JP2014005719A - Form device for tunnel lining - Google Patents

Form device for tunnel lining Download PDF

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JP2014005719A
JP2014005719A JP2013005851A JP2013005851A JP2014005719A JP 2014005719 A JP2014005719 A JP 2014005719A JP 2013005851 A JP2013005851 A JP 2013005851A JP 2013005851 A JP2013005851 A JP 2013005851A JP 2014005719 A JP2014005719 A JP 2014005719A
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tunnel
formwork
lining
auxiliary
mold member
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JP6146895B2 (en
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Takehiro Ito
毅浩 伊藤
Toshihiko Komatsu
敏彦 小松
Koji Shida
孝司 志田
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Maeda Corp
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Maeda Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a form device for tunnel lining, which can reduce labor hours and costs required to construct, transport, assemble, and dismantle a movable form by constructing lining with one movable form even when each part has different cross sectional radii in an extension direction of a tunnel.SOLUTION: A form device for tunnel lining includes: a form member 40 installed on a truck 11 movable to an extension direction of a tunnel and for constructing a lining member 30 while corresponding to an internal surface 20 of a minimum sectional radius part of the tunnel; and an auxiliary form member for constructing the lining member 30 while corresponding to the internal surface 20 with a larger radius than the minimum sectional radius part by installing to an outer peripheral surface of the form member 40. The auxiliary form member includes: a top end auxiliary form member 50a formed by spreading a thin plate-like metal sheet 90 on the outer peripheral surface of a steel frame; and a side wall part auxiliary form member 50b formed by foam plastic materials.

Description

本発明は、トンネル覆工用型枠装置に関するものであり、詳しくは、延長方向に沿って横断面径が異なる箇所が存在するトンネルにおいて、既存の移動式型枠を応用して、拡幅アーチ構造体を施工することが可能なトンネル覆工用型枠装置に関するものである。   TECHNICAL FIELD The present invention relates to a tunnel lining formwork apparatus, and more specifically, in a tunnel where there are portions having different cross-sectional diameters along the extension direction, an existing mobile formwork is applied to widen arch structure. The present invention relates to a tunnel lining formwork apparatus capable of constructing a body.

NATM工法等を利用して掘削した山岳トンネルでは、トンネル内壁面に覆工を施工する際に、トンネル形状をした移動式型枠(セントル)を用いて覆工コンクリート等を打ち込むのが一般的である。また、移動式型枠は、トンネルの横断面形状に合わせて専用に作成される。   In mountain tunnels excavated using the NATM method, it is common to drive lining concrete using a tunnel-shaped mobile formwork (centre) when lining the tunnel wall. is there. In addition, the mobile formwork is created exclusively for the cross-sectional shape of the tunnel.

従来、トンネル覆工を施工するための移動式型枠に関して、種々の技術が提案されている(例えば、特許文献1参照)。特許文献1に記載された技術は、コンクリートをトンネル覆工用の型枠内に高密度に充填でき、耐久性に優れたトンネル覆工を形成可能としたものである。このトンネル覆工の施工方法は、トンネル内に型枠を設置して覆工用のコンクリートを打設する工程において、圧力測定手段によって型枠内におけるコンクリートの充填圧を計測して、コンクリートの充填圧を型枠の変形または破壊が生じない範囲に調整するものである。   Conventionally, various techniques have been proposed regarding a movable formwork for constructing a tunnel lining (see, for example, Patent Document 1). The technique described in Patent Document 1 can form a tunnel lining excellent in durability by filling concrete into a tunnel lining form with high density. In this tunnel lining construction method, in the process of placing a formwork in the tunnel and placing concrete for lining, the concrete filling pressure is measured by measuring the concrete filling pressure in the formwork by pressure measuring means. The pressure is adjusted within a range in which deformation or destruction of the formwork does not occur.

特開2008−88696号公報JP 2008-88696 A

トンネルの延長方向において断面半径(内空断面の半径)が同一であれば、1つのセントルを用いて当該トンネルの全長にわたって覆工を施工することが可能である。しかしながら、トンネルの途中には、種々の要因により、トンネル本体部と断面半径が異なる部分が存在することが多々ある。さらに、トンネルの複数箇所において、断面半径がそれぞれ異なる場合もある。   If the cross-sectional radius (radius of the inner air cross-section) is the same in the tunnel extension direction, it is possible to construct a lining over the entire length of the tunnel using one centle. However, in the middle of the tunnel, there are often portions where the cross-sectional radius is different from the tunnel main body due to various factors. Furthermore, the cross-sectional radii may be different at a plurality of locations in the tunnel.

