適宜であるが、図の場合は前記一対の取付金具３０を上記カバー板３に取付けるための前記ボルト３３・３３間に上記貫通小孔３ａを、それぞれ３つずつほぼ等間隔に設けた構成である。   As shown in FIG. 3, a refractory material 5 is sprayed on the inner surface of the tunnel lining including the inner surface of the cover plate 3, that is, the inner surface of the segment 1, and a reinforcing core material such as a lath net is applied in the refractory material 5. The cover plate 3 is provided with a large number of through-holes 3a for attaching the reinforcing core material 4 at predetermined intervals. The arrangement positions of the through small holes 3a are appropriate, but in the case of the figure, there are three through small holes 3a between the bolts 33 and 33 for attaching the pair of mounting brackets 30 to the cover plate 3, respectively. It is the structure which provided at substantially equal intervals.

上記の構成において、トンネル覆工内面に耐火材を吹き付け施工するに当たっては、掘削したトンネルの内面に順にセグメント１を付設し、隣り合うセグメントをボルト２１・ナット２２等の連結具２で連結して行く。それと同時に、或いは上記セグメントの連結作業が所定長もしくはトンネル全長にわたって終了したところで、セグメント１の凹部１０をカバー板３で順次閉塞して行く。その場合、上記カバー板３には予め工場等で前記の貫通小孔３ａを所定の位置に所定の間隔をおいて複数形成しておくと、現場での孔開け作業やそのための墨出し作業等が不要となる。   In the above configuration, when refractory material is sprayed onto the inner surface of the tunnel lining, the segments 1 are sequentially attached to the inner surface of the excavated tunnel, and the adjacent segments are connected by the connector 2 such as the bolt 21 and the nut 22. go. At the same time or when the connecting operation of the segments is completed over a predetermined length or the entire length of the tunnel, the concave portions 10 of the segments 1 are sequentially closed with the cover plate 3. In that case, if a plurality of the through-holes 3a are formed at predetermined positions at predetermined intervals in the cover plate 3 in advance at a factory or the like, an on-site drilling operation, an inking operation for the purpose, etc. Is no longer necessary.

そして、上記セグメント１の凹部１０がカバー板３で閉塞されたところで、そのカバー板３の内面を含むセグメント１の内面にラス網等の補強芯材４を順次敷設して行き、その補強芯材４に所要箇所をボルト・ナット等の固着具で上記カバー板３の貫通小孔３ａおよび必要に応じてセグメント１の内面に取付け支持させる。図の場合は１つのセグメント１に対して、トンネル軸方向のほぼ中央部でセグメント１に直接取付ると共に、その両側のカバー板３の各々１箇所で貫通小孔３ａに固着具で取付けた構成である。   Then, when the concave portion 10 of the segment 1 is closed by the cover plate 3, a reinforcing core material 4 such as a lath net is sequentially laid on the inner surface of the segment 1 including the inner surface of the cover plate 3, and the reinforcing core material. 4, a required portion is attached to and supported by the through hole 3 a of the cover plate 3 and, if necessary, the inner surface of the segment 1 with a fastener such as a bolt or nut. In the case of the figure, a structure in which a single segment 1 is directly attached to the segment 1 at a substantially central portion in the tunnel axis direction, and is attached to the through hole 3a with a fixing tool at each one of the cover plates 3 on both sides thereof. It is.

