JP4447964B2 - Flexible joint of underground structure with heat-resistant structure - Google Patents

Flexible joint of underground structure with heat-resistant structure Download PDF

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JP4447964B2
JP4447964B2 JP2004164598A JP2004164598A JP4447964B2 JP 4447964 B2 JP4447964 B2 JP 4447964B2 JP 2004164598 A JP2004164598 A JP 2004164598A JP 2004164598 A JP2004164598 A JP 2004164598A JP 4447964 B2 JP4447964 B2 JP 4447964B2
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underground structure
refractory material
joint
underground
refractory
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吉則 浅沼
敬士 小沼
成夫 下澤
光喜 奈良
秋康 山田
功知 越智
巌 西岡
伸高 小原
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Taisei Corp
Nichias Corp
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Description

本発明は、地下鉄、共同溝、洞道、地下道、地下街及び各種地下トンネル等の地下構築物の継手に関し、特に耐熱構造を備えた可撓継手に関する。   The present invention relates to joints for underground structures such as subways, joint grooves, caves, underground passages, underground shopping streets, and various underground tunnels, and more particularly to flexible joints having a heat resistant structure.

従来より、上下水道、地下鉄、共同溝、洞道、地下道、地下街及び各種地下トンネル等の地下構築物の継手として、地下構築物の対向端面間に、ゴム・合成樹脂等の弾性材によって形成された可撓止水部材の両端部をそれぞれ水密的に取り付け、地下構築物間の止水を行うと共にその変形によって地盤の不等沈下等に伴う接続地下構築物の相対変位を許容するようにしたいわゆる可撓継手がある。可撓止水部材は、その中央に内周側へのくびれ部が形成されており、このくびれ部によって幅方向に大きな変形が可能であって地下構築物の大きな離接変位を許容し得るようになっているものである。   Conventionally, joints for underground structures such as water and sewage systems, subways, common grooves, caves, underground passages, underground shopping streets, and various underground tunnels, can be formed between elastic material such as rubber and synthetic resin between opposing end surfaces of underground structures. So-called flexible joints, which are watertightly attached to both ends of the stiffening water member, perform waterstop between the underground structures, and allow deformation of the connected underground structures due to unequal settlement of the ground due to the deformation. There is. The flexible waterproofing member has a constricted portion on the inner peripheral side at the center, and the constricted portion can be greatly deformed in the width direction so as to allow a large separable displacement of the underground structure. It is what has become.

ところで、このような可撓継手を用いる地下構築物において火災が発生した場合、可撓止水部材が燃焼して焼け落ちたり、燃焼しないまでも高温による劣化が生じるとその機能が損われ、また地下構築物が海底トンネルの場合は、可撓止水部材が焼け落ちれば海水がトンネル内に浸水するといった事態が生じるおそれがある。   By the way, when a fire occurs in an underground structure using such a flexible joint, if the flexible water-stopping member burns and burns down, or if it does not burn, its function is impaired, and the underground In the case where the structure is a submarine tunnel, there is a risk that seawater may be flooded into the tunnel if the flexible water-stopping member burns down.

このような不具合を防ぐために、特許文献１に開示のごとく、可撓止水部材の内側に、耐熱性と断熱性を有する耐熱部材を伸縮変形可能な形状で配設する構成が提案されている。
特開平１０−２５２１２６号公報 In order to prevent such inconveniences, as disclosed in Patent Document 1, a configuration in which a heat-resistant member having heat resistance and heat insulation is disposed in a shape that can be expanded and contracted inside the flexible water-stopping member has been proposed. .
JP 10-252126 A

ところで、大規模火災時において可撓止水部材の温度をその耐熱許容温度以下とするためには、厚い耐熱部材が必要となる（例えば１００℃以下に抑えるにはセラミックファイバーブランケットで１００ｍｍ以上の厚さが必要）が、そのような厚い耐熱部材を可撓止水部材が許容する地下構築物の大きな離接変位を許容し得るように伸縮変形可能として配設することは極めて難しく、また、加工や装着作業も面倒であるという問題がある。   By the way, in order to keep the temperature of the flexible water-stopping member below its allowable temperature limit in a large-scale fire, a thick heat-resistant member is required (for example, a thickness of 100 mm or more with a ceramic fiber blanket to keep it below 100 ° C. However, it is extremely difficult to dispose such a thick heat-resistant member so that it can be deformed so as to allow large displacement of the underground structure allowed by the flexible waterproofing member. There is a problem that the mounting work is also troublesome.

本発明は、上記問題に鑑みてなされたものであって、加工や装着を容易に行うことができると共に地下構築物の大きな離接変位を許容し得る耐熱構造を備えた地下構築物の可撓継手を提供することを目的とする。   The present invention has been made in view of the above problems, and is a flexible joint for an underground structure that can be easily processed and mounted and has a heat-resistant structure that can allow a large displacement of the underground structure. The purpose is to provide.

