JP2019073920A - Method of removing ceiling form in center, and receiving working platform - Google Patents

Method of removing ceiling form in center, and receiving working platform Download PDF

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JP2019073920A
JP2019073920A JP2017201040A JP2017201040A JP2019073920A JP 2019073920 A JP2019073920 A JP 2019073920A JP 2017201040 A JP2017201040 A JP 2017201040A JP 2017201040 A JP2017201040 A JP 2017201040A JP 2019073920 A JP2019073920 A JP 2019073920A
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center
ceiling
formwork
receiving
moving
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JP6990088B2 (en
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正隆 近藤
Masataka Kondo
正隆 近藤
君 陳
Jun Chen
君 陳
勝之 小杉
Katsuyuki Kosugi
勝之 小杉
昭弘 藤本
Akihiro Fujimoto
昭弘 藤本
由規 中川
Yoshinori Nakagawa
由規 中川
晴紀 坂田
Haruki Sakata
晴紀 坂田
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Daiei Koki Kk
Taisei Corp
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Daiei Koki Kk
Taisei Corp
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Abstract

To secure the traffic space of vehicles inside a center even in the middle of the disassembling work period of the center.SOLUTION: On either the front or rear side of a center A, a receiving working platform B is provided which can be moved up and down in a manner that does not block the central traffic space, a disassembled ceiling form 21 is moved in the back and forth direction of the center A and transferred to the receiving working platform B, the receiving working platform B is lowered, a hanging space Y is secured above the ceiling form 21 placed on the receiving working platform B, and the ceiling form 21 is removed by a crane Z.SELECTED DRAWING: Figure 5

Description

本発明は、トンネル構築に用いるセントルを解体するにあたり、セントルを構成する天井型枠をトンネル内で撤去する方法および装置に関する。   The present invention relates to a method and apparatus for removing a ceiling formwork constituting a center in a tunnel when disassembling a center used for tunnel construction.

セントル（スライドセントルともいう。）は、トンネルの内周面にコンクリートを打設するための型枠を支持するための型枠支持装置である。
このセントルをトンネル内で解体する方法として、特許文献１に記載の方法がある。
特許文献１に記載の方法は、トンネル（１）の内周面（１ａ）に沿って配設される天井型枠（４）と両側面型枠とを備えたコンクリート打設用型枠を解体する際に、トンネルの底部（６）と支持台（７）との間に介設しておいた脚台（１６）を取り外し、昇降機構（１３）により支持台（７）で支持した天井型枠（４）を下動させている。
この方法によれば、トンネル内において、天井型枠（４）の上部にクレーンでの吊り降ろしが可能な空間を確保することができる。 Centle (also referred to as slide centre) is a formwork support device for supporting a formwork for placing concrete on the inner circumferential surface of a tunnel.
As a method of disassembling this center in a tunnel, there is a method described in Patent Document 1.
The method described in Patent Document 1 dismantles a concrete casting form provided with a ceiling form (4) disposed along the inner circumferential surface (1a) of the tunnel (1) and a side surface form. When carrying out, remove the footrest (16) interposed between the bottom (6) of the tunnel and the support (7) and support the ceiling type supported by the support (7) by the lifting mechanism (13) Lowering the frame (4).
According to this method, it is possible to secure a space in which the crane can be hung up and down in the upper part of the ceiling form (4) in the tunnel.

特開２００５−２８２０９６号公報Unexamined-Japanese-Patent No. 2005-228096

しかし、上記特許文献１に記載の方法では、支持台（７）の下降に伴ってセントル内部の空間も狭まってしまうため、セントルの解体作業が完了するまで車両の通行ができなくなる、という問題があった。   However, in the method described in Patent Document 1 above, the space inside the centle also narrows as the support base (7) descends, so there is a problem that the vehicle can not pass until the disassembly work of the centle is completed there were.

よって、本発明は、セントルの解体作業期間の途中であってもセントル内部の空間内で車両の通行を可能とする手段の提供を目的とするものである。   Therefore, an object of the present invention is to provide means for enabling the passage of vehicles in the space inside the center even during the dismantling work period of the center.