このように、1つのトンネルで複数の形状の覆工を施工する場合には、各断面形状に合わせて、それぞれ型枠形状が異なる移動式型枠(セントル)が必要となり、その製作、運搬、組み立て及び解体には、多大な時間とコストを要してしまう。   In this way, when lining a plurality of shapes in one tunnel, a movable formwork (centre) with a different formwork shape is required according to each cross-sectional shape, and its production, transportation, Assembling and dismantling require a great deal of time and cost.

本発明は、上述した事情に鑑み提案されたもので、トンネルの延長方向において断面半径がそれぞれ異なる部分が存在する場合であっても、1つの移動式型枠を用いて覆工を施工することにより、移動式型枠の製作、運搬、組み立て及び解体に要する手間とコストを低減することが可能なトンネル覆工用型枠装置を提供することを目的とする。   The present invention has been proposed in view of the above-mentioned circumstances, and even if there are portions having different cross-sectional radii in the extending direction of the tunnel, lining is performed using one movable formwork. Thus, an object of the present invention is to provide a tunnel lining formwork apparatus capable of reducing labor and cost required for manufacturing, transporting, assembling and disassembling a mobile formwork.

本発明のトンネル覆工用型枠装置は、上述した目的を達成するための技術であり、特に、断面半径が異なる部分が存在するトンネルでは、横断面方向において中心点はずらさずに半径を変更することにより、断面形状を異ならせるのが一般的である点に着目し、トンネルの延長方向において断面半径がそれぞれ異なる部分が存在する場合であっても、1つの移動式型枠(セントル)を用いて覆工を施工することができるようにしたものである。   The formwork device for tunnel lining of the present invention is a technique for achieving the above-described object, and in particular, in a tunnel where there are portions having different cross-sectional radii, the radius is changed without shifting the center point in the cross-sectional direction. By paying attention to the fact that the cross-sectional shapes are generally different by doing this, even if there are portions having different cross-sectional radii in the extending direction of the tunnel, one mobile formwork (centre) is formed. It can be used to construct a lining.

すなわち、本発明のトンネル覆工用型枠装置は、延長方向で断面半径が異なるトンネルの内壁面に覆工部材を施工するための型枠装置であって、型枠部材と、補助型枠部材とを備えたことを特徴とするものである。   That is, the formwork apparatus for tunnel lining of the present invention is a formwork apparatus for constructing a lining member on the inner wall surface of a tunnel having a different cross-sectional radius in the extending direction, the formwork member and the auxiliary formwork member It is characterized by comprising.

型枠部材は、トンネルの延長方向に移動可能な台車上に設けられ、トンネルの最小断面半径部分の内壁面に対応させて覆工部材を施工するための部材である。補助型枠部材は、型枠部材の外周面に取り付けることにより、最小断面半径部分よりも半径が大きな内壁面に対応させて覆工部材を施工するための部材である。   The formwork member is a member that is provided on a carriage that is movable in the extension direction of the tunnel, and is used to construct the lining member in correspondence with the inner wall surface of the minimum cross-sectional radius portion of the tunnel. The auxiliary formwork member is a member for constructing the lining member so as to correspond to the inner wall surface having a larger radius than the minimum cross-section radius portion by being attached to the outer peripheral surface of the formwork member.

また、上述した構成に加えて、補助型枠部材は、鋼製の枠組の外周面に薄板状の金属シートを展張りして形成した天端部補助型枠部材と、発泡プラスチック材で形成した側壁部補助型枠部材とから構成することが可能である。この場合、側壁部補助型枠部材の外周面に、防水シートを展張りすることが好ましい。   Further, in addition to the above-described configuration, the auxiliary mold member is formed of a foamed plastic material and a top end auxiliary mold member formed by extending a thin metal sheet on the outer peripheral surface of the steel frame. It is possible to comprise from a side wall part auxiliary | assistant formwork member. In this case, it is preferable to spread a waterproof sheet on the outer peripheral surface of the side wall portion auxiliary mold member.

また、上述した構成に加えて、側壁部補助型枠部材は、トンネルの円周方向に沿って複数に分割されると共に、結束部材(例えば、鋼製ワイヤー)を挿通するための挿通孔を有する構成とすることが可能である。   Further, in addition to the above-described configuration, the side wall part auxiliary form member is divided into a plurality along the circumferential direction of the tunnel and has an insertion hole for inserting a binding member (for example, a steel wire). It can be configured.

また、上述した構成に加えて、型枠部材には、円周方向の両下端部に、補助型枠部材を下側から支持するための下部支承部を設けると共に、型枠部材の妻側両端部をトンネルの半径方向に拡大可能として、補助型枠部材の両端部を支持する両端部支承部を設けることが可能である。   In addition to the above-described configuration, the mold member is provided with lower support portions for supporting the auxiliary mold member from below at both lower ends in the circumferential direction, and both ends of the mold member on the wife side. It is possible to provide both end support portions that support both ends of the auxiliary mold member so that the portion can be expanded in the radial direction of the tunnel.