上記目的を達成する本発明の耐熱構造を備えた地下構築物の可撓継手は、
接続される地下構築物の対向する端面にそれぞれ固定された地下構築物の周方向に連続する継手枠体間に、可撓止水部材が地下構築物の周方向に連続して水密的に架設されると共に、
前記可撓止水部材の内周側の前記継手枠体間に外側耐火材と内側耐火材の二層の耐火材が径方向に所定間隔で配設されており、
前記継手枠体は、前記地下構築物の外周と略同一外径で周方向に連続する外面板と、該外面板の外端部に当該継手の軸方向と直交して設けられた周方向に連続する板状で所定高さの結合桁部材と、
前記外面板の内端部に当該継手の軸方向と直交して設けられた周方向に連続する板状で前記結合桁部材より低い支持桁部材と、
を備えて前記結合桁部材で前記地下構築物に結合され、
前記外側耐火材は、内側に膨出する変形許容屈曲部が形成されて前記支持桁部材の内縁部に前記対向する継手枠体を連結して配設され、
前記内側耐火材は、外側に膨出する変形許容屈曲部が形成されて前記結合桁部材の内縁部に前記対向する継手枠体を連結して配設され、
前記可撓止水部材の変形と前記耐火材のそれぞれの変形許容屈曲部の屈曲・伸展によって前記接続地下構築物の相対変位に追随するように構成されていることを特徴とする。 A flexible joint of an underground structure having the heat-resistant structure of the present invention that achieves the above object is as follows.
A flexible water-stopping member is continuously and watertightly laid in the circumferential direction of the underground structure between the joint frames continuous in the circumferential direction of the underground structure respectively fixed to the opposing end surfaces of the connected underground structure. ,
Two layers of refractory materials, an outer refractory material and an inner refractory material, are arranged at predetermined intervals in the radial direction between the joint frame bodies on the inner peripheral side of the flexible water stop member,
The joint frame body has an outer surface plate that is substantially the same outer diameter as the outer periphery of the underground structure and is continuous in the circumferential direction, and a circumferential direction that is provided at an outer end portion of the outer surface plate perpendicular to the axial direction of the joint A connecting girder member of a predetermined height with a plate shape,
A supporting girder member lower than the coupling girder member in a plate shape continuous in the circumferential direction provided orthogonal to the axial direction of the joint at the inner end of the outer surface plate,
Coupled to the underground structure with the coupling girder member,
The outer refractory material is formed by forming a deformation-permissible bending portion that bulges inward and connecting the opposing joint frame to the inner edge of the support beam member,
The inner refractory material is formed by forming a deformation-permissible bending portion that bulges outward and connecting the opposing joint frame to the inner edge of the coupling beam member,
It is configured to follow the relative displacement of the connection underground structure by deformation of the flexible water-stopping member and bending / extension of each deformation-allowable bending portion of the refractory material.

本発明の１側面において、地下構造物の継手は、該地下構造物の内周面に所定の空間を隔てて固定された地下構造物用耐火シートをさらに備え、該耐火シートの内周面は該内側耐火材の内周面と同一平面を形成し、該内側耐火材は幅方向両端部において該耐火シートと該地下構造物の間の該空間に挿入されていることを特徴とする。   In one aspect of the present invention, the joint of the underground structure further includes a fireproof sheet for an underground structure fixed to the inner peripheral surface of the underground structure with a predetermined space therebetween, and the inner peripheral surface of the fireproof sheet is The inner refractory material is formed in the same plane as the inner peripheral surface, and the inner refractory material is inserted into the space between the refractory sheet and the underground structure at both ends in the width direction.

本発明の１側面において、該耐火材は無機質フアイバーと、該無機質フアイバーを保護するために該無機質フアイバーを被覆する不燃性シートからなることを特徴とする。   In one aspect of the present invention, the refractory material comprises an inorganic fiber and a non-combustible sheet that covers the inorganic fiber in order to protect the inorganic fiber.

本発明の他の側面において、該無機質フアイバーはセラミックフアイバー、ロックウールおよびグラスウールからなる群から選択される材料からなり、該不燃性シートはガラスクロスおよびガラスクロスをシリコンコーティングした材料からなる群から選択される材料からなることを特徴とする。   In another aspect of the present invention, the inorganic fiber is made of a material selected from the group consisting of ceramic fiber, rock wool and glass wool, and the non-combustible sheet is selected from the group consisting of a glass cloth and a glass-coated material made of silicon cloth. It is made of a material to be made.

好ましい１実施形態において、継手は該内側耐火材の内周面を高耐熱鋼材で被覆したことを特徴とする。   In a preferred embodiment, the joint is characterized in that the inner peripheral surface of the inner refractory material is coated with a high heat-resistant steel material.

請求項１に係る発明の耐熱構造を備えた地下構築物の可撓継手によれば、火災の際には二層の耐火材とその間の空間が可撓止水部材への熱を遮断して可撓止水部材の焼損を防ぎ、万一火災の際の復旧交換も必要な側のみ独立して行うことができる。耐火材は薄く構成することができ、加工や装着を容易に行うことができると共に地下構築物の大きな離接変位を許容し得るように構成できる。   According to the flexible joint of an underground structure having the heat-resistant structure of the invention according to claim 1, in the event of a fire, the two layers of refractory material and the space between them can block the heat to the flexible waterproofing member. It is possible to prevent the stiffening water member from being burned out and to carry out recovery replacement in the event of a fire independently only on the necessary side. The refractory material can be configured to be thin, can be easily processed and mounted, and can be configured to allow large displacement of the underground structure.

また、請求項２に係る発明の耐熱構造を備えた地下構築物の可撓継手によれば、火災の際には外側耐火材と内側耐火材の二層の耐火材とその間の空間が可撓止水部材への熱を遮断して可撓止水部材の焼損を防ぎ、万一火災の際の復旧交換も必要な側のみ独立して行うことができる。耐火材は薄く構成することができ、加工や装着を容易に行うことができると共に地下構築物の大きな離接変位を許容し得るように構成できる。可撓セグメントとしてシールド工法によって施工される場合には、推力受け材の配設空間に耐火材を配設することで合理的に構成できる。   According to the flexible joint for an underground structure having a heat-resistant structure according to the second aspect of the present invention, in the event of a fire, the two layers of the outer refractory material and the inner refractory material and the space between them are not flexible. The heat to the water member is cut off to prevent the flexible water-stopping member from being burned out, and recovery and replacement in the event of a fire can be performed independently only on the necessary side. The refractory material can be configured to be thin, can be easily processed and mounted, and can be configured to allow large displacement of the underground structure. When the flexible segment is constructed by the shield method, it can be rationally configured by disposing a refractory material in the space where the thrust receiving material is disposed.