上記課題を解決すべくなされた本願の第１発明は、セントルを構成する天井型枠をトンネル坑内で撤去する方法であって、セントルの前後何れかの側に、セントルの通行空間を遮らない態様で昇降自在に構成した受け構台を配置し、（ａ）解体した天井型枠をセントルの前後方向に移動させて受け構台に載せ替える工程、（ｂ）受け構台を降下させて、受け構台に載せた天井型枠の上方に吊り空間を確保する工程、（ｃ）前記吊り空間を用いて前記天井型枠を吊り降ろして撤去する工程、を少なくとも含むことを特徴とする。
また、本願の第２発明は、前記第１発明において、前記受け構台をセントルに固定しておき、セントルを反力受け部とする天井型枠の牽引作業でもって、天井型枠を受け構台に載せ替えることを特徴とする。
また、本願の第３発明は、前記第１発明または第２発明においては、前記受け構台が、門形形状を呈してセントルの通行空間と連通可能な開口部を有する、脚部と、前記脚部に対して昇降自在に構成し、天井型枠を支持する支持台を有する、移動部と、を少なくとも具備し、前記移動部の昇降動作によって前記開口部を遮らない構造を呈していることを特徴とする。
また、本願の第４発明は、セントルの組立時または解体時にセントルの前後何れかの側に配置して、セントルとの間で天井型枠を移し変えるための受け構台であって、門形形状を呈してセントルの通行空間と連通可能な開口部を有する、脚部と、前記脚部に対して昇降自在に構成し、天井型枠を支持する支持台を有する、移動部と、を少なくとも具備し、前記移動部の昇降動作によって前記開口部を遮らない構造を呈していることを特徴とする。 The first invention of the present application made to solve the above-mentioned problems is a method of removing a ceiling formwork constituting a sentle in a tunnel pit, which does not obstruct the passage of the sentle on either side before or after the sentle. (A) moving the disassembled ceiling form in the fore-and-aft direction of the center and placing it on the receiving structure, (b) lowering the receiving structure and placing it on the receiving structure The method further comprises at least the step of securing a hanging space above the ceiling formwork, and (c) the step of suspending and removing the ceiling formwork using the hanging space.
Further, according to a second invention of the present application, according to the first invention, the ceiling formwork is received by the ceiling formwork by a work of pulling the ceiling formwork having the reception stand fixed to the centerle and the centle as a reaction force receiving portion. It is characterized by being replaced.
Further, according to a third invention of the present application, in the first invention or the second invention, the receiving gantry has a gate-like shape and has an opening capable of communicating with the passage space of the center, and the leg At least a moving unit configured to be movable up and down with respect to the unit and having a support for supporting the ceiling form, and having a structure that does not obstruct the opening by the raising and lowering operation of the moving unit It features.
The fourth invention of the present application is a receiving structure for transferring a ceiling formwork to and from the centle, which is disposed on either side of the centle at the time of assembling or disassembling of the centle, and has a portal shape And an opening portion capable of communicating with the passage space of the center, and a moving portion configured to be movable up and down with respect to the leg portion and having a support for supporting the ceiling formwork. And the movable portion is moved up and down so as not to obstruct the opening.

本発明によれば、以下に記載する効果を奏する。
（１）解体作業期間中の車両通行が可能となる。
昇降する受け構台に天井型枠を乗せ替えることにより、セントルを構成する天井型枠を支持する装置（型枠支持装置）の高さを変更することなく解体した天井型枠を撤去できるため、セントルの解体作業期間中であっても、セントル内の車両通行を維持できる。
（２）トンネル覆工を傷つけない。
セントルを反力受け部として天井型枠の移動を行うため、トンネルを反力受け部とするためのアンカー打設などが不要となる。 According to the present invention, the following effects can be obtained.
(1) Vehicle traffic during the dismantling period becomes possible.
By replacing the ceiling formwork with the receiving platform that moves up and down, the dismantled ceiling formwork can be removed without changing the height of the device (formwork support device) that supports the ceiling formwork that constitutes the centle. Vehicle traffic in the center can be maintained even during the dismantling of the vehicle.
(2) Do not damage the tunnel lining.
Since the ceiling formwork is moved using the center as a reaction force receiving portion, it is not necessary to set an anchor for setting the tunnel as a reaction force receiving portion.

