JP2012041719A - Blockout mold and construction method of blockout hole - Google Patents

Blockout mold and construction method of blockout hole Download PDF

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JP2012041719A
JP2012041719A JP2010183411A JP2010183411A JP2012041719A JP 2012041719 A JP2012041719 A JP 2012041719A JP 2010183411 A JP2010183411 A JP 2010183411A JP 2010183411 A JP2010183411 A JP 2010183411A JP 2012041719 A JP2012041719 A JP 2012041719A
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divided
mold
hole
molds
boxing
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JP5085698B2 (en
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Kazuya Hamamizu
一矢 濱水
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KOYO SHOJI KK
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Abstract

PROBLEM TO BE SOLVED: To provide a blockout mold capable of improving the finish of a blockout hole after removal, facilitating removal work, and being diverted for two or more times even though it is made of wood.SOLUTION: The blockout mold is used for molding a recessed blockout hole 13 on a concrete structure, and includes inner surface molding parts 18 and 20 for molding the inner surface of the blockout hole 13. The blockout mold 10 comprises a plurality of division molds 211-214 having a division inner surface molding part which is a part of the inner surface molding parts 18 and 20, and for the plurality of division molds 211-214, a removal order from the blockout hole 13 is determined. The division inner surface molding part of the respective division molds 211-214 has an abutting surface to be abutted to the division inner surface molding part of the other adjacent division molds 211-216, and the abutting surface is formed along a direction of separating the division inner surface molding part of the division mold whose removal order precedes among the adjacent division molds 211-214 from the inner surface of the blockout hole.

Description

本発明は、トンネル等のコンクリート構造物に凹状の箱抜き穴を成形するために用いられる箱抜き型枠及び箱抜き穴の施工方法に関するものである。   The present invention relates to a box forming frame used for forming a concave box opening hole in a concrete structure such as a tunnel and a method for constructing a box opening hole.

コンクリート構造物であるトンネルには、図16に示すように、非常電話、通報装置、消火器具等の各種設備を設置するための凹状の箱抜き穴313が形成されている。この箱抜き穴313は、例えば覆工コンクリート312の打設時に予め箱抜き型枠をセットしておくことによって覆工コンクリート312と同時に成形される(例えば、特許文献1参照)。   In the tunnel that is a concrete structure, as shown in FIG. 16, a concave box opening hole 313 for installing various facilities such as an emergency telephone, a notification device, and a fire extinguishing device is formed. The box opening hole 313 is formed at the same time as the lining concrete 312 by, for example, setting a box form in advance when placing the lining concrete 312 (see, for example, Patent Document 1).

また、箱抜き穴313を成形するために用いられる箱抜き型枠は、従来、鋼製のものや木製のものが用いられている。鋼製の箱抜き型枠は耐久性が高く、多数回の転用が可能であるが、製造コストが高く、重量物であるために運搬や設置が煩雑になるという欠点がある。これに対して木製の箱抜き型枠は、比較的安価に製造することができ、運搬や設置も容易に行うことが可能であるが、耐久性が低く、脱型時に1回きりの使用で取り壊してしまうのが一般的である。   In addition, conventionally, a boxed mold used for forming the boxed hole 313 is made of steel or wooden. Steel box-opening molds are highly durable and can be used many times, but they are expensive to manufacture and have the disadvantages of being heavy and difficult to transport and install. On the other hand, wooden box-shaped formwork can be manufactured relatively inexpensively and can be easily transported and installed, but has low durability and can be used only once during demolding. It is common to destroy them.

