JP4125068B2

JP4125068B2 - Temporary beams for reinforcing secondary lining panels

Info

Publication number: JP4125068B2
Application number: JP2002232611A
Authority: JP
Inventors: 啓行森島; 卓夫四宮; 郁男荻原; 澄子根城; 継志豊永; 義則高田
Original assignee: East Japan Railway Co
Current assignee: East Japan Railway Co
Priority date: 2002-08-09
Filing date: 2002-08-09
Publication date: 2008-07-23
Anticipated expiration: 2022-08-09
Also published as: JP2004068520A

Description

【０００１】
【発明の属する技術分野】
本発明は、例えばセグメントなどにより一次覆工された、主としてトンネル内壁を二次覆工する際に使用される二次覆工用パネルの裏面に二次覆工コンクリートを打設するため、前記二次覆工用パネルをその表面側から補強して支持するための仮設梁に関する。
【０００２】
【従来の技術】
従来から、一次覆工されたトンネルの漏水防止対策用などの目的で二次覆工を施すことが行われているが、二次覆工コンクリートを一次覆工面に打設するため、一次覆工面に適宜ピッチで取付けたＨ型鋼などによる支保工に、打設される二次覆工コンクリート用の型枠を兼用して二次覆工外面としてトンネル内に残る二次覆工用パネルを取付け、このパネルの裏面に二次覆工コンクリートを打設することが行われている。なお、このような二次覆工はトンネルに限られず一次覆工された壁面などの構築物に施工されることがあるので、本発明はトンネル以外の構築物の二次覆工に適用できる。
【０００３】
上記の二次覆工においては、二次覆工用の型枠となるパネルを現場で支保工に取付ける作業に時間がかかり、結果として工事期間が長期化してしまうという難点があった。その理由は、支保工に型枠となるパネルをボルト止めしたり、当該パネルが二次覆工用コンクリートの打設によってトンネル内面側に膨出することを防ぐため、そのパネルの外面に仮設の押え梁部材を当てがいこの梁部材を支保工にボルト止めするのに時間がかかるほか、仮設の前記梁部材を支保工から取外すのにも、また手間と時間を要していたからである。
【０００４】
【発明が解決しようとする課題】
本発明は上記のようなトンネルなどの二次覆工に使用されるパネルを補強するための仮設梁部材の着脱形態に起因した問題点、即ち、支保工に対する取付けや取外しに手間と時間がかかるという難点を解消できる着脱構造を具備した、二次覆工用パネルの補強用の仮設梁を提供することをその課題とするものである。
【０００５】
【課題を解決するための手段】
上記課題を解決することを目的としてなされた二次覆工用パネルを補強して支持する本発明仮設梁の構成は、二次覆工用パネルの左右側部を支持している左右の支保工における支持辺間の距離と略同長に形成した梁部材の左右の両端部に、中間部が当該梁部材に軸止めされ、その軸より先端側が前記支持辺の裏面に係止される掛鉤部に形成され、かつ、前記軸より後端側がレバー部に形成された係止部材を、当該係止部材の回転により、前記掛鉤部が前記支持辺に係止，離脱させられると共に、離脱時に前記掛鉤部がコンクリート打設後の前記パネル表面側に旋回されるように設けたことを特徴とするものである。
【０００６】
本発明では、前記レバー部を回して係止部材の掛鉤部を支保工の支持辺の裏面に係止させた状態において、当該レバー部の旋回を阻止する拘束部材を、前記レバー部の旋回位置に対応させて設けた構成とする。
【０００７】
本発明において、上記梁部材に設けた左右の係止部材の掛鉤部を、既に取付けられている二次覆工用パネルを通して支保工の支持辺に係止させるため、当該支保工に先に装着されている二次覆工用パネルの前記掛鉤部に対応する部位に、その係止部材が旋回されて支保工の支持辺の裏側に入るための***を形成しなければならない。この***は、二次覆工コンクリートの打設完了後、仮設した上記梁部材を外した後に、エポキシ樹脂などの充填剤によって埋められる。
【０００８】
【発明の実施の形態】
次に本発明の実施の形態例について、図に拠り説明する。図１は本発明二次覆工用パネルと仮設梁を一次覆工されたトンネルに施工する状態の概略を示した斜視図、図２はパネル補強用の本発明仮設梁の配置状態を示す全体の平断面図、図３は図２におけるＡ部の拡大断面図、図４はパネル補強用の仮設梁の左側（図２のＡ部）における本発明仮設梁の取付第一段階の拡大平断面図、図５は図４に示した部位における仮設梁取付の第二段階の拡大平断面図、図６は仮設梁を除去した後の平断面図、図７は本発明仮設梁の別例の中間を省略した平面図である。
【０００９】
図１において、１は地山Ｅに構築されるトンネルの一次覆工として既に設置されているセグメント、２は前記セグメント１の外面に二次覆工を施工するため、当該セグメント１の外面に沿って設置した平断面Ｉ型鋼（Ｈ鋼を横向きに使う）による支保工で、支保工２の設置間隔は、二次覆工用の型枠を兼用する後述するパネル３の正面幅（左右幅）に見合ったスパンで設置される。2a，2bは前記支保工２において、当該支保工２の外側に向いた左右の支持辺である。
【００１０】