上記補強芯材４をセグメント１に直接取付ける場合の手段は適宜であるが、本実施形態においてはセグメント１のトンネル軸方向ほぼ中央部の鋼板部分１ａに打設または溶接等で固着したスタッドボルト４１と、そのスタッドボルト４１にねじ込んだナット４２とで取付けている。また上記補強芯材４を貫通小孔３ａに取付けるための固着具６としては、上記カバー板３の内面側（トンネル空間側）から上記貫通小孔３ａに抜け止め係止可能な固着具を用いるとよく、本実施形態においては、図３に示すようにハンガーボルト６１とそれに螺合する蝶ナット６２とが用いられている。   The means for directly attaching the reinforcing core member 4 to the segment 1 is appropriate, but in this embodiment, a stud bolt 41 fixed to the steel plate portion 1a at the substantially central portion in the tunnel axis direction of the segment 1 by driving or welding. And a nut 42 screwed into the stud bolt 41. Further, as the fixing tool 6 for attaching the reinforcing core member 4 to the through small hole 3a, a fixing tool that can be retained and locked to the through small hole 3a from the inner surface side (tunnel space side) of the cover plate 3 is used. In this embodiment, as shown in FIG. 3, a hanger bolt 61 and a wing nut 62 screwed to the hanger bolt 61 are used.

本発明に使用するカバー板は、耐火性能に悪影響を及ぼさないよう不燃性であることが望ましく、施工性を考慮すれば、繊維強化セメント板やけい酸カルシウム板等の窯業系ボードが好適である。特に、曲げ強度３０Ｎ／ｍｍ２以上、曲げ動弾性係数１０〜１５ｋＮ／ｍｍ２程度の高じん性ボードを用いると、トンネル覆工内面の曲面に沿って、セグメントの凹部の閉塞を好適に行うことができる。このような高じん性ボードは、例えば、マトリックス原料としてセメントを、繊維原料としてセルロースパルプおよびビニロン繊維を使用し、湿式混合して抄造し加圧成形後養生硬化することにより製造することができる。カバー板として窯業系ボードを用いる場合、その厚さは３〜８ｍｍが好適である。厚さが３ｍｍを下回ると、施工に際して割れが発生しやくすなり、一方８ｍｍを上回ると、トンネル覆工内面の曲面に沿った施工が行いにくくなるからである。カバー板に貫通小孔を設ける方法は、繊維強化セメント板やけい酸カルシウム板等の有孔板を製造するための公知の方法を用いればよい。 The cover plate used in the present invention is desirably non-flammable so as not to adversely affect the fire resistance, and considering the workability, ceramic-based boards such as fiber reinforced cement boards and calcium silicate boards are suitable. . In particular, when a highly tough board having a bending strength of 30 N / mm 2 or more and a bending kinematic elastic coefficient of about 10 to 15 kN / mm 2 is used, the concave portion of the segment is preferably closed along the curved surface of the tunnel lining inner surface. Can do. Such a high toughness board can be manufactured, for example, by using cement as a matrix raw material and cellulose pulp and vinylon fiber as a fiber raw material, wet-mixing and making paper, curing after press molding, and curing. When a ceramic board is used as the cover plate, the thickness is preferably 3 to 8 mm. If the thickness is less than 3 mm, cracks are likely to occur during construction, whereas if the thickness exceeds 8 mm, construction along the curved surface of the tunnel lining inner surface becomes difficult. A known method for manufacturing a perforated plate such as a fiber reinforced cement plate or a calcium silicate plate may be used as a method of providing through holes in the cover plate.

上記固着具６で補強芯材４をカバー板３に取付けるに当たっては、図４（ａ）に示すようにハンガーボルト６１のＬ字形に屈曲した基部６１ａをカバー板３の内面側から上記貫通小孔３ａ内に挿入すると共に、上記基部６１ａと反対側の雄ねじ部６１ｂに蝶ナット６２をねじ込んで、その蝶ナット６２と上記Ｌ字形基部６１ａとの間に上記カバー板３と補強芯材４とを挟んで締め付け固定すればよい。   When the reinforcing core member 4 is attached to the cover plate 3 with the fixing tool 6, the base 61 a bent in an L shape of the hanger bolt 61 is formed from the inner surface side of the cover plate 3 as shown in FIG. The wing nut 62 is screwed into the male screw portion 61b opposite to the base portion 61a, and the cover plate 3 and the reinforcing core member 4 are inserted between the wing nut 62 and the L-shaped base portion 61a. What is necessary is just to pinch and fix.