本発明のトンネル覆工用型枠装置は、トンネルの最小断面半径部分の内壁面に対応させて覆工部材を施工するための型枠部材を備えた移動式型枠を1機のみ用いて、断面形状が異なる部分では、型枠部材の外周面に補助型枠部材を取り付けることにより、異なる断面半径に対応させて、覆工を施工することができる。   The tunnel lining formwork apparatus of the present invention uses only one mobile formwork provided with a formwork member for constructing a lining member corresponding to the inner wall surface of the minimum cross-sectional radius portion of the tunnel, In the portion where the cross-sectional shape is different, the auxiliary formwork member is attached to the outer peripheral surface of the formwork member, so that the lining can be applied corresponding to the different cross-sectional radii.

したがって、異なる断面形状に合わせて、それぞれ移動式型枠を製作する必要がないので、移動式型枠の製作、運搬、組み立て及び解体に要する手間とコストを低減することが可能となる。   Therefore, since it is not necessary to manufacture each mobile formwork in accordance with different cross-sectional shapes, it is possible to reduce labor and cost required for manufacturing, transporting, assembling and dismantling the mobile formwork.

また、鋼製の枠組の外周面に薄板状の金属シートを展張りして形成した天端部補助型枠部材と、発泡プラスチック材で形成した側壁部補助型枠部材とにより、補助型枠部材を構成することにより、トンネルの断面形状に合わせて容易に補助型枠部材を製作することができ、手間とコストを低減することが可能となる。また、覆工部材(覆工コンクリート)の充填圧力が大きくなる可能性が高い天端部では、鋼製の枠組の外周面に薄板状の金属シートを展張りした構成とすることにより、天端部において十分な強度を確保することができる。さらに、天端部以外の側壁部では、成型が容易で軽量な発泡プラスチック材を用いることにより、この点においても、手間とコストを低減することが可能となる。   Further, an auxiliary formwork frame member is formed by a ceiling end formwork auxiliary formwork member formed by spreading a thin plate-like metal sheet on the outer peripheral surface of a steel frame structure and a side wall form auxiliary formwork frame member formed of a foamed plastic material. By constructing, the auxiliary mold member can be easily manufactured according to the cross-sectional shape of the tunnel, and the labor and cost can be reduced. In addition, at the top end where the filling pressure of the lining member (covering concrete) is likely to increase, the top end is configured by spreading a thin metal sheet on the outer peripheral surface of the steel frame. Sufficient strength can be secured in the part. Furthermore, in the side wall portion other than the top end portion, it is possible to reduce labor and cost in this respect by using a foamed plastic material that is easy to mold and lightweight.

また補助型枠部材の外周面に薄板状の金属シートや防水シートを展張りしているため、補助型枠部材の隙間にコンクリート等の覆工部材が浸入することがなく、覆工の品質及び外観を向上させることが可能となる。   Further, since a thin metal sheet or a waterproof sheet is spread on the outer peripheral surface of the auxiliary mold member, the lining member such as concrete does not enter the gap of the auxiliary mold member, and the quality of the wrapping and The appearance can be improved.

本発明の実施形態に係るトンネル覆工用型枠装置の横断面図。The cross-sectional view of the formwork device for tunnel lining according to the embodiment of the present invention. 天端部補助型枠部材を示す斜視図。The perspective view which shows a top edge part auxiliary | assistant formwork member. 型枠部材に設けた下部支承部を示す一部横断面図。The partial cross-sectional view which shows the lower support part provided in the mold member. 型枠部材に設けた両端部支承部を示す説明図。Explanatory drawing which shows the both-ends support part provided in the mold member. 側壁部補助型枠部材を示す斜視図。The perspective view which shows a side wall part auxiliary | assistant formwork member.

以下、図面を参照して、本発明のトンネル覆工用型枠装置の実施形態を説明する。図1〜図5は、本発明の実施形態に係るトンネル覆工用型枠装置を示すもので、図1はトンネル覆工用型枠装置の横断面図、図2は天端部補助型枠部材を示す斜視図、図3は下部支承部を示す一部横断面図、図4は両端部支承部を示す説明図、図5は側壁部補助型枠部材の一単位を示す斜視図である。なお、図4はトンネル全体の縦断面図ではなく、側壁部型枠部材を施工した部分におけるトンネルの縦断面図である。   Hereinafter, embodiments of a tunnel lining formwork apparatus of the present invention will be described with reference to the drawings. 1 to 5 show a tunnel lining formwork apparatus according to an embodiment of the present invention. FIG. 1 is a cross-sectional view of the tunnel lining formwork apparatus, and FIG. 2 is a top end auxiliary formwork. FIG. 3 is a partial cross-sectional view showing a lower support portion, FIG. 4 is an explanatory view showing both end support portions, and FIG. 5 is a perspective view showing one unit of a side wall portion auxiliary form member. . FIG. 4 is not a longitudinal sectional view of the entire tunnel but a longitudinal sectional view of the tunnel in a portion where the side wall mold member is constructed.