請求項３の継手によれば、地下構造物自体も耐火シートで保護されており、さらに該耐火シートと地下構造物の間の空間が熱の絶縁体となるので地下構造物の耐火性も向上し、また地下構造物を伝った熱により耐火材や可撓止水部材に影響がおよぶことを防止することができる。また内側耐火材の幅方向両端部がこの空間に挿入されているので、境界部での断熱性が向上する。   According to the joint of claim 3, the underground structure itself is also protected by the fireproof sheet, and the space between the fireproof sheet and the underground structure becomes a thermal insulator, so that the fire resistance of the underground structure is also improved. In addition, it is possible to prevent the heat-resistant material and the flexible water-stopping member from being affected by the heat transmitted through the underground structure. Moreover, since the width direction both ends of the inner side refractory material are inserted in this space, the heat insulation in a boundary part improves.

更に、耐火材を請求項４，５に係る発明の耐火材とすることにより、不定形の無機質フアイバーを定形化して加工や装着を容易と成し得ると共に、吸水性を向上し、また飛散を防ぐことができる。   Furthermore, by using the refractory material as the refractory material of the inventions according to claims 4 and 5, the amorphous inorganic fiber can be shaped to facilitate processing and mounting, improve water absorption, and prevent scattering. Can be prevented.

以下、添付図面を参照して本発明を実施するための最良の形態について説明する。
図１は本発明に係る耐熱構造を備えた地下構築物の可撓継手の一構成例であって図２に斜視図を示す地下構築物の継手部位のＡ−Ａ断面図である。 The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a structural example of a flexible joint of an underground structure having a heat-resistant structure according to the present invention, and is a cross-sectional view taken along line AA of the joint part of the underground structure shown in a perspective view in FIG.

図示地下構築物１，１’は、シールド工法によって施工される断面形状が円形の地下トンネルであって、スチールセグメント，コンクリートセグメント，ダクタイルセグメント等のセグメント１０，１０’を円筒状に組み立てて構成されるものである。尚、継手２による結合部はカバープレート５０によって覆われており、図２には表れていない。   The illustrated underground structure 1, 1 'is an underground tunnel having a circular cross-section constructed by a shield method, and is constructed by assembling segments 10, 10' such as steel segments, concrete segments, and ductile segments into a cylindrical shape. Is. In addition, the coupling | bond part by the coupling 2 is covered with the cover plate 50, and does not appear in FIG.

継手２は、結合するそれぞれの地下構築物１，１’の端面に固定される左右対称の一対の継手枠体としての継手枠２０，２０’が、可撓止水部材としての止水ゴム３０で水密的に連結されると共に、その内周側に耐火材４０が二重に配設されて（外側耐火材４１，内側耐火材４２）構成されている。左右の継手枠２０，２０’の形状は対称であり、以下、一方の継手枠２０の側について説明し、他方の継手枠２０’の側はダッシュ（’）を付した番号を付して説明を省略する。尚、継手枠２０，２０’は、セグメント１０，１０’と同様に周方向に複数のピース（周分割ピース）に分割されたいわゆる可撓セグメントとして構成されており、周方向に複数連結することで地下構築物１，１’と対応する所定の径の円環状となるようになっているものである。   In the joint 2, joint frames 20 and 20 ′ as a pair of left and right symmetrical joint frames fixed to the end faces of the respective underground structures 1 and 1 ′ to be coupled are water-stopping rubbers 30 as flexible water-stopping members. In addition to being watertightly connected, the refractory material 40 is doubled on the inner peripheral side (outer refractory material 41, inner refractory material 42). The shapes of the left and right joint frames 20 and 20 'are symmetric. Hereinafter, the side of one joint frame 20 will be described, and the side of the other joint frame 20' will be described with a number attached with a dash ('). Is omitted. The joint frames 20 and 20 'are configured as so-called flexible segments that are divided into a plurality of pieces (circumferentially divided pieces) in the circumferential direction like the segments 10 and 10', and a plurality of the joint frames 20 and 20 'are connected in the circumferential direction. Thus, an annular structure with a predetermined diameter corresponding to the underground structures 1 and 1 'is formed.

継手枠２０は、地下構築物１の外面と等しい曲率で屈曲された所定幅で板状の外面板としてのスキンプレート２１の内面に、結合桁部材としての主桁２２と、支持桁部材としての副桁２３がそれぞれ溶接固定されると共に、これらの間に縦リブ２４が配設されて構成され、主桁２２が図示しないリング間ボルトによって地下構築物１を構成するセグメント１０に締結されることで、地下構築物１に固定されている。   The joint frame 20 has a main girder 22 as a coupling girder member and a sub girder as a support girder member on the inner surface of a skin plate 21 as a plate-like outer surface plate having a predetermined width bent with a curvature equal to that of the outer surface of the underground structure 1. The girders 23 are welded and fixed, and the vertical ribs 24 are arranged between them, and the main girders 22 are fastened to the segments 10 constituting the underground structure 1 by bolts between rings (not shown). It is fixed to the underground structure 1.