なお、上記補強芯材４の上記セグメント１やカバー板３に対する取付部分は、図示例のようにセグメント側に突出させて、それ以外の部分は上記セグメント１やカバー板３に対して所定の間隔をおいて離間配置するとよく、上記のようにセグメント側に突出する取付部分の形成は、工場等で予め形成してもよく、或いは現場で形成するようにしてもよい。また上記取付部分を突出させるか否かに拘わらず、上記補強芯材４の上記セグメント１やカバー板３に対する取付位置は、後述する耐火材を吹き付け施工する際の施工性や施工後の強度等を勘案して適宜設定すればよく、又その取付位置に応じて上記貫通小孔３ａの配置位置を決定すればよい。   In addition, the attachment part with respect to the said segment 1 and the cover board 3 of the said reinforcing core material 4 is made to project to the segment side like the example of illustration, and other parts are predetermined spacing with respect to the said segment 1 and the cover board 3 The mounting portion protruding toward the segment side as described above may be formed in advance at a factory or the like, or may be formed on site. Regardless of whether the mounting portion is projected or not, the mounting position of the reinforcing core member 4 with respect to the segment 1 and the cover plate 3 is the workability when spraying a fireproof material, which will be described later, the strength after construction, and the like. May be set as appropriate, and the arrangement position of the through hole 3a may be determined according to the mounting position.

さらに上記の取付位置が多少変動しても上記補強芯材４をカバー板３に良好に取付け支持させることができるように、前記複数個の貫通小孔３ａの配置間隔（配置ピッチ）等を設定すればよい。それによって、例えばトンネルの軸線がカーブした箇所や他の理由で補強芯材４の取付位置が変動したり変更したい場合にも上記複数個の貫通小孔３ａのいずれかに適宜選択的に変更することによって、上記補強芯材４を容易に且つ安定性よく取付け支持させることができる。また例えば上記補強芯材４として各種のラス網を用いる場合、それらはメーカー毎に固定方法が異なるが、いずれの場合にも適応可能である。   Furthermore, the arrangement interval (arrangement pitch) of the plurality of through small holes 3a is set so that the reinforcing core member 4 can be satisfactorily attached to and supported by the cover plate 3 even if the attachment position is slightly changed. do it. Accordingly, for example, when the mounting position of the reinforcing core member 4 is changed or changed due to a curved portion of the tunnel axis or for other reasons, it is selectively changed to one of the plurality of through small holes 3a. Thus, the reinforcing core member 4 can be attached and supported easily and stably. For example, when various lath nets are used as the reinforcing core member 4, they have different fixing methods for each manufacturer, but can be applied to any case.

上記のようにして凹部１０を覆うカバー板３を含めてトンネル覆工内面を構成するセグメント１の内面に補強芯材４を敷設して固着具６で取付け支持させたところで、図３および図４（ｂ）に示すように補強芯材４を埋設するようにして上記セグメント１の内面に耐火材５を吹き付け施工するもので、そのとき上記補強芯材４は上記のように安定性よく取付け支持されているので、上記耐火材５の吹き付け圧力等で上記補強芯材４がずれたり浮き上がることなく円滑に施工できると共に、施工後は上記耐火材５のセグメント１およびカバー板３との直接的な接合力と相まって上記補強芯材４による補強効果と、補強芯材４を介した支持力とによって上記耐火材５を強固に且つ安定性よく施工できるものである。   When the reinforcing core material 4 is laid on the inner surface of the segment 1 constituting the inner surface of the tunnel lining including the cover plate 3 covering the recess 10 as described above and attached and supported by the fixing tool 6, FIGS. As shown in (b), a refractory material 5 is sprayed on the inner surface of the segment 1 so as to embed the reinforcing core material 4, and the reinforcing core material 4 is attached and supported with good stability as described above. Therefore, the reinforcing core material 4 can be smoothly constructed without being displaced or lifted by the spraying pressure of the refractory material 5 or the like, and after construction, the refractory material 5 is directly connected to the segment 1 and the cover plate 3. The refractory material 5 can be firmly and stably constructed by the reinforcing effect of the reinforcing core material 4 combined with the joining force and the support force via the reinforcing core material 4.