<トンネル覆工用型枠装置の概要>
本発明の実施形態に係るトンネル覆工用型枠装置10は、図1に示すように、延長方向で断面半径が異なるトンネルの内壁面20に覆工部材(例えば、充填材や覆工コンクリート)30を施工する際に使用する装置であって、1つの移動式型枠(セントル)を用いて、トンネルの全長にわたって覆工を施工することが可能な装置である。本実施形態のトンネル覆工用型枠装置10は、既存のセントルを改良して利用することができ、覆工を施工するトンネルの最小断面半径部分の内壁面20に対応させた型枠部材40と、型枠部材40の外周面に取り付ける天端部補助型枠部材50a及び側壁部補助型枠部材50bとを備えている。
<Outline of formwork device for tunnel lining>
As shown in FIG. 1, a tunnel lining formwork apparatus 10 according to an embodiment of the present invention has a lining member (for example, a filler or lining concrete) on a tunnel inner wall surface 20 having a different cross-sectional radius in the extending direction. It is an apparatus used when constructing 30 and is an apparatus capable of constructing a lining over the entire length of the tunnel using one movable formwork (centre). The tunnel lining formwork apparatus 10 of the present embodiment can be used by improving an existing centle, and the formwork member 40 corresponding to the inner wall surface 20 of the minimum cross-sectional radius portion of the tunnel to be laid. And a top end auxiliary mold member 50a and a side wall auxiliary mold member 50b attached to the outer peripheral surface of the mold member 40.

<トンネル覆工用型枠装置>
本実施形態のトンネル覆工用型枠装置10は、一般的に使用されているセントル(スライドフォーム)と称される装置を応用したものであり、図1に示すように、トンネルの内壁面20に合致したアーチ状で、トンネルの延長方向に移動可能な型枠部材40を備えている。このトンネル覆工用型枠装置10は、一対のレール60上に載置する台車11と、トンネル内空断面形状に対応した型枠部材40と、覆工部材30(例えば、充填材や覆工コンクリート)の注入装置(注入管及び圧送装置)等を備えている。
<Forming device for tunnel lining>
The tunnel lining formwork device 10 of the present embodiment is an application of a commonly used device called a centle (slide form). As shown in FIG. Is provided with a mold member 40 that is movable in the extending direction of the tunnel. This tunnel lining formwork apparatus 10 includes a carriage 11 placed on a pair of rails 60, a formwork member 40 corresponding to an empty cross-sectional shape in the tunnel, and a lining member 30 (for example, a filler or lining material). Concrete) injection device (injection pipe and pumping device) and the like.

<型枠部材>
本実施形態のトンネル覆工用型枠装置10は、図1に示すように、トンネルの最小断面半径部分の内壁面20に対応させて覆工部材30を施工するための型枠部材40を備えている。この型枠部材40は、トンネル内空断面形状に対応した鋼鉄製の板材からなる。
<Formwork member>
As shown in FIG. 1, the tunnel lining formwork apparatus 10 of the present embodiment includes a formwork member 40 for constructing the lining member 30 corresponding to the inner wall surface 20 of the minimum cross-sectional radius portion of the tunnel. ing. The mold member 40 is made of a steel plate corresponding to the hollow cross-sectional shape in the tunnel.

本実施形態の型枠部材40は、図3に示すように、円周方向の両下端部に、側壁部補助型枠部材50bを下側から支持するための下部支承部41を設けることが可能である。この下部支承部41は、型枠部材40の両下端部に対して着脱可能に設けた板状の部材であってもよいし、型枠部材40に対して回動可能に取り付けられ、モータや、油圧ジャッキ又はエアージャッキ等の駆動装置の駆動により回動する部材であってもよい。   As shown in FIG. 3, the mold member 40 of the present embodiment can be provided with lower support portions 41 for supporting the side wall auxiliary mold member 50b from the lower side at both lower ends in the circumferential direction. It is. The lower support portion 41 may be a plate-like member that is detachably attached to both lower ends of the mold member 40, or is attached to the mold member 40 so as to be rotatable. A member that rotates by driving of a driving device such as a hydraulic jack or an air jack may be used.