主桁２２は、スキンプレート２１の外端部（地下構築物１側の端部）に板面を地下構築物１の軸方向と直交する方向として溶接固定されており、その高さ（径方向の幅）は地下構築物１を構成するセグメント１０と等しい。   The main girder 22 is welded and fixed to the outer end of the skin plate 21 (the end on the underground structure 1 side) so that the plate surface is perpendicular to the axial direction of the underground structure 1, and its height (width in the radial direction) ) Is equal to the segment 10 constituting the underground structure 1.

副桁２３は、スキンプレート２１の内端部に板面を地下構築物１の軸方向と直交する方向として溶接固定されている、その高さは主桁２２の高さの１／２以下に設定されており、ここに、止水ゴム３０の側縁が固定されている。尚、この副桁２３の高さの規定は、後述する推力受材７０の厚さを継手枠２０の全体厚さの１／２以上としたいとの要求から生じたものであり、好ましくは主桁２２の高さの１／２以下であるが、主桁２２の高さの７０％以下であれば許容し得る。   The sub-girder 23 is welded and fixed to the inner end of the skin plate 21 with the plate surface orthogonal to the axial direction of the underground structure 1, and the height is set to ½ or less of the height of the main girder 22. Here, the side edge of the water stop rubber 30 is fixed. The definition of the height of the sub-girder 23 is a result of a request to make the thickness of a thrust receiving member 70 described later to be 1/2 or more of the total thickness of the joint frame 20, The height of the girder 22 is ½ or less, but 70% or less of the height of the main girder 22 is acceptable.

縦リブ２４は、主桁２２と副桁２３の間にこれらと直交状態（板面を当該継手の軸方向として）介装固定され、周方向に所定の間隔で複数配設されている。   The vertical ribs 24 are interposed and fixed between the main girder 22 and the sub-girder 23 in an orthogonal state (with the plate surface as the axial direction of the joint), and a plurality of vertical ribs 24 are arranged at predetermined intervals in the circumferential direction.

上記のごとき両継手枠２０，２０’は、それぞれ地下構築物１，１’を構成するセグメント１０，１０’に主桁２２，２２’で固定され、継手枠２０，２０’の外周面（スキンプレート２１，２１’の外周面）に両者間を跨ぐカバープレート５１が設けられると共に、所定の間隔を有する両副桁２３，２３’間に止水ゴム３０が架設されている。止水ゴム３０の外周側には発泡ゴムによる板状の目地材５２が介装され、更に、止水ゴム３０の内周側に二層の耐火材４０（外側耐火材４１，内側耐火材４２）が配設されている。   The joint frames 20 and 20 ′ as described above are fixed to the segments 10 and 10 ′ constituting the underground structures 1 and 1 ′ with main girders 22 and 22 ′, respectively, and the outer peripheral surfaces (skin plates) of the joint frames 20 and 20 ′. A cover plate 51 straddling the two is provided on the outer peripheral surfaces of 21 and 21 ′, and a waterproof rubber 30 is installed between the sub-girder 23 and 23 ′ having a predetermined interval. A plate-shaped joint material 52 made of foamed rubber is interposed on the outer peripheral side of the water-stopping rubber 30, and two layers of fire-resistant materials 40 (an outer refractory material 41 and an inner refractory material 42 are provided on the inner peripheral side of the water-stop rubber 30. ) Is arranged.

止水ゴム３０は、ゴムや合成樹脂等の所定硬度の弾性素材によって、副桁２３，２３’の間隔と対応する幅で、両側縁に内周側に屈曲した取付部３１を備えると共に幅方向中央に内側にＶ字状に屈曲突出した変形屈曲部３２を備えて形成されており、両端の取付部３１が取付ボルト５３によって副桁２３，２３’に水密的に締着され、内外の水密性を保って継手枠２０，２０’を連結するように配設されている。   The waterstop rubber 30 is provided with a mounting portion 31 that is bent to the inner peripheral side at both side edges with a width corresponding to the interval between the sub-beams 23 and 23 'by an elastic material having a predetermined hardness such as rubber or synthetic resin, and in the width direction. It is formed with a deformed bent portion 32 that is bent and protruded in a V shape inwardly in the center, and the attachment portions 31 at both ends are watertightly fastened to the sub-girder 23, 23 'by attachment bolts 53, so The joint frames 20 and 20 'are arranged so as to maintain the properties.

耐火材４０は、図３に図１のＸ部拡大図を示すように、断熱性を有する無機質フアイバー４０Ａを、断熱性を有する保護シート４０Ｂでくるんで所定厚さの板状に形成されている。   The refractory material 40 is formed in a plate shape having a predetermined thickness by wrapping an inorganic fiber 40A having heat insulation properties with a protective sheet 40B having heat insulation properties, as shown in FIG. .

無機質フアイバー４０Ａは、セラミックフアイバー、ロックウールおよびグラスウールからなる群から選ばれる材料からなることが好ましい。図示の実施形態においては、セラミックフアイバーのブランケットを使用している。   The inorganic fiber 40A is preferably made of a material selected from the group consisting of ceramic fiber, rock wool, and glass wool. In the illustrated embodiment, a ceramic fiber blanket is used.

保護シート４０Ｂは、耐熱性を有すると共に変形も容易なグラスクロスまたはグラスクロスにシリコンコーティングを施した材料からなる不燃性シートで形成することが好ましく、綿状のセラミックファイバーブランケット４０Ａをこのような保護シート４０Ｂでくるむことで定形化すると共に吸水性を向上し、飛散を防ぐようになっている。   The protective sheet 40B is preferably formed of a glass cloth that is heat resistant and easily deformed, or a non-combustible sheet made of a material in which a glass cloth is coated with a silicon coating, and the cotton-like ceramic fiber blanket 40A is thus protected. It is shaped by wrapping with the sheet 40B, improves water absorption, and prevents scattering.