本発明仮設梁により補強，支持される二次覆工用パネル３としては、本出願人が先に特願２０００−１５６７６８として提案している漏水対策用不燃軽量板を使用することが好ましい。即ち、この不燃軽量板は、不燃性のプラスチック発泡体を芯材と、この芯材を不燃性の繊維強化プラスチック製の外皮材により包むようにして、トンネルの曲面に合せた曲面状に形成したものであるが、二次覆工用パネル３としては、上記例の不燃軽量板に限らず、他の材料，構造により形成された二次覆工用パネルであってもよい。
【００１１】
図２において、本発明二次覆工用パネル３は、左右の支保工２，２の芯々間の距離より少し小さ目の正面幅に形成されたものであり、その裏面に水平方向でほぼ等間隔に平行な３本のリブ状部材４を具備している。リブ状部材４の左，右両側には、左右の支保工２，２における対向した支持辺2a，2bのほぼ全幅（左右の長さ）をすべて嵌入できる大きさ（深さ）の切欠部4a，4bが、各支持辺2a，2bの左右の長さ（全幅）と厚さよりも少し大き目に形成されている。５は前記パネル３と一時覆工面のセグメント１の間に形成された二次覆工用コンクリートが打設される空間である。
【００１２】
上記パネル３は、その左，右の切欠部4a，4bにおいて、当該切欠部4a，4bの切欠形状を利用して左右の支保工２，２のそれぞれ互に対向した２つの支持辺2a，2bに装着される。
【００１３】
ここでは、まず図２のパネル３の右側を、右側の支保工２の支持辺2bに対してリブ状部材４の右側の切欠部4bが対向するように位置付け、前記支持辺2bが切欠部4bに入ってしまうようにこのパネル３を押し付ける。
【００１４】
このようにしてパネル３における右側の切欠部4bに、右側の支保工４の支持辺2bが入り込んでしまうと、リブ状部材４における左側端は、左側の支保工２の支持辺2aに対して、切欠部4aが支持辺2aと同じレベルに位置する。つまり、パネル３の左側の裏面が支保工２の支持辺2aの前面に当るレベルに配置されることになるのである。そこで、パネル３を少し左側に平行にずらしてやると、左右のバネ5a，5bの作用により当該パネル３の左右側は、左右の支保工２，２の支持辺2a，2bに対してほぼ均等な位置関係で保持される。
【００１５】
上記のようにして、各支保工２に二次覆工用の本発明パネル３が装着されて一次覆工面（セグメント１）を覆うと、その一次覆工面と前記パネル３の裏面側の空間５に二次覆工用のコンクリートが裏打ちされるが、図２に示したパネル装着状態で打設すると、コンクリートの打設圧によりパネル３がトンネルの内部側に膨出するおそれがあるので、本発明では、各支保工２に装着されたパネル３を、同じ支保工２に仮設する本発明仮設梁６によって補強，支持する。この点について、図３〜図６を参照しつつ説明する。
【００１６】
図３〜図５に例示した本発明仮設梁６は、ここでは角型鋼管を用い、その左右側を手前側に向けて斜めにカットした平面から見て横長の逆台形状に形成したものを使用しているが、本発明ではこの仮設梁６の材質や形態は例示したものに限られるものではない。
【００１７】
本発明仮設梁６は、左，右両側端の斜めカット部位に、先端側が支保工２における支持辺2a，2bの裏面に回り込んで当該辺2a，2bを裏面から挟持する掛鉤部7aを有すると共に、該掛鉤部7aより後方部を軸８で梁６の壁面に軸止めし、かつ、該軸８より後方をレバー部7bに形成した係止部材７が、それぞれに取付けられている。
【００１８】
上記係止部材７は、その掛鉤部7aが支持辺2a，2bの裏面に回り込み、当該掛鉤部7aにおいて支保工２の支持辺2a又は2bを挟持するようにレバー部7bが軸８を中心に起立（図４から図５の状態に旋回変位）させられたとき、起立した当該レバー部7bをその起立位置に拘束するための環状の拘束部材９が、この仮設梁６の前面側の壁6aの外面に設けられている。なお、9aは拘束部材９の取付座、9bは拘束部材９の先端係止部である。
【００１９】
上記梁６における左右の係止部材７の掛鉤部7aを、支保工２に装着したパネル３の外面から支保工２の支持辺2a，2bの裏面側に通すには、当該パネル３の掛鉤部7aに対応部位に、その掛鉤部7aが挿通できる空間（穴）を要する。このため本発明では、各パネル３の左，右側において上記掛鉤部7aに対応する部位に、仮設穴3aを予め形成しておく。この穴3aの形態の一例は、掛鉤部7aの形態に対応して、図３，図４に例示するように先細のテーパ穴であるが、穴3aの形態はこれに限られず、任意である。
【００２０】
本発明では、上記構成を具備した本発明仮設梁６を、パネル３の一枚当り例えば２本〜３本程度、水平方向で平行にして当該パネル３の前面にほぼ等間隔で当てがい（図１，図２参照）、この状態で左，右の係止部材７のレバー部7bを起立させ、この状態を拘束部材９により保持する（図５参照）ことにより、当該左，右の係止部材７，７における掛鉤部7a，7aを左右の支保工２，２のそれぞれの支持辺2a，2bの裏面に回り込ませてそこに係止させることにより、各仮設梁６をパネル３の前面において支保工２に仮設するのである（図５参照）。
【００２１】
各支保工２に左，右側部において装着された各二次覆工用パネル３が、上記のようにして各仮設梁６により補強された時点で、前記各パネル３の裏面と一次覆工面の間の空間５に二次覆工コンクリートCoを打設して養生する。二次覆工コンクリートCoの打設，養生が終ると、仮設梁６を除去するのであるが、拘束部材９をレバー部7bから外し係止部材７を装着前の元の姿勢に戻すと、各仮設梁６は各パネル３の前面から取り外すことができるが、各係止部材７においてパネル３に設けた穴3aから二次覆工側に位置していた部分が取り除かれると、この部位には、コンクリートCoが打たれていないので空洞ｇが残ることとなる。そこで、本発明では、この空洞ｇの部分に、一例としてエポキシ樹脂などによる充填剤を詰めて固化させることにより、二次覆工を完了することとなる。