下部支承部41を設けた場合には、トンネルの最小断面半径部分に覆工部材30を施工する際に、下部支承部41を内壁面20へ向かって突出させない状態で覆工作業を行う。一方、トンネルの最小断面半径よりも大きな半径を有する部分では、型枠部材40の円周方向の両下端部に設けた下部支承部41を内壁面20へ向かって突出させて、この下部支承部41により側壁部補助型枠部材50bを下側から支持する。   When the lower support part 41 is provided, the cover work is performed in a state where the lower support part 41 does not protrude toward the inner wall surface 20 when the cover member 30 is constructed in the minimum cross-sectional radius portion of the tunnel. On the other hand, in a portion having a radius larger than the minimum cross-sectional radius of the tunnel, lower support portions 41 provided at both lower ends in the circumferential direction of the mold member 40 are projected toward the inner wall surface 20, and the lower support portions are provided. 41 supports the side wall auxiliary mold member 50b from below.

さらに、本実施形態の型枠部材40は、図4に示すように、その妻側両端部をトンネルの半径方向に拡大することができるようになっており、この拡径部分により、天端部補助型枠部材50a及び側壁部補助型枠部材50bの前後両端部を支持するための両端部支承部42を形成する。両端部支承部42を半径方向に進退させるための進退装置は、どのような機構であってもよいが、例えば、油圧ジャッキ、エアージャッキ等を用いることができる。   Furthermore, as shown in FIG. 4, the formwork member 40 of the present embodiment is configured such that both end portions on the end of the wife can be expanded in the radial direction of the tunnel. Both end support portions 42 for supporting the front and rear ends of the auxiliary mold member 50a and the side wall auxiliary mold member 50b are formed. The advancing / retreating device for advancing and retracting the both end support portions 42 in the radial direction may be any mechanism, and for example, a hydraulic jack, an air jack, or the like can be used.

そして、トンネルの最小断面半径部分に覆工部材30を施工する際には、妻側両端部の外周面が型枠部材40の本体部分と同一面となるようにして覆工作業を行う。一方、天端部補助型枠部材50a及び側壁部補助型枠部材50bを支持する際には、妻側両端部をトンネルの半径方向に拡大することにより、妻側両端部を型枠部材40から外側へ向かって突出した状態として、天端部補助型枠部材50a及び側壁部補助型枠部材50bの前後両端部を支持する。   And when constructing the cover member 30 in the minimum cross-section radius part of the tunnel, the cover work is performed so that the outer peripheral surfaces of both ends of the wife are flush with the main body part of the mold member 40. On the other hand, when supporting the top end auxiliary mold member 50a and the side wall auxiliary mold member 50b, the both ends of the wife side are expanded from the mold member 40 by enlarging both ends of the wife side in the radial direction of the tunnel. As the state of projecting outward, the front and rear end portions of the top end auxiliary mold member 50a and the side wall auxiliary mold member 50b are supported.

<補助型枠部材>
型枠部材40の外周面に取り付ける補助型枠部材は、図1に示すように、天端部に取り付ける天端部補助型枠部材50aと、側壁部に取り付ける側壁部補助型枠部材50bとに大別することができる。この天端部補助型枠部材50a及び側壁部補助型枠部材50bは、型枠部材40の外周面に取り付けることにより、最小断面半径部分よりも半径が大きな内壁面20に対応させて覆工部材30を施工するための部材である。なお、天端部補助型枠部材50a及び側壁部補助型枠部材50bは、トンネル覆工用型枠装置10の長さ方向(トンネル延長方向)に対して、複数に分割されていてもよい。
<Auxiliary formwork member>
As shown in FIG. 1, the auxiliary formwork member attached to the outer peripheral surface of the formwork member 40 includes a top end auxiliary formwork member 50a attached to the top end part and a side wall part auxiliary formwork member 50b attached to the side wall part. It can be divided roughly. The top end auxiliary mold member 50a and the side wall auxiliary mold member 50b are attached to the outer peripheral surface of the mold member 40 so as to correspond to the inner wall surface 20 having a radius larger than the minimum cross-section radius portion. It is a member for constructing 30. Note that the top end auxiliary mold member 50a and the side wall auxiliary mold member 50b may be divided into a plurality of pieces in the length direction (tunnel extension direction) of the tunnel covering formwork device 10.