セントルの構成を示す概略正面図。The schematic front view which shows the structure of a center. 受け構台の昇降イメージを示す概略正面図。The schematic front view which shows the raising / lowering image of a receiving structure. 天井型枠の撤去作業の開始状態を示す概略側面図。The schematic side view which shows the start state of the removal operation of a ceiling formwork. 天井型枠の移動作業を示す概略側面図。The schematic side view which shows the movement operation of a ceiling formwork. 天井型枠の吊り降ろし作業を示す概略側面図。The schematic side view which shows the hanging-down operation | work of a ceiling formwork.

以下、図面を参照しながら、本発明の実施例について説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

＜１＞各装置の説明（図１，２）
まず始めに、図１，２を参照しながら、本発明に係る天井型枠の撤去方法で使用する装置（セントルＡ、受け構台Ｂ）の概要について説明する。 <1> Description of each device (Fig. 1, 2)
First, with reference to FIGS. 1 and 2, an outline of an apparatus (centle A, receiving structure B) used in the method for removing a ceiling form according to the present invention will be described.

＜２＞セントル（図１）
セントルＡは、トンネル内周面にコンクリート覆工を行うための装置である。セントルＡは公知の装置を用いることができる。
図１に示すセントルＡは、トンネル内を走行可能な型枠支持装置１０と、該型枠支持装置１０によってトンネル内周面に沿うように支持される型枠２０とからなる。 <2> Centle (Figure 1)
Centle A is a device for lining concrete on the inner surface of the tunnel. The center A can use a known device.
The center A shown in FIG. 1 comprises a mold supporting device 10 capable of traveling in a tunnel, and a mold 20 supported by the mold supporting device 10 along the inner circumferential surface of the tunnel.

＜２．１＞型枠支持装置
型枠支持装置１０は、トンネル内で型枠２０を支持するための装置である。
型枠支持装置１０は、型枠２０の支持部材を設けた態様でトンネル内を走行可能な台車である。 <2.1> Formwork Support Device The formwork support device 10 is a device for supporting the formwork 20 in a tunnel.
The form supporting device 10 is a carriage capable of traveling in the tunnel in a mode in which a supporting member of the form 20 is provided.

＜２．１．１＞通行空間
型枠支持装置１０は、門型形状を呈することで、セントルＡの前後に連通する通行空間Ａ１を設けている。この通行空間Ａ１でもって車両Ｘ等の往来を可能としている。 <2.1.1> Passage space The formwork support device 10 has a passage shape A1 communicating with the front and back of the center A by having a portal shape. The traffic space A1 enables traffic of the vehicle X and the like.

＜２．１．２＞型枠の位置決め部材
型枠支持装置１０には、後述する天井型枠２１や側面型枠２２を支持するための位置決め部材（中間支柱１１、側方支柱１２、台梁１３、横支柱１４）などを設けている。
これらの位置決め部材の数、配置場所等は、本発明において特段限定するものではない。 <2.1.2> Positioning member of formwork In the formwork supporting device 10, a positioning member for supporting a ceiling formwork 21 and a side formwork 22 which will be described later (intermediate column 11, side column 12, beam) 13, horizontal columns 14) and the like are provided.
The number of the positioning members, the arrangement location and the like are not particularly limited in the present invention.

＜２．２＞型枠（天井型枠・側面型枠）
型枠２０は、トンネルの天端部分を構成するための天井型枠２１と、トンネルの側壁部分を構成するための側面型枠２２とからなり、これらを互いに一体化した構成している。
天井型枠２１は、前記した中間支柱１１、側方支柱１２、台梁１３などによって支持されており、これらの部材についてシリンダ等による伸縮機構を設けておけば、天井型枠２１の位置を微調整することができる。
側面型枠２２も同様に、型枠支持装置１０から延びる、横支柱１４によって位置決めされている。 <2.2> formwork (ceiling formwork, side formwork)
The mold 20 comprises a ceiling mold 21 for forming the top end portion of the tunnel and a side mold 22 for forming the side wall portion of the tunnel, and these are integrated with each other.
The ceiling formwork 21 is supported by the above-mentioned intermediate column 11, side column 12, beam 13, etc. If a telescopic mechanism by a cylinder or the like is provided for these members, the position of the ceiling formwork 21 can be finely It can be adjusted.
The side formwork 22 is likewise positioned by means of a lateral support 14 which extends from the formwork support device 10.