【００２２】
図３〜図５により説明した本発明仮設梁６には、図７に例示した別の形態のものがある。図７の本発明仮設梁６は、図３〜図５における仮設梁６とは係止部材７に設けた拘束部材９の形態が異なっている。即ち、図７の本発明仮設梁６では、その梁６の手前側の壁6aの内面にナット部材91aを設け、このナット部材91aに、係止部材７のレバー部7bに明けた長穴7cを通して座金付き頭部91bがストッパとして作用するボルト91cを螺合して成る拘束部材91が設けられている。
【００２３】
【発明の効果】
以上に説明したように、二次覆工用パネル補強用の本発明仮設梁は、支保工に対してボルト，ナットを一切用いることなく、型鋼などにより形成された支保工の支持辺に、いわばワンタッチ操作的に取付けることができるので、二次覆工用パネルを補強するための仮設梁を、至って省力的かつ容易な作業内容で取付け施工することが可能になる。
【００２４】
また、上記のように省力的かつ容易に取付けた本発明仮設梁は、その取付状態がボルト，ナット以外の部材であって、ワンタッチ操作、或は、簡易な操作による係止部材とその拘束部材を以て機械的に取付状態が拘束されるので、二次覆工コンクリートの打設時に当該仮設梁の取付けが外れるようなおそれは皆無である。
【００２５】
更に、上記のように堅固に取付けられた本発明仮設梁であっても、その取外しは前記係止部材を取付時とは逆方向に回転させる操作をするだけで、取外すことができるから、従来の支保工にボルト止めしていた仮設梁のように、その取外しに多くの労力と時間を要するという問題点を、ほぼ完璧といってよいレベルで解決することができる。
【図面の簡単な説明】
【図１】本発明二次覆工用パネルと仮設梁を一次覆工されたトンネルに施工する状態の概略を示した斜視図
【図２】パネル補強用の本発明仮設梁の配置状態を示す全体の平断面図
【図３】図２におけるＤ部の拡大断面図
【図４】パネル補強用の仮設梁の左側（図２のＡ部）における本発明仮設梁の取付第一段階の拡大平断面図
【図５】図４に示した部位における仮設梁取付の第二段階の拡大平断面図
【図６】仮設梁を除去した後の平断面図
【図７】本発明仮設梁の別例の中間を省略した平面図
【符号の説明】
１セグメント
２支保工
2a，2b 支持辺
３二次覆工用パネル
４リブ状部材
4a，4b 切欠部
６仮設梁
７係止部材
7a 掛鉤部
7b レバー部
８軸
９拘束部材[0001]
BACKGROUND OF THE INVENTION
In the present invention, for example, the secondary lining concrete is placed on the back surface of the secondary lining panel mainly used when secondary lining the inner wall of the tunnel, which is primarily laid by a segment or the like. The present invention relates to a temporary beam for reinforcing and supporting the next lining panel from the surface side.
[0002]
[Prior art]
Conventionally, secondary lining has been applied for the purpose of preventing leakage of primary lining tunnels, but the primary lining surface is used for placing secondary lining concrete on the primary lining surface. A secondary lining panel that remains in the tunnel as a secondary lining outer surface is attached to the support work with H-shaped steel, etc., which is attached at an appropriate pitch to the secondary lining concrete formwork. A secondary lining concrete is placed on the back surface of the panel. In addition, since such a secondary lining is not limited to a tunnel but may be applied to a structure such as a wall surface subjected to primary lining, the present invention can be applied to a secondary lining of a structure other than a tunnel.
[0003]