このような耐火材４０の固定は、継手枠２０，２０’又は後述するブラケット６０に立設されたスタッドボルト５４によって行われている。即ち、図１のＸ部拡大図である図３に示すように、当該耐火材４０に形成された取付穴４０Ｃを貫通して突出するスタッドボルト５４に螺合したナット５６によってワッシャー５５を介して固定されているものである。ワッシャー５５の耐火材４０側の面にはシリコン接着剤が塗布され、これによって当該部位からの耐火材４０の内部への水の侵入を防ぐようになっている。耐火材４０の固定にはスタッドボルトのほか、ナットを溶接した植込みボルトによってもよく、材質としてはＳＵＳ３０４、ＳＵＳ３１６等が好ましい。さらに、取付穴４０Ｃはシリコンシーラー等のシーラーでシールすることにより火災時の炎を遮断することが好ましい。このシーラーは不燃性を有し、有毒ガス発生のおそれがないことが必要である。   The refractory material 40 is fixed by a stud bolt 54 erected on the joint frames 20, 20 ′ or a bracket 60 described later. That is, as shown in FIG. 3 which is an enlarged view of the portion X in FIG. 1, the nut 56 is screwed into the stud bolt 54 protruding through the mounting hole 40C formed in the refractory material 40 via the washer 55. It is fixed. A silicon adhesive is applied to the surface of the washer 55 on the side of the refractory material 40, thereby preventing water from entering the inside of the refractory material 40 from the portion. The refractory material 40 may be fixed by a stud bolt or an implanted bolt welded with a nut. The material is preferably SUS304, SUS316 or the like. Furthermore, it is preferable that the mounting hole 40C is sealed with a sealer such as a silicon sealer to block a flame during a fire. This sealer must be nonflammable and free from the risk of toxic gas generation.

耐火材４０は、前述のごとく外側耐火材４１と内側耐火材４２の二層に配設されており、外側耐火材４１と内側耐火材４２の間に隔絶された所定厚さの空間（耐火空間４３）が形成されている。   As described above, the refractory material 40 is disposed in two layers of the outer refractory material 41 and the inner refractory material 42, and is a space (fire refractory space) that is isolated between the outer refractory material 41 and the inner refractory material 42. 43) is formed.

外側耐火材４１は、両縁の内周側に屈曲した装着部４１Ａでそれぞれ主桁２２，２２’の対向面に固定されると共に副桁２３，２３’の内周端縁端面に固定されて、副桁２３，２３’の内周縁に沿って両継手枠２０，２０’を連結するように装着されている。その幅方向中央には、内周側に膨出するように屈曲した変形許容屈曲部４１Ｂが形成されている。   The outer refractory material 41 is fixed to the opposing surfaces of the main girders 22 and 22 'by the mounting portions 41A bent to the inner peripheral sides of both edges, and is fixed to the inner peripheral end edges of the sub-girder 23 and 23'. The joint frames 20 and 20 'are mounted so as to be connected along the inner peripheral edges of the sub-beams 23 and 23'. At the center in the width direction, a deformation allowable bending portion 41B that is bent so as to bulge toward the inner peripheral side is formed.

内側耐火材４２は、その両縁が主桁２２，２２’の内周縁に沿って水平に延び、それぞれブラケット６０を介して主桁２２，２２’に固定されて両継手枠２０，２０’を連結するように装着されている。その幅方向中央には、外周側に膨出するように屈曲した変形許容屈曲部４２Ａが形成されている。   Both edges of the inner refractory material 42 extend horizontally along the inner peripheral edges of the main girders 22 and 22 ′, and are fixed to the main girders 22 and 22 ′ via the brackets 60 to connect the joint frames 20 and 20 ′. It is mounted to connect. At the center in the width direction, a deformation allowable bending portion 42A that is bent so as to bulge toward the outer peripheral side is formed.

ブラケット６０は、スタッドボルト５４が立設された支持板６２を、主桁２２，２２’の対向面に溶接固定されたナット５７にボルト５８で固定された断面形状Ｌ字状の支持金具６１で支持して構成されている。支持板６２Ｂは主桁２２，２２’の内周縁に沿って位置し、この支持板６２Ｂに立設されたスタッドボルト５４に内側耐火材４２が固定されている。   The bracket 60 is an L-shaped support fitting 61 having a L-shaped cross section in which a support plate 62 on which a stud bolt 54 is erected is fixed to a nut 57 welded and fixed to the opposing surfaces of the main girders 22 and 22 ′ with a bolt 58. It is configured to support. The support plate 62B is located along the inner peripheral edge of the main beam 22, 22 ', and the inner refractory material 42 is fixed to a stud bolt 54 erected on the support plate 62B.

左右のブラケット６０の支持板６２の間は所定間隔を有しており、内側耐火材４２はこの間隔にその変形許容屈曲部４２Ａを嵌入させて主桁２２，２２’の内周縁の内側に配設されている。このように主桁２２，２２’の内周縁の内側に位置することで、内側耐火材４２は可撓セグメントの周方向の結合構造に拘わりなく周方向全周に亘って連続した配設が可能となっている。   There is a predetermined interval between the support plates 62 of the left and right brackets 60, and the inner refractory material 42 is disposed inside the inner peripheral edges of the main girders 22 and 22 ′ by inserting the deformation allowable bending portion 42 A at this interval. It is installed. Thus, the inner refractory material 42 can be continuously arranged over the entire circumference in the circumferential direction regardless of the coupling structure in the circumferential direction of the flexible segment. It has become.