＜３＞受け構台（図２）
受け構台Ｂは、天井型枠２１を撤去するにあたり、セントルＡから天井型枠２１を載せ替えるための装置である。
受け構台Ｂは、セントルＡの通行空間Ａ１を妨げない態様で上下に伸縮可能な受け構台Ｂを少なくとも備える。
受け構台Ｂは、解体した天井型枠２１を載せて降下することにより、該天井型枠２１の上方に吊り空間を確保するための装置である。
図２に、受け構台Ｂの概略図を示す。
受け構台Ｂは、地面に設置する脚部３０と、該脚部３０に対して上下に昇降自在に設けてある移動部４０とを少なくとも具備する。 <3> Receiving frame (Fig. 2)
The receiving table B is a device for replacing the ceiling form 21 from the center A when removing the ceiling form 21.
The receiving stand B includes at least a receiving stand B which can be expanded and contracted in the vertical direction in a manner not to disturb the passage space A1 of the center A.
The receiving table B is a device for securing a hanging space above the ceiling form 21 by placing the dropped ceiling form 21 and lowering it.
FIG. 2 shows a schematic view of the receiving gantry B. As shown in FIG.
The receiving structure B comprises at least a leg 30 installed on the ground, and a moving part 40 provided so as to be vertically movable up and down with respect to the leg 30.

＜３．１＞脚部
脚部３０は、受け構台Ｂの土台部分となる部材である。
脚部３０は、トンネルの横断面視上、門形形状を呈し、中央にセントルＡの通行空間Ａ１を走行する車両Ｘの通行を妨げない程度の大きさの開口部３１を有する。その他、脚部３０には移動部４０を昇降するための昇降装置（図示せず）を取り付けておく。 <3.1> Leg part The leg part 30 is a member which becomes a base part of the reception stand B.
The leg portion 30 has a gate-like shape in a cross-sectional view of the tunnel, and has an opening 31 having a size that does not hinder the passage of the vehicle X traveling in the passage space A1 of the center A at the center. In addition, a lifting device (not shown) for lifting and lowering the moving unit 40 is attached to the leg 30.

＜３．２＞移動部
移動部４０は、天井型枠２１を載置した状態で、前記脚部３０に取り付けた昇降装置（図示せず）の動作によって上下に昇降動作を行うための部材である。 <3.2> Moving Unit The moving unit 40 is a member for vertically moving up and down by the operation of a lifting device (not shown) attached to the leg 30 while the ceiling mold 21 is placed. is there.

＜３．２．１＞支持台
移動部４０を構成するフレームの両側には、外側に向かって突出するように支持台４１を設けている。
この支持台４１に、天井型枠２１から下方に延びる側方支柱１２を載せて支持することで、天井型枠２１を移動部４０に載置することができる。 <3.2.1> Support stand The support stand 41 is provided in the both sides of the flame | frame which comprises the movement part 40 so that it may protrude toward the outer side.
The ceiling mold 21 can be mounted on the moving section 40 by supporting the side support 12 extending downward from the ceiling mold 21 on the support base 41.

＜３．２．２＞脚部の開口部との関係
移動部４０は、自身の昇降動作によって前記脚部３０の開口部３１を遮らない形状とする。本実施例では、移動部４０を脚部３０とほぼ等幅の門形形状を呈する部材で構成しているため、移動部４０の昇降動作によって、移動部４０の構成部材が脚部３０の開口部３１内に留まることは無い。 <3.2.2> Relationship with Openings of Legs The moving unit 40 is shaped so as not to interrupt the openings 31 of the legs 30 by its own lifting operation. In this embodiment, since the moving unit 40 is formed of a member having a substantially equal width gate shape with the leg unit 30, the component of the moving unit 40 is an opening of the leg unit 30 by the raising and lowering operation of the moving unit 40. There is no need to stay in section 31.