天端部に取り付ける天端部補助型枠部材50aは、図2に示すように、ロール加工したH鋼等で枠組52を製作し、当該枠組52の外周面に薄板状の金属シート90を展張りして形成する。また、側壁部に取り付ける側壁部補助型枠部材50bは、図1及び図5に示すように、アーチ形状の両下端部から天端部補助型枠部材50aへ向かって、複数に分割された発泡プラスチック材を積み上げ、各発泡プラスチック材に設けた挿通孔51に結束部材70(例えば、太さ3mmの鋼製ワイヤー)を挿通して組み付ける。   As shown in FIG. 2, the top end auxiliary form frame member 50 a attached to the top end portion is made of a rolled H steel or the like, and a thin metal sheet 90 is spread on the outer peripheral surface of the frame 52. Stretch to form. Moreover, the side wall part auxiliary | assistant form frame member 50b attached to a side wall part is the foam divided | segmented into plurality from the both arch-shaped lower end parts toward the top end auxiliary form frame member 50a, as shown in FIG.1 and FIG.5. The plastic material is stacked, and the bundling member 70 (for example, a steel wire having a thickness of 3 mm) is inserted and assembled into the insertion hole 51 provided in each foamed plastic material.

そして、側壁部補助型枠部材50bが天端部補助型枠部材50aまで到達したら、両下端部から延びてきた結束部材70を天端部補助型枠部材50aの枠組52に取り付けて、型枠部材40の外周面に側壁部補助型枠部材50bを固定する。なお、結束部材70は鋼製ワイヤーに限定されず、側壁部補助型枠部材50bの厚み、大きさ、強度、覆工部材30の充填圧力等、側壁部補助型枠部材50bを施工する環境に応じて、適宜な部材を使用することができ、例えば、ポリプロピレン製の紐状部材を用いることもできる。   When the side wall auxiliary mold member 50b reaches the top end auxiliary mold member 50a, the bundling members 70 extending from both lower ends are attached to the frame 52 of the top end auxiliary mold member 50a to form the mold. The side wall auxiliary mold member 50 b is fixed to the outer peripheral surface of the member 40. The bundling member 70 is not limited to a steel wire, and the environment in which the side wall auxiliary mold member 50b is constructed, such as the thickness, size, strength of the side wall auxiliary mold member 50b, the filling pressure of the lining member 30, and the like. Accordingly, an appropriate member can be used. For example, a polypropylene string member can be used.

また、側壁部補助型枠部材50bは発泡プラスチック材で形成されているため、挿通孔51の補強が必要となる場合がある。このため、図5に示すように、挿通孔51内に、可撓性を有するパイプ53を挿入することが好ましい。このパイプ53は、例えば、可撓性を有する塩化ビニル等により形成されており、挿通孔51の曲がりに沿って挿入することができる。なお、パイプ53は、側壁部補助型枠部材50bを一連に組み付けて固定した後に、挿通孔51内に挿入する。これにより、挿通孔51の内壁を補強すると共に、結束部材70を容易に挿通することが可能となる。   Moreover, since the side wall part auxiliary | assistant form member 50b is formed with the foaming plastic material, reinforcement of the insertion hole 51 may be needed. For this reason, it is preferable to insert a flexible pipe 53 into the insertion hole 51 as shown in FIG. The pipe 53 is made of, for example, flexible vinyl chloride, and can be inserted along the bending of the insertion hole 51. The pipe 53 is inserted into the insertion hole 51 after the side wall portion auxiliary form member 50b is assembled and fixed in series. As a result, the inner wall of the insertion hole 51 can be reinforced and the binding member 70 can be easily inserted.

上述したように、天端部補助型枠部材50aは、例えば、ロール加工したH型鋼を組み付けて枠組52を形成し、当該枠組52の外周面に薄板状の金属シート90を展張りして形成している。一方、側壁部補助型枠部材50bは、発泡プラスチック材で形成している。したがって、覆工部材30の充填圧力が大きくなる可能性が高い天端部において十分な強度を確保することができる。さらに、側壁部では成型が容易で軽量な発泡プラスチック材を使用しているため、手間とコストを低減することができる。   As described above, the top end auxiliary mold frame member 50a is formed by, for example, assembling rolled H-shaped steel to form the frame assembly 52, and spreading a thin metal sheet 90 on the outer peripheral surface of the frame assembly 52. doing. On the other hand, the side wall auxiliary mold member 50b is formed of a foamed plastic material. Therefore, sufficient strength can be secured at the top end where the filling pressure of the lining member 30 is likely to increase. Furthermore, since the foamed plastic material that is easy to mold and lightweight is used in the side wall portion, labor and cost can be reduced.