In the above-mentioned secondary lining, there is a problem that it takes time to attach a panel, which will be a mold for secondary lining, to a support on site, resulting in a prolonged construction period. The reason for this is that a panel that becomes a formwork is bolted to the support work, or the panel is temporarily placed on the outer surface of the panel in order to prevent the panel from bulging to the inner surface of the tunnel due to the placement of concrete for secondary lining. This is because it takes time to apply the presser beam member and to bolt the beam member to the support work, and it also takes time and effort to remove the temporary beam member from the support work.
[0004]
[Problems to be solved by the invention]
The present invention is a problem due to the attachment and detachment mode of the temporary beam member for reinforcing the panel used for the secondary lining such as the tunnel as described above, that is, it takes time and effort to attach and remove the support beam. It is an object of the present invention to provide a temporary beam for reinforcing a panel for secondary lining, which is equipped with a detachable structure that can eliminate the difficulty described above.
[0005]
[Means for Solving the Problems]
The structure of the temporary beam of the present invention that reinforces and supports the secondary lining panel made for the purpose of solving the above-mentioned problem is that the left and right supporters that support the left and right sides of the secondary lining panel At the left and right ends of the beam member formed approximately the same length as the distance between the support sides, the intermediate portion is fixed to the beam member, and the hook portion is locked to the back surface of the support side from the axis. It is formed on, and a locking member which the rear end side is formed in the lever portion from the front Kijiku, by rotation of the locking member, wherein the hanging hook is locked in the support side, with is is disengaged, during withdrawal The hanging portion is provided so as to be turned to the panel surface side after the concrete is placed.
[0006]
In the present invention, in the state in which the lever portion is turned and the hook portion of the locking member is locked to the back surface of the support side of the support work, the restraining member that prevents the lever portion from turning is the turning position of the lever portion. It is set as the structure provided corresponding to.