＜３．３＞牽引部（図４）
さらに、受け構台Ｂには、着脱自在な牽引部５０を設ける。
牽引部５０は、解体した天井型枠２１をセントルＡから受け構台Ｂに載せ替えるための機能を少なくとも実現するための装置である。
牽引部５０は、受け構台Ｂに予め取り付けてある構成でも、任意に着脱自在な構成の何れであっても良い。
本実施例では、牽引部５０にチェーンブロックを用いており、チェーンブロックの一方を移動部４０に連結し、他方を対象の天井型枠２１に連結している。この状態でチェーンの巻き取り動作を行うことで、天井型枠２１を移動部４０側に引き寄せ可能としている。 <3.3> Traction section (Figure 4)
Furthermore, the receiving gantry B is provided with a detachable pulling unit 50.
The towing unit 50 is a device for realizing at least a function for transferring the disassembled ceiling form 21 from the center A to the receiving stand B.
The pulling unit 50 may be configured to be attached in advance to the receiving gantry B, or may be configured to be freely detachable.
In this embodiment, a chain block is used as the pulling unit 50, one of the chain blocks is connected to the moving unit 40, and the other is connected to the target ceiling form 21. By performing the winding operation of the chain in this state, the ceiling mold 21 can be drawn to the moving unit 40 side.

＜３．３．１＞牽引部による横引き
なお、牽引部５０は、受け構台Ｂへの載せ替え作業だけでなく、解体した天井型枠２１を受け構台Ｂの近くまで横引きするための装置として使用してもよい。 <3.3.1> Horizontal Pulling by Tow Unit The tow unit 50 is not only a transfer operation to the receiving unit B, but also a device for horizontally pulling the disassembled ceiling form 21 close to the receiving unit B. It may be used as

＜３．４＞その他の部材（図示せず）
その他、受け構台Ｂには、作業員の落下や、作業員が脚部３０や昇降装置の動作に巻き込まれることを防止するための、親綱や安全柵などを適宜設けておくことが好ましい。 <3.4> Other members (not shown)
In addition, it is preferable that the support structure B be appropriately provided with a main rope, a safety fence, and the like for preventing a worker from falling and being caught in the operation of the leg 30 and the lifting device.

＜４＞解体例（図３〜図５）
次に、本発明に係るセントルＡの解体方法の手順の一例について説明する。 <4> Disassembly example (Figures 3-5)
Next, an example of the procedure of the disassembling method of the center A according to the present invention will be described.

＜４．１＞開始状態（図３）
図３に、本発明に係る解体方法の初期状態の概略側面図を示す。
図３は、型枠を構成する天井型枠２１および側面型枠２２のうち、既に側面型枠２２が撤去されている状態である。
また、セントルＡの後方から張り出した足場についても撤去を行うことで、本発明に係る受け構台Ｂを型枠支持装置１０に接近させた状態で配置している。
そして、受け構台Ｂは、連結具６０を介してセントルＡと連結している。
この状態からの天井型枠２１の撤去手順を以下に説明する。 <4.1> Start status (Figure 3)
FIG. 3 shows a schematic side view of an initial state of the disassembling method according to the present invention.
FIG. 3 shows a state in which the side form 22 has already been removed among the ceiling form 21 and the side form 22 constituting the form.
In addition, by removing the scaffold projecting from the rear of the center A, the cradle B according to the present invention is disposed in a state in which it is brought close to the mold supporting device 10.
The receiving stand B is connected to the center A via the connecting tool 60.
The removal procedure of the ceiling formwork 21 from this state will be described below.