内側耐火材４２の内周面４２Ｃは、耐熱鋼材例えば市場性を考慮してＳＵＳ３１６等のＳＵＳ材またはＮＣＦ材で被覆し、火災時の燃焼ガス圧力の耐火材４２への影響を防ぐことが好ましい。ＳＵＳ材の厚みは０．０１〜１．０ｍｍの範囲内で火災想定条件により選択する。   The inner peripheral surface 42C of the inner refractory material 42 is preferably coated with a heat resistant steel material, for example, a SUS material such as SUS316 or an NCF material in consideration of marketability, to prevent the combustion gas pressure during fire from affecting the refractory material 42. . The thickness of the SUS material is selected in the range of 0.01 to 1.0 mm according to the assumed fire condition.

ここで、上記継手２を地下構築物１，１’間に設置する（継手２によって地下構築物１，１’を接続する）施工時には、図４に断面図を示すように、左右両継手枠２０，２０’が主桁２２，２２’の間（耐火材４０の装着部位）に介装された推力受材７０によって結合され、掘進時に作用する推力を推力受材７０が受けて両継手枠２ ０，２０’の間隔を維持し、止水ゴム３０の形状を保つ。止水ゴム３０が装着される副桁２３の高さは前述のごとく主桁２２の高さの１／２以下に設定されていることから、推力受材７０の径方向の厚さを継手厚さの１／２以上に設定することができ、掘進時の推力を安定して受けることができる。このようにして掘進が完了した後、推力受材７０が撤去され、ここに耐火材４０が装着されて前述の設置状態とされる。尚、内側耐火材４２を支持するブラケット６０は、推力受材７０の撤去後の内側耐火材４２の装着時に取り付けられるため、ブラケット６０が推力受材７０や外側耐火材４１の装着の障害とはならない。   Here, when constructing the joint 2 between the underground structures 1 and 1 ′ (connecting the underground structures 1 and 1 ′ by the joint 2), as shown in a sectional view in FIG. 20 'is coupled by a thrust receiving member 70 interposed between the main girders 22 and 22' (attachment portion of the refractory material 40), and the thrust receiving member 70 receives the thrust acting during excavation, and both joint frames 20 are connected. , 20 ′, and the shape of the water stop rubber 30 is maintained. Since the height of the sub girder 23 to which the water stop rubber 30 is attached is set to ½ or less of the height of the main girder 22 as described above, the thickness in the radial direction of the thrust receiving member 70 is set to the joint thickness. It can be set to 1/2 or more of this, and the thrust at the time of excavation can be received stably. After the excavation is completed in this manner, the thrust receiving material 70 is removed, and the refractory material 40 is attached to the above-described installation state. Since the bracket 60 that supports the inner refractory material 42 is attached when the inner refractory material 42 is mounted after the thrust receiving material 70 is removed, the bracket 60 is an obstacle to the mounting of the thrust refractory material 70 and the outer refractory material 41. Don't be.

上記のごとく構成された継手２は、止水ゴム３０が地下構築物１，１’内外の水密性を保つと共に耐火材４０が火災による止水ゴム３０の焼損を防ぐ。地震や地盤の不等沈下等によって生ずる地下構築物１，１’の相対変位に際しては、止水ゴム３０はその変形屈曲部３２で弾性変形し、外側耐火材４１はその変形許容屈曲部４１Ｂで屈曲・伸展すると共に内側耐火材４２はその変形許容屈曲部４２Ａで屈曲・伸展して破損することなく追随する。   In the joint 2 configured as described above, the water-stopping rubber 30 maintains the watertightness inside and outside the underground structures 1 and 1 ′, and the refractory material 40 prevents the water-stopping rubber 30 from being burned out due to a fire. Upon relative displacement of the underground structures 1 and 1 ′ caused by an earthquake or uneven subsidence of the ground, the waterproof rubber 30 is elastically deformed by the deformable bent portion 32, and the outer refractory material 41 is bent by the deformable allowable bent portion 41 </ b> B. -While extending, the inner refractory material 42 bends and extends at its deformable bending portion 42A and follows without being damaged.

耐火材４１、４２の変位量は、継手に要求される変位量に合わせて、変形屈曲部の膨らみ状態を調節するにより調節することができ、たとえば追随変位量を３０〜１００ｍｍ、せん断変位量を３０〜２００ｍｍに設定する。   The amount of displacement of the refractory materials 41 and 42 can be adjusted by adjusting the bulging state of the deformed bent portion in accordance with the amount of displacement required for the joint. For example, the following displacement amount is 30 to 100 mm, and the shear displacement amount is Set to 30-200 mm.

耐火材４０は、外側耐火材４１と内側耐火材４２の二重に配設されると共に両者の間に耐火空間４３が形成されていることにより、大規模火災に際しても止水ゴム３０を焼損から守ることができる。また、二層にしたことでそれぞれを薄く変形し易く形成できると共に、加工や装着等の取り扱いが容易となり、火災後の復旧作業も容易に行うことができるものである。例えば、厚さ５０ｍｍのセラミックファイバーブランケット用いることで、火災時において内側耐火材４２がそれより外側の温度を鋼材耐熱許容温度３５０℃以下に抑え、更に、耐火空間４３と外側耐熱材４１でその外側に位置する止水ゴム３０を耐熱許容温度１００℃以下に抑えるように構成することができる。このため、二次覆工省略型構造で二次覆工コンクリートによる耐火構造でないシールドトンネルに適するものである。   The refractory material 40 is disposed in a double manner of the outer refractory material 41 and the inner refractory material 42 and has a refractory space 43 formed between them. I can protect it. In addition, since the two layers are formed, each can be formed thinly and easily deformed, and handling such as processing and mounting becomes easy, and recovery work after a fire can be easily performed. For example, by using a ceramic fiber blanket with a thickness of 50 mm, the temperature outside the inner refractory 42 is suppressed to 350 ° C. or less at the heat resistant temperature of the steel material in the event of a fire. It is possible to configure the water stop rubber 30 located in the position to be kept at a heat resistant allowable temperature of 100 ° C. or lower. For this reason, it is suitable for the shield tunnel which is not a fireproof structure by secondary lining concrete with a secondary lining omission type structure.