[0007]
In the present invention, the hooks of the left and right locking members provided on the beam member are locked to the support side of the support through the already installed secondary lining panel, so that the support is attached to the support first. A small hole for turning the locking member to enter the back side of the support side of the support work must be formed in a portion corresponding to the hanging portion of the secondary lining panel. The small hole is filled with a filler such as an epoxy resin after the temporary beam member is removed after the secondary lining concrete is placed.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an outline of a state in which a secondary lining panel of the present invention and a temporary beam are constructed in a primary-covered tunnel, and FIG. 2 is an overall view showing an arrangement state of the temporary beam of the present invention for panel reinforcement. FIG. 3 is an enlarged sectional view of part A in FIG. 2, and FIG. 4 is an enlarged sectional view of the first stage of mounting the temporary beam of the present invention on the left side (part A of FIG. 2) of the temporary beam for panel reinforcement. FIG. 5, FIG. 5 is an enlarged plan sectional view of the second stage of mounting the temporary beam at the site shown in FIG. 4, FIG. 6 is a plan sectional view after removing the temporary beam, and FIG. 7 is another example of the temporary beam of the present invention. It is the top view which abbreviate | omitted the middle.
[0009]
In FIG. 1, 1 is a segment that has already been installed as a primary lining for a tunnel built on natural ground E, 2 is along the outer surface of the segment 1 in order to construct a secondary lining on the outer surface of the segment 1 The installation interval of the support 2 is the width of the front of the panel 3, which will be described later, which also serves as the formwork for the secondary lining. It is installed with the span suitable for Reference numerals 2a and 2b denote left and right support sides facing the outside of the support work 2 in the support work 2.
[0010]
As the secondary lining panel 3 reinforced and supported by the temporary beam of the present invention, it is preferable to use a non-combustible lightweight board for water leakage countermeasures previously proposed by the present applicant as Japanese Patent Application No. 2000-156768. In other words, this incombustible lightweight board is formed in a curved shape that matches the curved surface of the tunnel so that the incombustible plastic foam is wrapped with a core material and the core material is wrapped with a nonflammable fiber-reinforced plastic outer skin material. However, the secondary lining panel 3 is not limited to the non-combustible lightweight board of the above example, but may be a secondary lining panel formed of other materials and structures.
[0011]
In FIG. 2, the secondary lining panel 3 of the present invention is formed to have a front width slightly smaller than the distance between the cores of the left and right supporters 2, 2, and on the back surface thereof is substantially equidistant in the horizontal direction. Are provided with three rib-like members 4 parallel to each other. On the left and right sides of the rib-like member 4, a notch 4a having a size (depth) that can fit almost the entire width (left and right lengths) of the opposing support sides 2a and 2b of the left and right supporters 2 and 2 is provided. , 4b are formed slightly larger than the left and right lengths (full widths) and thicknesses of the support sides 2a, 2b. 5 is a space in which the concrete for secondary lining formed between the panel 3 and the segment 1 of the temporary lining surface is placed.
[0012]
In the left and right cutouts 4a and 4b, the panel 3 has two support sides 2a and 2b opposed to each other of the left and right support works 2 and 2 by using the cutout shape of the cutouts 4a and 4b. It is attached to.
[0013]
Here, the right side of the panel 3 in FIG. 2 is first positioned so that the right notch 4b of the rib-like member 4 faces the support side 2b of the right support 2 and the support side 2b is the notch 4b. This panel 3 is pressed so that it may enter.
[0014]
In this way, when the support side 2b of the right support 4 is inserted into the right notch 4b of the panel 3, the left end of the rib-like member 4 is in relation to the support side 2a of the left support 2. The notch 4a is located at the same level as the support side 2a. In other words, the back surface on the left side of the panel 3 is disposed at a level where it hits the front surface of the support side 2 a of the support 2. Therefore, if the panel 3 is shifted slightly in parallel to the left side, the left and right sides of the panel 3 are substantially equal to the support sides 2a and 2b of the left and right supporters 2 and 2 by the action of the left and right springs 5a and 5b. Held in a positional relationship.