なお、本発明において、吹き付け施工する耐火材は、所定の耐火性能を得られるものであれば特に限定されるものではい。また吹き付け施工方法としては、トンネル内での施工ということを考慮すれば、発塵の少ない湿式法が好適である。その湿式法による耐火材の吹き付け施工の例として、原料としてセメントおよび繊維（ガラス繊維、ロックウール、セルロースパルプ、合成有機繊維）を使用し、必要に応じて充填材（炭酸カルシウム粉末、ウォラストナイト粉末（または針状粉末）、水酸化アルミニウム粉末等）を原料として併用し、これらの原料を湿式混合し、吹き付けガンを介して吹き付け施工する方法を挙げることができる。   In the present invention, the refractory material to be sprayed is not particularly limited as long as a predetermined fire resistance can be obtained. As a spraying construction method, a wet method with less dust generation is suitable in consideration of construction in a tunnel. As an example of refractory material spraying by the wet method, cement and fiber (glass fiber, rock wool, cellulose pulp, synthetic organic fiber) are used as raw materials, and fillers (calcium carbonate powder, wollastonite) as necessary Examples thereof include a method in which powder (or needle-like powder), aluminum hydroxide powder, etc.) are used together as raw materials, these raw materials are wet-mixed, and sprayed through a spray gun.

上記のようにして吹き付け施工した耐火材５の表面は、必要に応じて適宜コテ等で平滑に均すようにしてもよく、また必要に応じて耐火材５の表面に内装板７を取付けるようにしてもよい。その場合、上記補強芯材４を取付けるためのボルト・ナット等の固着具を利用して取付けると、別途内装板を取付けるための固着具が不要となり構造簡単に取り付けることができる。図５はその一例を示すもので、本例はパネル７ａに複数の内装タイル７ｂが接着されたタイルパネル式の内装板７を取り付けるに際し、該パネル７ａの４隅に位置する内装タイル７ｂに形成されたスリット７ｃに、取付金具７１の折曲片７１ｂ等を挿し込み、前記ハンガーボルト６１の雄ねじ部６１ｂを耐火材５の表面よりもトンネル内空側に延長突出させ、その延長突出させた雄ねじ部６１ｂを、取付金具７１の取付基部７１ａに形成した取付孔（不図示）に挿通して、その先端にナット７２をねじ込んで締め付け固定した構成である。   The surface of the refractory material 5 sprayed as described above may be smoothed with a trowel or the like as appropriate, and the interior plate 7 may be attached to the surface of the refractory material 5 as necessary. It may be. In that case, if a fixing tool such as a bolt or a nut for mounting the reinforcing core member 4 is used, a fixing tool for mounting the interior plate is not required, and the structure can be easily attached. FIG. 5 shows an example. In this example, when a tile panel type interior plate 7 having a plurality of interior tiles 7b bonded thereto is attached to the panel 7a, it is formed on the interior tiles 7b located at the four corners of the panel 7a. The bent piece 71b of the mounting bracket 71 is inserted into the slit 7c, and the male screw portion 61b of the hanger bolt 61 is extended and protruded from the surface of the refractory material 5 toward the inner space of the tunnel. The portion 61b is inserted into a mounting hole (not shown) formed in the mounting base 71a of the mounting bracket 71, and a nut 72 is screwed to the tip thereof to be fastened and fixed.

なお前記のように必要に応じてセグメント１の内面の鋼板部分１ａにスタッドボルト４１とナット４２とで補強芯材４を直接取付ける場合には、例えば上記ハンガーボルト６１と同様に、スタッドボルト４１のセグメント１と反対側の端部を耐火材５の表面よりもトンネル内空側に延長突出させ、その突出部に上記と同様の取付金具７１を取付けて、その取付金具７１により上記と同様の要領で内装板７を取付ければよい。   When the reinforcing core 4 is directly attached to the steel plate portion 1a on the inner surface of the segment 1 with the stud bolt 41 and the nut 42 as necessary as described above, the stud bolt 41 of the stud bolt 41 is, for example, similar to the hanger bolt 61 described above. The end opposite to the segment 1 is extended and projected from the surface of the refractory material 5 to the inner side of the tunnel, and a mounting bracket 71 similar to the above is attached to the protruding portion. The interior plate 7 may be attached.