図５は本発明の継手の他の構成例を示す図１と同様の断面図である。図５において、図１と同一構成要素は同一符号で示し、その詳細な説明を省略する。   FIG. 5 is a cross-sectional view similar to FIG. 1 showing another configuration example of the joint of the present invention. 5, the same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

図５の構成例においては、地下構造物１０、１０’の内周面１０Ａ,１０’Ａに所定の空間７２を隔ててスタッドボルト等により固定された地下構造物用耐火シート７０をさらに備え、該耐火シート７０の内周面７０Ａは内側耐火材４２の内周面４２Ｃと同一平面を形成し、内側耐火材４２は幅方向両端部４２Ｂにおいて耐火シート７０と地下構造物１０．１０’の間の空間７２に挿入されている。この構成により、地下構造物１０、１０’自体も耐火シート７０で保護されており、さらに該耐火シート７０と地下構造物の間の空間７２が熱の絶縁体となるので地下構造物１０、１０’の耐火性も向上し、また地下構造物１０、１０’を伝った熱により耐火材４１、４２や可撓止水部材３２に影響がおよぶことを防止することができる。また内側耐火材４２の幅方向両端部４２Ｂがこの空間７２に挿入されているので、継手の止水性も向上する。なお、７４は内側耐火材の両端側より張出した形で設置し、中央部が重なった構造で、火災時の風圧が直接耐火シートに掛からない構造となっている。   In the configuration example of FIG. 5, the underground structure 10, 10 ′ further includes a fireproof sheet 70 for the underground structure fixed to the inner peripheral surfaces 10 A, 10 ′ A by a stud bolt or the like with a predetermined space 72. The inner peripheral surface 70A of the refractory sheet 70 forms the same plane as the inner peripheral surface 42C of the inner refractory material 42, and the inner refractory material 42 is located between the refractory sheet 70 and the underground structure 10.10 ′ at both end portions 42B in the width direction. Is inserted into the space 72. With this configuration, the underground structures 10 and 10 ′ themselves are also protected by the fireproof sheet 70, and further, since the space 72 between the fireproof sheet 70 and the underground structure becomes a thermal insulator, the underground structures 10 and 10 The fire resistance of 'can also be improved, and the heat transmitted through the underground structures 10 and 10' can be prevented from affecting the refractory materials 41 and 42 and the flexible waterproofing member 32. Moreover, since the width direction both ends 42B of the inner side refractory material 42 are inserted in this space 72, the water stop of a joint also improves. In addition, 74 is installed in the form overhanging from the both ends of the inner refractory material, and has a structure in which the central portion overlaps, so that the wind pressure during a fire is not directly applied to the refractory sheet.

尚、上記各構成例では、本発明をセグメントによって構成される地下構築物の接続に適用した例を示したが、これに限らず一体の暗渠に適用しても良い。又、暗渠の断面形状は円形に限らず、楕円形、四角形、その他の多角形のいずれであっても良いものである。   In each of the above configuration examples, an example in which the present invention is applied to connection of an underground structure constituted by segments is shown, but the present invention is not limited to this, and may be applied to an integrated culvert. Further, the cross-sectional shape of the underdrain is not limited to a circle, and may be any one of an ellipse, a rectangle, and other polygons.

本発明に係る耐熱構造を備えた地下構築物の可撓継手の一構成例であり、図２のＡ−Ａ断面図である。It is a structural example of the flexible joint of the underground structure provided with the heat-resistant structure which concerns on this invention, and is AA sectional drawing of FIG. 地下構築物の斜視図である。It is a perspective view of an underground structure. 耐火材の装着部位を示す図１のＸ部拡大図である。It is the X section enlarged view of FIG. 1 which shows the attachment site | part of a refractory material. 継手施工時の断面図である。It is sectional drawing at the time of joint construction. 本発明の継手の他の構成例を示す図１と同様の断面図である。It is sectional drawing similar to FIG. 1 which shows the other structural example of the coupling of this invention.

符号の説明Explanation of symbols

１，１’ 地下構築物
２ 継手
２０，２０’ 継手枠体
２１ スキンプレート（外面板）
２２ 主桁（結合桁部材）
２３ 副桁（支持桁部材）
３０ 止水ゴム（可撓止水部材）
４０ 耐火材
４０Ａ 無機質フアイバー
４０Ｂ 保護シート
４１ 外側耐火材（耐火材）
４１Ｂ 変形許容屈曲部
４２ 内側耐火材（耐火材）
４２Ａ 変形許容屈曲部

1, 1 'underground structure 2 joint 20, 20' joint frame 21 skin plate (outer plate)
22 Main girder (joint girder member)
23 Sub girder (support girder member)
30 Water stop rubber (flexible water stop member)
40 Refractory material 40A Inorganic fiber 40B Protection sheet 41 Outer refractory material (refractory material)
41B Deformation allowable bending part 42 Inside refractory material (refractory material)
42A Deformation allowable bending part