＜４．２＞天井型枠の解体・横引き・載せ替え（図４）
天井型枠２１は、トンネルの前後方向に向かって複数連結して構成しているため、受け構台Ｂを配置した側から順に一枚ずつ解体を行う。
まず、天井型枠２１を支持している支柱のうち、中央付近に位置する支柱（中間支柱１１）は、天井型枠２１と型枠支持装置１０の双方から切り離して解体する。解体した中間支柱１１はセントルの作業床に仮置きしておく。
また、天井型枠２１の側方を支持する側方支柱１２は、型枠支持装置１０側との連結を解除し、天井型枠２１に固定したままとする。
さらに、天井型枠２１の下縁付近を支持する台梁１３は、天井型枠２１との接触部付近を切断して、天井型枠２１の牽引または横引き作業に干渉しない場所に仮置きしておく。 <4.2> Dismantling / horizontal pulling / reloading of ceiling formwork (Fig. 4)
Since a plurality of ceiling forms 21 are connected in the longitudinal direction of the tunnel, they are disassembled one by one in order from the side on which the receiving structure B is disposed.
First, among the columns supporting the ceiling form 21, the column (intermediate column 11) located near the center is separated from both the ceiling form 21 and the form support device 10 and disassembled. The dismantled intermediate column 11 is temporarily placed on the work floor of the center.
Further, the side support 12 supporting the side of the ceiling form 21 is released from the connection with the side of the form supporting device 10 and remains fixed to the ceiling form 21.
Furthermore, the joist 13 supporting near the lower edge of the ceiling formwork 21 cuts near the contact portion with the ceiling formwork 21 and temporarily places it in a place that does not interfere with the pulling or lateral pulling operation of the ceiling formwork 21. Keep it.

＜４．３＞天井型枠の牽引（図４）
解体した天井型枠２１は、受け構台Ｂに設けた牽引部５０を用いて受け構台Ｂ側に引き寄せて載せ替え作業を行う。
図４に示す牽引部５０はチェーンブロックであり、チェーンブロックの一方を移動部４０に連結し、他方を対象の天井型枠２１に連結する。
この状態でチェーンの巻き取り動作を行うことで、天井型枠２１をセントルＡから移動部４０まで牽引している。
このとき、受け構台Ｂは、連結具６０を介してセントルＡと連結しているため、天井型枠２１の牽引作業の際にセントルＡが反力受け部となる。
よって、トンネルを反力受け部とするためのアンカー打設が不要となる。 <4.3> Towing ceiling formwork (Figure 4)
The disassembled ceiling form 21 is pulled to the receiving structure B side using the tow unit 50 provided on the receiving structure B to perform the loading operation.
The tow portion 50 shown in FIG. 4 is a chain block, and one side of the chain block is connected to the moving portion 40 and the other side is connected to the target ceiling form 21.
By performing the winding operation of the chain in this state, the ceiling form 21 is pulled from the center A to the moving part 40.
At this time, since the receiving structure B is connected to the center A via the connecting tool 60, the center A serves as a reaction force receiving portion when the ceiling form 21 is pulled.
Therefore, the anchor placement for making a tunnel a reaction force receiving part becomes unnecessary.

＜４．４＞天井型枠の下降・吊り降ろし（図５）
天井型枠２１を移動部４０に載せ替えたあとは、受け構台Ｂに設けた昇降手段を用いて、移動部４０を下降させる。
この下降作業によって、天井型枠２１の上方にクレーンＺのアームや吊り治具を差し入れ可能な空間（吊り空間Ｙ）を確保する。
吊り空間Ｙの確保後は、クレーンＺを用いて天井型枠２１を吊り降ろして撤去する。 <4.4> Lowering and hanging down the ceiling formwork (Figure 5)
After the ceiling form 21 is transferred to the moving part 40, the moving part 40 is lowered using the lifting means provided on the receiving structure B.
By this lowering operation, a space (a hanging space Y) in which the arm of the crane Z and the suspension jig can be inserted above the ceiling frame 21 is secured.
After securing the hanging space Y, the ceiling form 21 is suspended by using the crane Z and removed.

＜４．５＞繰り返し
前記＜４．２＞〜＜４．４＞までの手順を、順次繰り返して、天井型枠２１を１枚ずつ撤去していく。
なお、前記＜４．２＞〜＜４．４＞までの手順を、解体した各天井型枠２１に対して、矛盾のない範囲で並行実施しても良い。 <4.5> Repeating the procedure from <4.2> to <4.4> is sequentially repeated to remove the ceiling formwork 21 one by one.
In addition, you may carry out in parallel the procedure to said <4.2>-<4.4> in the range without contradiction with respect to each ceiling formwork 21 which was dismantled.