[0015]
As described above, when the present invention panel 3 for secondary lining is mounted on each support construction 2 to cover the primary lining surface (segment 1), the space 5 on the primary lining surface and the back side of the panel 3 is provided. The concrete for the secondary lining is lined with the concrete. However, if the panel is installed in the state shown in FIG. 2, the panel 3 may bulge to the inside of the tunnel due to the concrete placement pressure. In the present invention, the panels 3 attached to the respective supports 2 are reinforced and supported by the temporary beams 6 of the present invention that are temporarily installed on the same support 2. This point will be described with reference to FIGS.
[0016]
The temporary beam 6 of the present invention illustrated in FIG. 3 to FIG. 5 uses a square steel pipe and is formed in a horizontally inverted inverted trapezoidal shape as viewed from a plane that is obliquely cut with its left and right sides toward the near side. Although used, in the present invention, the material and form of the temporary beam 6 are not limited to those illustrated.
[0017]
The temporary beam 6 according to the present invention has hook portions 7a at the oblique cut portions on both the left and right side ends, with the tip side wrapping around the back surfaces of the support sides 2a and 2b of the support 2 and sandwiching the sides 2a and 2b from the back surface. In addition, a locking member 7 is attached to each of which the rear part from the hook part 7a is fixed to the wall surface of the beam 6 by the shaft 8 and the rear part from the shaft 8 is formed in the lever part 7b.
[0018]
As for the said locking member 7, the lever part 7b is centering on the axis | shaft 8 so that the hook part 7a may go around to the back surface of the support sides 2a and 2b, and the support side 2a or 2b of the support work 2 may be clamped in the said hook part 7a. An annular restraining member 9 for restraining the standing lever portion 7b to the standing position when it is erected (turned and displaced from the state shown in FIG. 4 to FIG. 5) is a wall 6a on the front side of the temporary beam 6. Is provided on the outer surface. Reference numeral 9a denotes a mounting seat for the restraining member 9, and 9b denotes a leading end locking portion of the restraining member 9.
[0019]
To pass the hanging portions 7a of the left and right locking members 7 in the beam 6 from the outer surface of the panel 3 attached to the support 2 to the back side of the support sides 2a, 2b of the support 2, the hanging portion of the panel 3 A space (hole) through which the hook portion 7a can be inserted is required at a portion corresponding to 7a. For this reason, in the present invention, the temporary holes 3a are formed in advance on the left and right sides of each panel 3 at portions corresponding to the hooking portions 7a. An example of the form of the hole 3a is a tapered tapered hole as illustrated in FIGS. 3 and 4 corresponding to the form of the hanging portion 7a, but the form of the hole 3a is not limited to this and is arbitrary. .
[0020]
In the present invention, the temporary beam 6 of the present invention having the above-described configuration is applied to the front surface of the panel 3 at approximately equal intervals in parallel in the horizontal direction, for example, about 2 to 3 per panel 3 (see FIG. 1, refer to FIG. 2). In this state, the lever portion 7b of the left and right engaging members 7 is erected, and this state is held by the restricting member 9 (see FIG. 5). By hanging the hanging portions 7a, 7a of the members 7, 7 around the back sides of the support sides 2a, 2b of the left and right supporters 2, 2, each temporary beam 6 is placed on the front surface of the panel 3. It is temporarily installed in the support work 2 (see FIG. 5).
[0021]
When the secondary lining panels 3 mounted on the left and right sides of the respective supports 2 are reinforced by the temporary beams 6 as described above, the back surface of each panel 3 and the primary lining surface The secondary lining concrete Co is placed in the space 5 between and cured. When the secondary lining concrete Co is placed and cured, the temporary beam 6 is removed. When the restraining member 9 is removed from the lever portion 7b and the locking member 7 is returned to the original posture before mounting, The temporary beam 6 can be removed from the front surface of each panel 3, but when the portion of the locking member 7 located on the secondary lining side is removed from the hole 3a provided in the panel 3, Since the concrete Co is not struck, the cavity g remains. Thus, in the present invention, the secondary lining is completed by filling the cavity g with a filler such as an epoxy resin as an example and solidifying it.