Claims (5)

接続される地下構築物の対向する端面にそれぞれ固定された地下構築物の周方向に連続する継手枠体間に、可撓止水部材が地下構築物の周方向に連続して水密的に架設されると共に、
前記可撓止水部材の内周側の前記継手枠体間に外側耐火材と内側耐火材の二層の耐火材が径方向に所定間隔で配設されており、
前記継手枠体は、前記地下構築物の外周と略同一外径で周方向に連続する外面板と、該外面板の外端部に当該継手の軸方向と直交して設けられた周方向に連続する板状で所定高さの結合桁部材と、
前記外面板の内端部に当該継手の軸方向と直交して設けられた周方向に連続する板状で前記結合桁部材より低い支持桁部材と、
を備えて前記結合桁部材で前記地下構築物に結合され、
前記外側耐火材は、内側に膨出する変形許容屈曲部が形成されて前記支持桁部材の内縁部に前記対向する継手枠体を連結して配設され、
前記内側耐火材は、外側に膨出する変形許容屈曲部が形成されて前記結合桁部材の内縁部に前記対向する継手枠体を連結して配設され、
前記可撓止水部材の変形と前記耐火材のそれぞれの変形許容屈曲部の屈曲・伸展によって前記接続地下構築物の相対変位に追随するように構成されていることを特徴とする耐熱構造を備えた地下構築物の継手。 A flexible water-stopping member is continuously and watertightly laid in the circumferential direction of the underground structure between the joint frames continuous in the circumferential direction of the underground structure respectively fixed to the opposing end surfaces of the connected underground structure. ,
Two layers of refractory materials, an outer refractory material and an inner refractory material, are arranged at predetermined intervals in the radial direction between the joint frame bodies on the inner peripheral side of the flexible water stop member,
The joint frame body has an outer surface plate that is substantially the same outer diameter as the outer periphery of the underground structure and is continuous in the circumferential direction, and a circumferential direction that is provided at an outer end portion of the outer surface plate perpendicular to the axial direction of the joint A connecting girder member of a predetermined height with a plate shape,
A supporting girder member lower than the coupling girder member in a plate shape continuous in the circumferential direction provided orthogonal to the axial direction of the joint at the inner end of the outer surface plate,
Coupled to the underground structure with the coupling girder member,
The outer refractory material is formed by forming a deformation-permissible bending portion that bulges inward and connecting the opposing joint frame to the inner edge of the support beam member,
The inner refractory material is formed by forming a deformation-permissible bending portion that bulges outward and connecting the opposing joint frame to the inner edge of the coupling beam member,
Provided with a heat-resistant structure configured to follow the relative displacement of the connection underground structure by deformation of the flexible water-stopping member and bending / extension of each deformation-allowed bending portion of the refractory material Joints for underground structures. 該地下構造物の内周面に所定の空間を隔てて固定された地下構造物用耐火シートをさらに備え、
該耐火シートの内周面は該内側耐火材の内周面と同一平面を形成し、該内側耐火材は幅方向両端部において該耐火シートと該地下構造物の間の該空間に挿入されていることを特徴とする請求項１記載の地下構造物の継手。 It further comprises a fireproof sheet for an underground structure fixed to the inner peripheral surface of the underground structure with a predetermined space therebetween,
The inner peripheral surface of the refractory sheet forms the same plane as the inner peripheral surface of the inner refractory material, and the inner refractory material is inserted into the space between the refractory sheet and the underground structure at both ends in the width direction. The joint for an underground structure according to claim 1, wherein: 該耐火材は無機質フアイバーと、該無機質フアイバーを保護するために該無機質フアイバーを被覆する不燃性シートからなることを特徴とする請求項１または２に記載の地下構造物の継手。 The joint for underground structures according to claim 1 or 2 , wherein the refractory material comprises an inorganic fiber and a nonflammable sheet for covering the inorganic fiber in order to protect the inorganic fiber. 該無機質フアイバーはセラミックフアイバー、ロックウールおよびグラスウールからなる群から選択される材料からなり、
該不燃性シートはガラスクロスおよびガラスクロスをシリコンコーティングした材料からなる群から選択される材料からなることを特徴とする請求項３記載の地下構造物の継手。 The inorganic fiber comprises a material selected from the group consisting of ceramic fiber, rock wool and glass wool;
The joint of an underground structure according to claim 3, wherein the non-combustible sheet is made of a material selected from the group consisting of a glass cloth and a material obtained by coating the glass cloth with silicon. 該内側耐火材の内周面を高耐熱鋼材で被覆したことを特徴とする請求項１〜４のいずれかに記載の地下構造物の継手。 The joint of an underground structure according to any one of claims 1 to 4 , wherein an inner peripheral surface of the inner refractory material is covered with a high heat-resistant steel material.
JP2004164598A 2004-06-02 2004-06-02 Flexible joint of underground structure with heat-resistant structure Expired - Lifetime JP4447964B2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106013473A (en) * 2016-07-06 2016-10-12 铁道第三勘察设计院集团有限公司 Deformation joint structure for light rail elevated station and construction method thereof

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Publication number Priority date Publication date Assignee Title
KR101193216B1 (en) 2010-06-18 2012-10-19 (주)대우건설 Structure of spreading fireproof material continuously for improving fireproof function of connection of variable undersea structure
JP5559413B1 (en) * 2013-11-11 2014-07-23 鹿島建設株式会社 Fireproof structure of flexible joints for underground structures

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106013473A (en) * 2016-07-06 2016-10-12 铁道第三勘察设计院集团有限公司 Deformation joint structure for light rail elevated station and construction method thereof

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