＜４．５．１＞離隔した天井型枠の横引き作業
受け構台Ｂから離れた位置に設置されていた天井型枠２１は、型枠支持装置１０の最後方近くまで横引きしてから、受け構台Ｂに設けた牽引部５０を用いて、天井型枠２１の載せ替え作業を行ってもよい。
この場合、型枠支持装置１０に別途設けてある昇降手段などを用いて、側方支柱１２と型枠支持装置１０との間に台車を設けておき、この台車によって型枠支持装置１０に存する部材をレールに見立てて、セントルＡの後端まで天井型枠２１を人力で押し出して横引きすればよい。 <4.5.1> Lateral pulling work of the ceiling formwork which has been separated The ceiling formwork 21 installed at a position distant from the receiving structure B is taken from the side of the formwork supporting apparatus 10 after being drawn to the side near the rear end, Using the pulling unit 50 provided in the receiving structure B, the work of transferring the ceiling form 21 may be performed.
In this case, a cart is provided between the side support 12 and the mold supporting apparatus 10 by using lifting and lowering means separately provided for the mold supporting apparatus 10, and the cart is provided with the mold supporting apparatus 10 by this cart. The member may be regarded as a rail, and the ceiling form 21 may be manually pushed out and laterally pulled up to the rear end of the center A.

＜４．６＞その後の作業（図示せず）
天井型枠２１を撤去した後は、受け構台Ｂを解体し、型枠支持装置１０とトンネル内周面との間の空間は確保されているため、適宜クレーンＺでセントルＡの構成部材（中間支柱１１、台梁１３など）を解体・撤去する。 <4.6> Subsequent work (not shown)
After removing the ceiling formwork 21, the receiving structure B is disassembled, and the space between the formwork supporting apparatus 10 and the inner circumferential surface of the tunnel is secured. Disassemble and remove the column 11, the joist 13, etc.).

＜５＞まとめ
このように、前記＜４．２＞〜＜４．４＞の手順において、型枠支持装置１０の高さを変えないまま天井型枠２１の解体・撤去が可能となる。
よって、解体作業中にセントルＡ内の車両Ｘの通行を要する場合であっても、解体作業を単に中断してクレーンＺなどを退避するだけで、セントルの通行空間Ａ１を使用できる。
したがって、夜間に解体作業を進め、昼間は解体作業を中断して車両通行を行い、夜間に解体作業を再開する、といった運用が可能となり、セントルＡの解体作業が完全に完了するまでの間、セントルＡ内の車両通行が全くできない状態を回避することができる。 <5> Summary As described above, the ceiling formwork 21 can be disassembled and removed without changing the height of the formwork supporting device 10 in the procedures of <4.2> to <4.4>.
Therefore, even if it is necessary to pass the vehicle X in the center A during the disassembling work, the traveling space A1 for the center can be used only by interrupting the disassembling work and evacuating the crane Z and the like.
Therefore, it is possible to proceed with dismantling work at night, interrupt dismantling work and carry on vehicles in the daytime, and resume dismantling work at night, until the dismantling work of Sentle A is completely completed. It is possible to avoid a situation in which vehicle traffic in the center A can not be done at all.

次に、本発明の第２実施例について説明する。
前記した実施例１で用いた受け構台は、トンネル坑内で、セントルの組立作業を行う際にも使用することができる（図示せず）。
基本的には、実施例１で説明した手順と逆の手順を行うことで、天井型枠を１枚ずつセントルに運搬して組立に供すればよい。
なお、天井型枠をセントル側に載せ替える際には、セントルに牽引部を設け、この牽引部でもって移動部に載せた天井型枠をセントル側に引き寄せればよい。 Next, a second embodiment of the present invention will be described.
The receiving table used in Example 1 described above can also be used when performing the assembly work of the center in the tunnel pit (not shown).
Basically, by carrying out a procedure reverse to the procedure described in the first embodiment, the ceiling formwork may be transported one by one to the center and provided for assembly.
In order to replace the ceiling formwork on the centle side, a pulling portion may be provided on the centerle, and the ceiling formwork placed on the moving portion may be pulled toward the centle side by this pulling portion.