前記のように補強芯材４を貫通小孔３ａに取付けるための固着具６として、前記ハンガーボルト６１のようにカバー板３の内面側（トンネル空間側）から上記貫通小孔３ａに抜け止め係止可能な固着具を用いると、前記の凹部１０側に作業者の手や工具を挿入できない場合にも、補強芯材４の取付けが可能となる。また上記ハンガーボルト６１にねじ込むナットとして前記のような蝶ナット６２を用いると工具等を用いることなく素手でも取付けることができる。また上記蝶ナット６２は前記図４（ｂ）のように耐火材５中に埋設されると、回動不能となって緩みが生じるのを良好に防止できる利点もある。   As described above, as the fixing tool 6 for attaching the reinforcing core member 4 to the small through hole 3a, like the hanger bolt 61, from the inner surface side (tunnel space side) of the cover plate 3 to the through small hole 3a. When a fixing tool that can be stopped is used, the reinforcing core member 4 can be attached even when the operator's hand or tool cannot be inserted into the concave portion 10 side. Further, when the wing nut 62 as described above is used as a nut to be screwed into the hanger bolt 61, it can be attached with bare hands without using a tool or the like. Further, when the wing nut 62 is embedded in the refractory material 5 as shown in FIG. 4 (b), there is also an advantage that it is possible to satisfactorily prevent loosening due to the impossibility of rotation.

ただし、上記貫通小孔３ａに抜け止め係止可能な固着具６としては、上記のようなハンガーボルト６１に限らず、ブラインドプラグやブラインドボルト、その他各種のワンサイドボルト等を用いることもできる。また上記カバー板３の各貫通小孔３ａの凹部１０側の面に予めナットを接着または溶接等で固着しておくか、上記各貫通小孔３ａに雌ねじを形成しておけば、それらにボルト特に蝶ボルトを螺合するだけで補強芯材４をカバー板３に取付けることができる。さらに上記カバー板３として不燃性ボードを用いると出火時の耐久性がよく、特に高じん性の不燃性ボードを用いると、トンネルの曲面に沿って湾曲させたときに、その曲面によく馴染むので、ひび割れ等が生じることなく良好に施工できる等の利点がある。   However, the fixing tool 6 that can be retained and locked in the through hole 3a is not limited to the hanger bolt 61 as described above, and a blind plug, a blind bolt, and other various one-side bolts can also be used. Further, if a nut is fixed to the surface of the through hole 3a of the cover plate 3 on the concave portion 10 side in advance by bonding or welding or a female screw is formed in each through hole 3a, a bolt is attached to them. In particular, the reinforcing core member 4 can be attached to the cover plate 3 only by screwing the butterfly bolt. Furthermore, if a non-combustible board is used as the cover plate 3, the durability at the time of fire will be good, and if a highly tough non-combustible board is used, it will adapt well to the curved surface when curved along the curved surface of the tunnel. There are advantages such as good construction without cracks.

また上記実施形態は、トンネル覆工用セグメントとしてダクタイルセグメントを用い、そのセグメント接続用凹溝等の凹部１０をカバー板３で閉塞する場合を例示したが、例えばトンネル内の換気用の空気孔やその他の凹部がセグメント内面側にあるものにも適用できる。特に上記凹部が比較的大きくて耐火材を吹き付け施工するのに支障がある場合には、それらもカバー板３で閉塞するのが望ましい。さらにダクタイルセグメントに限らず例えば図６に示すような鋼製セグメントにも適用できる。   Moreover, although the said embodiment illustrated the case where the duct plate segment was used as a tunnel lining segment, and the recessed parts 10, such as the groove for connecting the segment, were obstruct | occluded with the cover board 3, for example, the air hole for ventilation in a tunnel, The present invention can also be applied to other concave portions on the inner surface side of the segment. In particular, when the recesses are relatively large and there is a problem in spraying the refractory material, it is desirable to close them with the cover plate 3 as well. Furthermore, the present invention can be applied not only to ductile segments but also to steel segments as shown in FIG.