なお、天端部において補助型枠部材の強度が要求されず、側壁部と同様の強度でよい場合には、すべての補助型枠部材を側壁部補助型枠部材50bと同様に、発泡プラスチック材で形成してもよい。この場合には、下部支承部41により最下部の補助型枠部材を下側から支持すると共に、両端部支承部42により補助型枠部材50の前後両端部を支持する。そして、アーチ形状の両下端部から天端(上方)へ向かって、複数に分割された補助型枠部材を積み上げながら、各補助型枠部材に設けた挿通孔51に結束部材70を挿通する。両下端部から積み上げた補助型枠部材が天端まで到達したら、両下端部から延びてきた結束部材70を結合し、いずれか一方の下端部において結束部材70を締め上げることにより、型枠部材40の外周面に補助型枠部材を固定することができる。   In addition, when the strength of the auxiliary mold member is not required at the top end portion and the strength is the same as that of the side wall portion, all the auxiliary mold member is made of the foamed plastic material in the same manner as the side wall portion auxiliary mold member 50b. May be formed. In this case, the lowermost support part frame member 41 supports the lowermost auxiliary formwork member from the lower side, and both end part support parts 42 support the front and rear end parts of the auxiliary formwork member 50. Then, the bundling member 70 is inserted into the insertion holes 51 provided in each auxiliary mold member while stacking the auxiliary mold members divided into a plurality from the lower ends of the arch shape toward the top (upward). When the auxiliary formwork members stacked from both lower ends reach the top end, the binding members 70 extending from both lower ends are joined, and the binding members 70 are tightened at either one of the lower ends, thereby forming the formwork members. The auxiliary mold member can be fixed to the outer peripheral surface of 40.

本実施形態の補助型枠部材(天端部補助型枠部材50a及び側壁部補助型枠部材50b)は、例えば30cm程度の厚みを有しており、型枠部材40の外周面に取り付けることにより、トンネルの断面半径が最小断面半径部分よりも大きな部分においても、同一のトンネル覆工用型枠装置10を用いて覆工部材30を施工することができる。   The auxiliary mold member (the top end auxiliary mold member 50a and the side wall auxiliary mold member 50b) of the present embodiment has a thickness of about 30 cm, for example, and is attached to the outer peripheral surface of the mold member 40. Even in a portion where the cross-sectional radius of the tunnel is larger than the minimum cross-sectional radius portion, the lining member 30 can be constructed using the same tunnel lining formwork device 10.

<補助型枠部材の外周面>
また、図1に示すように、天端部補助型枠部材50aの外周面には薄板状の金属シート90が展張りされており、側壁部補助型枠部材50bの外周面には防水シート80が展張りされている。この金属シート90及び防水シート80により、天端部補助型枠部材50a及び側壁部補助型枠部材50bの隙間にコンクリート等の覆工部材30が浸入することがなくなり、覆工の品質及び外観を向上させることができる。
<Outer peripheral surface of auxiliary formwork member>
Further, as shown in FIG. 1, a thin metal sheet 90 is spread on the outer peripheral surface of the top end auxiliary mold member 50a, and a waterproof sheet 80 is provided on the outer peripheral surface of the side wall auxiliary mold member 50b. Are spread out. The metal sheet 90 and the waterproof sheet 80 prevent the lining member 30 such as concrete from entering the gap between the top edge auxiliary mold member 50a and the side wall auxiliary mold member 50b, thereby improving the quality and appearance of the lining. Can be improved.

また、側壁部補助型枠部材50bの外周面に防水シート80を展張りした場合には、充填材との剥離等により側壁部補助型枠部材50bの表面に傷が付いたり、側壁部補助型枠部材50bが損壊したりすることがない。すなわち、防水シート80により側壁部補助型枠部材50bの表面を保護して、側壁部補助型枠部材50bを他の施工箇所へ転用することが可能となる。   Further, when the waterproof sheet 80 is spread on the outer peripheral surface of the side wall auxiliary mold member 50b, the surface of the side wall auxiliary mold member 50b may be damaged due to peeling from the filler or the like. The frame member 50b is not damaged. That is, it becomes possible to protect the surface of the side wall portion auxiliary mold member 50b with the waterproof sheet 80 and divert the side wall portion auxiliary mold member 50b to another construction location.

<トンネル覆工用型枠装置の応用例>
本実施形態のトンネル覆工用型枠装置10は、トンネルの2次覆工に使用できることは勿論であるが、この他に、1次覆工(トンネル地山へのコンクリート吹き付け)を施工した後に、1次覆工の内周面に防水シート(図示せず)を施工し、当該防水シートと1次覆工との間に充填材を注入する際にも使用することができる。
<Application example of formwork device for tunnel lining>
The tunnel lining formwork device 10 of this embodiment can be used for secondary lining of a tunnel, but in addition to this, after constructing a primary lining (concrete spraying on a tunnel ground) It can also be used when a waterproof sheet (not shown) is constructed on the inner peripheral surface of the primary lining and a filler is injected between the waterproof sheet and the primary lining.