Ａ セントル
Ａ１ 通行空間
１０ 型枠支持装置
１１ 中間支柱
１２ 側方支柱
１３ 台梁
１４ 横支柱
２０ 型枠
２１ 天井型枠
２２ 側面型枠
Ｂ 受け構台
３０ 脚部
３１ 開口部
４０ 移動部
４１ 支持台
５０ 牽引部
６０ 連結具
Ｘ 車両
Ｙ 吊り空間
Ｚ クレーン A Centle A1 Traffic space 10 Form support 11 Intermediate support 12 Side support 13 Beam 14 Horizontal support 20 Form 21 Ceiling form 22 Side form B B Receiving structure 30 Leg 31 Opening 40 Moving 40 Support 41 Traction part 60 connecting tool X vehicle Y suspension space Z crane

Claims (4)

セントルを構成する天井型枠をトンネル坑内で撤去する方法であって、
セントルの前後何れかの側に、セントルの通行空間を遮らない態様で昇降自在に構成した受け構台を配置し、
（ａ）解体した天井型枠をセントルの前後方向に移動させて受け構台に載せ替える工程、
（ｂ）受け構台を降下させて、受け構台に載せた天井型枠の上方に吊り空間を確保する工程、
（ｃ）前記吊り空間を用いて前記天井型枠を吊り降ろして撤去する工程、
を少なくとも含むことを特徴とする、
天井型枠の撤去方法。 A method of removing a ceiling formwork constituting a center in a tunnel pit,
Place a cradle on either side of the center, which can be moved up and down in a manner that does not block the passage space of the center,
(A) moving the disassembled ceiling form in the fore-and-aft direction of the center and replacing it on the receiving stand;
(B) lowering the receiving structure to secure a hanging space above the ceiling formwork mounted on the receiving structure;
(C) a step of suspending and removing the ceiling form using the suspended space;
At least including
How to remove the ceiling formwork. 前記受け構台をセントルに固定しておき、セントルを反力受け部とする天井型枠の牽引作業でもって、天井型枠を受け構台に載せ替えることを特徴とする、
請求項１に記載の天井型枠の撤去方法。 The receiving structure is fixed to the center, and the ceiling form is transferred to the receiving structure by pulling the ceiling form using the center as a reaction force receiving portion.
A method of removing a ceiling formwork according to claim 1. 前記受け構台が、
門形形状を呈してセントルの通行空間と連通可能な開口部を有する、脚部と、
前記脚部に対して昇降自在に構成し、天井型枠を支持する支持台を有する、移動部と、を少なくとも具備し、
前記移動部の昇降動作によって前記開口部を遮らない構造を呈していることを特徴とする、
請求項１または２に記載の天井型枠の撤去方法。 The receiving mechanism is
A leg having a gate-like shape and an opening capable of communicating with the passage space of the center,
At least a moving unit configured to be capable of moving up and down with respect to the legs and having a support for supporting a ceiling form;
It is characterized in that it has a structure that does not obstruct the opening by the raising and lowering operation of the moving unit,
The removal method of the ceiling formwork according to claim 1 or 2. セントルの組立時または解体時にセントルの前後何れかの側に配置して、セントルとの間で天井型枠を移し変えるための受け構台であって、
門形形状を呈してセントルの通行空間と連通可能な開口部を有する、脚部と、
前記脚部に対して昇降自在に構成し、天井型枠を支持する支持台を有する、移動部と、を少なくとも具備し、
前記移動部の昇降動作によって前記開口部を遮らない構造を呈していることを特徴とする、
受け構台。 A cradle which is placed on either side of the center of the center at the time of assembly or disassembly of the center and is used to transfer the ceiling formwork to and from the center,
A leg having a gate-like shape and an opening capable of communicating with the passage space of the center,
At least a moving unit configured to be capable of moving up and down with respect to the legs and having a support for supporting a ceiling form;
It is characterized in that it has a structure that does not obstruct the opening by the raising and lowering operation of the moving unit,
Reception stand.
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