図７は上記図６に示す円弧状の鋼製セグメント１で形成されたトンネル覆工内面に耐火材を吹き付け施工する状態の一例を示すもので、上記セグメント１は、図６および図７に示すようにトンネル周方向に延びる桁材１１と、周方向に隣接するセグメント同士の接続面となる継手板１２等よりなり、上記桁材１１のトンネル軸方向両端部のセグメント内面側への折返部１１ａ・１１ａ間に、それとほぼ平行に中央湾曲板１３が設けられ、その中央湾曲板１３と上記折返部１１ａ・１１ａとの間に開口凹部１０が設けられている。図中、１４は補強リブ、１５はその補強リブ１４および上記中央湾曲板１３と上記桁材１１の外周面との間に放射方向に介在させた補強板である。   FIG. 7 shows an example of a state in which a refractory material is sprayed on the inner surface of the tunnel lining formed by the arcuate steel segment 1 shown in FIG. 6, and the segment 1 is shown in FIG. 6 and FIG. In this way, the beam member 11 extending in the tunnel circumferential direction and the joint plate 12 serving as a connection surface between the segments adjacent in the circumferential direction, etc. A central curved plate 13 is provided between the central curved plate 11 and the parallel curved portion 11a between the central curved plate 13 and the folded portions 11a and 11a. In the figure, 14 is a reinforcing rib, and 15 is a reinforcing plate that is interposed between the reinforcing rib 14 and the central curved plate 13 and the outer peripheral surface of the girder 11 in the radial direction.

そして上記凹部１０を覆うようにして上記セグメント１の内周面ほぼ全面に前記実施形態と同様のカバー板３を配置して適宜の手段で固定するもので、図の場合はカバー板３の端部は前記と同様の要領で断面Ｌ字形の取付金具３０等を介して継手板１２等に固定すると共に、カバー板３の中央部は断面Ｚ字形の取付金具３５等を介して補強リブ１４等に固定けた構成である。なお、上記取付金具３５は、前記取付金具３０と同様に、一端側はセグメント１の鋼板部分（図の場合は継手板１２）に打設または溶接等で固着したスタッドボルト３１と、そのスタッドボルト３１にねじ込んだナット３２とでセグメント１に取付けられ、他端側は通常のボルト３３とクリップナット３４とでカバー板３に固定されている。そして、上記カバー板３の内面に前記と同様の補強芯材４を配置して、上記カバー板３に所定の間隔をおいて複数設けた貫通小孔３ａに、前記と同様の固着具６を介して取付け支持させると共に、上記カバー板３の内面に上記補強芯材４を埋め込むようにして耐火材５を吹き付け施工した構成である。   Then, a cover plate 3 similar to that of the above embodiment is disposed on almost the entire inner peripheral surface of the segment 1 so as to cover the concave portion 10 and is fixed by an appropriate means. The portion is fixed to the joint plate 12 or the like via the mounting bracket 30 or the like having an L-shaped cross section in the same manner as described above, and the reinforcing rib 14 or the like at the center portion of the cover plate 3 via the mounting bracket 35 or the like having a Z-shaped cross section It is a configuration fixed to. The mounting bracket 35 is similar to the mounting bracket 30 in that the one end is fixed to the steel plate portion of the segment 1 (joint plate 12 in the figure) by placing or welding, and the stud bolt 31. It is attached to the segment 1 with a nut 32 screwed into 31, and the other end side is fixed to the cover plate 3 with a normal bolt 33 and a clip nut 34. Then, the same reinforcing core material 4 as that described above is arranged on the inner surface of the cover plate 3, and the same fixing tool 6 as described above is inserted into a plurality of through small holes 3 a provided at predetermined intervals on the cover plate 3. In addition, the refractory material 5 is sprayed and applied so that the reinforcing core material 4 is embedded in the inner surface of the cover plate 3.