一般的な防水シートの展張り方法では、防水シートが弛んでしまい、1次覆工の内周面と防水シートとの間に空隙が残ることがある。このため、空隙部分に地下水が溜まり易く、また、地下水が凍結することにより防水シートが破損するおそれがある。このような不都合に対処するため、防水シートの平滑化施工法が開発されている。防水シートの平滑化施工法は、移動式型枠を用いて防水シートと1次覆工との間に充填材を充填するものであり、特許第4044719号公報に詳細に記載されている。   In a general method of spreading a waterproof sheet, the waterproof sheet may be loosened and a gap may remain between the inner peripheral surface of the primary lining and the waterproof sheet. For this reason, groundwater tends to accumulate in the void portion, and the waterproof sheet may be damaged due to freezing of the groundwater. In order to cope with such inconveniences, a method for smoothing the waterproof sheet has been developed. The smoothing method of the waterproof sheet is to fill the filler between the waterproof sheet and the primary lining using a movable mold, and is described in detail in Japanese Patent No. 4044719.

10 トンネル覆工用型枠装置
11 台車
20 内壁面
30 覆工部材
40 型枠部材
41 下部支承部
42 両端部支承部
50a 天端部補助型枠部材
50b 側壁部補助型枠部材
51 挿通孔
52 枠組
53 パイプ
60 レール
70 結束部材
80 防水シート
90 金属シート
DESCRIPTION OF SYMBOLS 10 Formwork apparatus for tunnel lining 11 Carriage 20 Inner wall surface 30 Covering member 40 Formwork member 41 Lower support part 42 Both-ends support part 50a Top part auxiliary form frame member 50b Side wall part auxiliary form member 51 Insertion hole 52 Frame assembly 53 Pipe 60 Rail 70 Bundling member 80 Waterproof sheet 90 Metal sheet

Claims (5)

延長方向で断面半径が異なるトンネルの内壁面に覆工部材を施工するための型枠装置であって、
前記トンネルの延長方向に移動可能な台車上に設けられ、前記トンネルの最小断面半径部分の内壁面に対応させて覆工部材を施工するための型枠部材と、
前記型枠部材の外周面に取り付けることにより、前記最小断面半径部分よりも半径が大きな内壁面に対応させて覆工部材を施工するための補助型枠部材と、
を備えたことを特徴とするトンネル覆工用型枠装置。
A formwork device for constructing a lining member on the inner wall surface of a tunnel having a different cross-sectional radius in the extending direction,
Formed on a carriage movable in the direction of extension of the tunnel, a formwork member for constructing a lining member corresponding to the inner wall surface of the minimum cross-sectional radius portion of the tunnel,
By attaching to the outer peripheral surface of the formwork member, an auxiliary formwork member for constructing a lining member corresponding to the inner wall surface having a larger radius than the minimum cross-sectional radius part,
A tunnel lining formwork apparatus characterized by comprising:
前記補助型枠部材は、鋼製の枠組の外周面に薄板状の金属シートを展張りして形成した天端部補助型枠部材と、発泡プラスチック材で形成した側壁部補助型枠部材とからなることを特徴とする請求項1に記載のトンネル覆工用型枠装置。   The auxiliary mold member comprises a top edge auxiliary mold member formed by spreading a thin metal sheet on the outer peripheral surface of a steel frame, and a side wall auxiliary mold member formed of a foamed plastic material. The formwork device for tunnel lining according to claim 1. 前記側壁部補助型枠部材は、前記トンネルの円周方向に沿って複数に分割されると共に、結束部材を挿通するための挿通孔を有する、
ことを特徴とする請求項2に記載のトンネル覆工用型枠装置。
The side wall portion auxiliary mold member is divided into a plurality along the circumferential direction of the tunnel and has an insertion hole for inserting the binding member.
The formwork device for tunnel lining according to claim 2 characterized by things.
前記側壁部補助型枠部材の外周面に、防水シートを展張りしたことを特徴とする請求項2又は3に記載のトンネル覆工用型枠装置。   The formwork device for tunnel lining according to claim 2 or 3, wherein a waterproof sheet is spread on the outer peripheral surface of the side wall auxiliary formwork member. 前記型枠部材には、円周方向の両下端部に、前記補助型枠部材を下側から支持するための下部支承部を設けると共に、
前記型枠部材の妻側両端部を前記トンネルの半径方向に拡大可能として、前記補助型枠部材の前後両端部を支持する両端部支承部を設けた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覆工用型枠装置。
The mold member is provided with lower support portions for supporting the auxiliary mold member from below at both lower ends in the circumferential direction,
5. The both ends of the formwork member can be enlarged in the radial direction of the tunnel, and both end support portions for supporting both front and rear ends of the auxiliary formwork member are provided. The formwork apparatus for tunnel lining according to any one of the above.
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