[0022]
The temporary beam 6 of the present invention described with reference to FIGS. 3 to 5 has another form illustrated in FIG. The temporary beam 6 of the present invention in FIG. 7 is different from the temporary beam 6 in FIGS. 3 to 5 in the form of a restraining member 9 provided on the locking member 7. That is, in the temporary beam 6 of the present invention shown in FIG. 7, a nut member 91a is provided on the inner surface of the front wall 6a of the beam 6, and a long hole 7c opened in the lever portion 7b of the locking member 7 is provided in the nut member 91a. A constraining member 91 is provided in which a head 91b with a washer is screwed with a bolt 91c acting as a stopper.
[0023]
【The invention's effect】
As described above, the temporary beam of the present invention for reinforcing the panel for secondary lining is, so to speak, on the support side of the support formed by a steel plate or the like without using any bolts and nuts for the support. Since it can be attached in a one-touch operation, a temporary beam for reinforcing the secondary lining panel can be attached and installed with labor-saving and easy work contents.
[0024]
In addition, the temporary beam of the present invention, which is labor-saving and easily attached as described above, is a member other than bolts and nuts in an attached state, and is a locking member and its restraining member by one-touch operation or simple operation. Thus, since the mounting state is mechanically restricted, there is no possibility that the temporary beam will be unattached when the secondary lining concrete is placed.
[0025]
Further, even the temporary beam of the present invention firmly attached as described above can be removed simply by rotating the locking member in the direction opposite to the direction of attachment. The problem of requiring a lot of labor and time for removing the temporary beam, such as a temporary beam that has been bolted to the support, can be solved at a level that is almost perfect.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an outline of a state in which a secondary lining panel of the present invention and a temporary beam are installed in a primary lining tunnel. FIG. 2 shows an arrangement state of the temporary beam of the present invention for panel reinforcement. Fig. 3 is an enlarged cross-sectional view of part D in Fig. 2. Fig. 4 is an enlarged plan view of the first stage of mounting the temporary beam of the present invention on the left side (A part of Fig. 2) of the temporary beam for panel reinforcement. Sectional view [Fig. 5] An enlarged plan sectional view of the second stage of the temporary beam attachment at the site shown in Fig. 4. [Fig. 6] Plan sectional view after removing the temporary beam. [Fig. 7] Another example of the temporary beam of the present invention Plan view with the middle omitted [Explanation of symbols]
1 Segment 2 Supporting work
2a, 2b Support side 3 Secondary lining panel 4 Rib-shaped member
4a, 4b Notch 6 Temporary beam 7 Locking member
7a Hanging part
7b Lever part 8 Shaft 9 Restraint member

Claims

二次覆工用パネルの左右側部を支持している左右の支保工における支持辺間の距離と略同長に形成した梁部材の左右の両端部に、中間部が当該梁部材に軸止めされ、その軸より先端側が前記支持辺の裏面に係止される掛鉤部に形成され、かつ、前記軸より後端側がレバー部に形成された係止部材を、当該係止部材の回転により、前記掛鉤部が前記支持辺に係止，離脱させられると共に、離脱時に前記掛鉤部がコンクリート打設後の前記パネル表面側に旋回されるように設けたことを特徴とする二次覆工用パネルの補強用仮設梁。At the left and right ends of the beam member formed to be approximately the same length as the distance between the support sides in the left and right support works supporting the left and right sides of the secondary lining panel, the middle part is fixed to the beam member. is formed in a hanging hook tip side of the shaft is locked on the rear surface of the support side, and, before the locking member the rear end side is formed in the lever portion from Kijiku, by rotation of the locking member The hooking portion is engaged with and released from the support side, and the hooking portion is provided so as to be turned to the panel surface side after the concrete is placed at the time of releasing. Temporary beam for reinforcing panels .

レバー部を回して係止部材の掛鉤部を支保工の支持辺の裏面に係止させた状態において、当該レバー部の旋回を阻止する拘束部材を、前記レバー部の旋回位置に対応させて設けた請求項１の二次覆工用パネルの補強用仮設梁。In a state where the lever portion is turned and the hook portion of the locking member is locked to the back surface of the support side of the support work, a restraining member that prevents the lever portion from turning is provided corresponding to the turning position of the lever portion. A temporary beam for reinforcing a secondary lining panel according to claim 1.