上記のように構成することによって鋼製セグメントを用いたトンネル覆工内面にも前記のダクタイルセグメントを用いたトンネル覆工内面と同様に耐火材５を容易・迅速に吹き付け施工することができる。さらに上記のダクタイルセグメントやな鋼製セグメントに限らず、それ以外のセグメントを用いたトンネル覆工内面にも適用可能であり、特にセグメント内周面に比較的大きな凹部を有する場合にも耐火材を現場で容易・迅速に吹き付け施工できるものである。   By configuring as described above, the refractory material 5 can be sprayed and applied to the inner surface of the tunnel lining using the steel segment as easily and quickly as the inner surface of the tunnel lining using the ductile segment. Furthermore, it is applicable not only to the above ductile segments and steel segments but also to tunnel lining inner surfaces using other segments. It can be easily and quickly sprayed on site.

以上のように本発明によるトンネル覆工内面への耐火材吹き付け施工方法によれば、トンネル覆工内面を構成するトンネル覆工用セグメントの内面に比較的大きな凹部を有する場合にあっても、耐火材の吹き付け施工を、容易・迅速に且つ安定性よく行うことができるもので、耐火性能がよく、しかも施工が容易な耐火処理が求められている最近の道路トンネルや鉄道トンネルにおける耐火処理工事に有効に適用可能である。   As described above, according to the method for spraying a refractory material on the inner surface of a tunnel lining according to the present invention, even if the inner surface of the tunnel lining segment constituting the inner surface of the tunnel lining has a relatively large recess, It can be applied easily and quickly with good stability, and it is suitable for fireproof construction in recent road tunnels and railway tunnels that require fireproofing with good fire resistance and easy construction. Effectively applicable.

（ａ）は本発明による耐火材吹き付け施工方法を適用したトンネル覆工内面の横断平面図、（ｂ）はその内面図、（ｃ）は（ｂ）におけるｃ−ｃ断面図。(A) is the cross-sectional top view of the tunnel lining inner surface which applied the refractory material spraying construction method by this invention, (b) is the inner surface figure, (c) is cc sectional drawing in (b). （ａ）および（ｂ）はそれぞれ図１（ａ）および（ｂ）の一部の拡大図。(A) And (b) is an enlarged drawing of a part of Drawing 1 (a) and (b), respectively. 耐火材を吹き付け施工した状態のトンネル覆工内面の一部の拡大横断平面図。The expanded cross-sectional top view of a part of tunnel lining inner surface of the state which sprayed and constructed the refractory material. （ａ）は補強芯材のカバー板に対する取付部の拡大図、（ｂ）は耐火材を吹き付け施工した状態の同上図。(A) is an enlarged view of the attachment part with respect to the cover board of a reinforcement core, (b) is the same figure of the state which sprayed and constructed the refractory material. 耐火材を吹き付け施工した状態のトンネル覆工内面の一部の拡大横断平面図。The expanded cross-sectional top view of a part of tunnel lining inner surface of the state which sprayed and constructed the refractory material. 鋼製セグメントの一例を示す斜視図。The perspective view which shows an example of steel segments. 上記鋼製セグメントで形成されたトンネル覆工内面に耐火材を吹き付け施工する状態の一例を示す断面図。Sectional drawing which shows an example of the state which sprays and constructs a refractory material to the tunnel lining inner surface formed with the said steel segments.

符号の説明Explanation of symbols

Ｔ トンネル
１ セグメント
１ａ 鋼板部分
１ｂ コンクリート部分
１０ 凹部
２ 連結具
２１ ボルト
２２ ナット
３ カバー板
３ａ 貫通小孔
３０ 連結金具
３１ スタッドボルト
３２、３４ ナット
３３ ボルト
４ 補強芯材
５ 耐火材
６ 固着具
６１ ハンガーボルト
６２ 蝶ナット
７ 内装板 T tunnel 1 segment 1a steel plate portion 1b concrete portion 10 recess 2 connector 21 bolt 22 nut 3 cover plate 3a through hole 30 connector 31 stud bolt 32, 34 nut 33 bolt 4 reinforcing core material 5 refractory material 6 fixing device 61 hanger Bolt 62 Wing nut 7 Interior plate

Claims (3)

掘削したトンネル内面に覆工用セグメントを付設して形成してなるトンネル覆工内面に耐火材を吹き付け施工するに当たり、上記覆工用セグメントの内面に形成されている凹部を、補強芯材取付用の貫通小孔を所定の間隔をおいて複数設けた不燃性のカバー板で閉塞し、次いで上記カバー板の表面を含むトンネル覆工内面に補強芯材を配設して該補強芯材を上記複数個の貫通小孔のいずれかに選択的に固着具を介して取付け支持し、次いで上記カバー板の表面を含むトンネル覆工内面に上記補強芯材を埋め込むようにして耐火材を吹き付け施工することを特徴とするトンネル覆工内面への耐火材吹き付け施工方法。   When the fireproof material is sprayed onto the tunnel lining inner surface formed by attaching a lining segment to the inner surface of the excavated tunnel, the concave portion formed on the inner surface of the lining segment is attached to the reinforcing core material. The through hole is closed with a non-combustible cover plate provided at a predetermined interval, and then a reinforcing core material is disposed on the tunnel lining inner surface including the surface of the cover plate, and the reinforcing core material is Attaching and supporting selectively through one of a plurality of through-holes via a fixing tool, and then spraying a refractory material so that the reinforcing core material is embedded in the inner surface of the tunnel covering including the surface of the cover plate. A refractory spraying method on the inner surface of a tunnel lining characterized by this. 上記固着具として上記カバー板の表面側から上記貫通小孔に抜け止め係止可能な固着具を用い、その固着具を上記複数個の貫通小孔のいずれかに選択的に抜け止め係止することによって上記補強芯材を上記カバー板に取付け支持させるようにした請求項１に記載のトンネル覆工内面への耐火材吹き付け施工方法。   As the fixing tool, a fixing tool that can be retained and locked to the through hole from the surface side of the cover plate is used, and the fixing tool is selectively retained and locked to one of the plurality of through holes. The method for spraying a refractory material onto the inner surface of a tunnel lining according to claim 1, wherein the reinforcing core member is attached to and supported by the cover plate. 上記カバー板として高じん性の不燃性ボードを用いる請求項１または２に記載のトンネル覆工内面への耐火材吹き付け施工方法。   The method for spraying a refractory material onto the inner surface of a tunnel lining according to claim 1 or 2, wherein a highly tough non-combustible board is used as the cover plate.
JP2006196610A 2006-07-19 2006-07-19 How to spray fireproof material on the inner surface of tunnel lining Expired - Fee Related JP4688219B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102758440A (en) * 2011-04-28 2012-10-31 成都中铁隆工程集团有限公司 Open-cut tunnel construction method

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* Cited by examiner, † Cited by third party
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CN103775105A (en) * 2014-02-20 2014-05-07 中铁十局集团第三建设有限公司 Double hinge joint turnover type tunnel lining trolley steel end mold

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003239693A (en) * 2002-02-20 2003-08-27 Taiheiyo Cement Corp Tunnel fire-resistive covering structure
JP2005098092A (en) * 2003-08-29 2005-04-14 Taiheiyo Material Kk Refractory mounting member and segment structure with refractory material

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003239693A (en) * 2002-02-20 2003-08-27 Taiheiyo Cement Corp Tunnel fire-resistive covering structure
JP2005098092A (en) * 2003-08-29 2005-04-14 Taiheiyo Material Kk Refractory mounting member and segment structure with refractory material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102758440A (en) * 2011-04-28 2012-10-31 成都中铁隆工程集团有限公司 Open-cut tunnel construction method

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