特開2000−110347号公報JP 2000-110347 A

トンネル内には、トンネルの延長が大きいほど、また交通量が多いほど、多種類の設備を設置することが要求され、その設置間隔も種類毎に定められている。そのため、大規模のトンネルでは多くの箱抜き穴を形成する必要があり、製造コストや設置の煩雑さ等の欠点を考慮したとしても、多数回の転用が可能な鋼製の箱抜き型枠を使用することが有益である。
一方、数回程度の箱抜き型枠の転用が要求される小規模のトンネルにおいて、鋼製の箱抜き型枠を使用することはその利点よりも欠点の方が顕著となるため、専ら、木製の箱抜き型枠が使用される。この場合、箱抜き穴の数に応じて複数個の木製の箱抜き型枠を予め準備しておき、1箇所の箱抜き穴につき1個の箱抜き型枠を使用しているのが現状である。
In the tunnel, as the length of the tunnel increases and the traffic volume increases, it is required to install various types of facilities, and the installation interval is determined for each type. Therefore, it is necessary to form many boxing holes in a large-scale tunnel, and even if the drawbacks such as manufacturing cost and installation complexity are taken into consideration, a steel boxing formwork that can be diverted many times is used. It is beneficial to use.
On the other hand, in small-scale tunnels that require diversion of boxing formwork several times, the use of steel boxing formwork is more conspicuous than its advantages. Boxing formwork is used. In this case, a plurality of wooden boxing molds are prepared in advance according to the number of boxing holes, and one boxing mold is used for each boxing hole. is there.

しかし、近年においては、工事費の削減や破壊された箱抜き型枠から生じる廃棄物の削減等の要請から、木製の箱抜き型枠においても数回の転用を可能にする試みがなされつつある。転用を可能にした従来の木製の箱抜き型枠の一例を図17に示す。
この箱抜き型枠310は複数個の分割型枠321を上下左右に間隔をあけて並べることによって構成されており、各分割型枠321の間には発泡スチロール351からなる板材が挿入されている。
However, in recent years, attempts have been made to enable diversion several times even for wooden boxing molds due to demands for reducing construction costs and waste generated from destroyed boxing molds. . FIG. 17 shows an example of a conventional wooden box-opening form that can be diverted.
The box-shaped mold 310 is configured by arranging a plurality of divided molds 321 vertically and horizontally and spaced from each other, and a plate material made of polystyrene foam 351 is inserted between the divided molds 321.

そして、この箱抜き型枠310の周囲にコンクリートを打設して硬化させた後、各分割型枠321を脱型するには、まず、分割型枠321の間から発泡スチロール351を取り外し、分割型枠321の間に隙間を形成する。そして、この隙間にバール等の工具を挿入しつつ、分割型枠321を隙間内で移動させることによって箱抜き穴313から各分割型枠321を取り外す。これにより、箱抜き型枠321自体は取り壊すことなく箱抜き穴313から脱型することができ、数回程度の転用であれば実用に耐え得るものであった。   And after putting concrete around this boxing mold 310 and making it harden | cure, in order to demold each division | segmentation mold 321, first, the polystyrene foam 351 is removed from between the division | segmentation molds 321, and division | segmentation type | molds are used. A gap is formed between the frames 321. Then, each divided mold 321 is removed from the box opening hole 313 by moving the divided mold 321 in the gap while inserting a tool such as a bar into the gap. As a result, the box-opening mold 321 itself can be removed from the box-opening hole 313 without being demolished, and can be practically used if it is diverted several times.

しかし、分割型枠321の間から発泡スチロール351を引き抜いた後に、箱抜き穴313の底面や内側面に発泡スチロール351の残留物が付着することがあり、成型後の箱抜き穴313の仕上がりが悪くなるという問題があった。また、発泡スチロール351は、コンクリートの硬化に伴う圧縮力を受けて分割型枠321の間から僅かに膨出し、この発泡スチロール351の膨出部分によって箱抜き穴313の底面や内側面には凹状の筋が形成されることがあり、これも箱抜き穴の仕上がりを悪化させる原因となっていた。   However, after the expanded polystyrene 351 is pulled out from between the divided molds 321, the residue of the expanded polystyrene 351 may adhere to the bottom surface or the inner surface of the box opening hole 313, and the finished box opening hole 313 after molding is deteriorated. There was a problem. Further, the polystyrene foam 351 receives a compressive force accompanying the hardening of the concrete and slightly bulges from between the divided molds 321. Due to the bulging portion of the polystyrene foam 351, the bottom surface and the inner surface of the box opening hole 313 have concave streaks. May be formed, which also causes the finish of the boxing hole to deteriorate.

本発明は、脱型後の箱抜き穴の仕上がりを悪化させることなく、容易に脱型作業を行うことができ、木製であっても複数回の転用が可能な箱抜き型枠及び箱抜き穴の施工方法を提供することを目的とする。   The present invention provides a boxing mold and a boxing hole that can be easily removed without deteriorating the finish of the boxing hole after demolding, and can be diverted multiple times even with wood. The purpose is to provide a construction method.

本発明は、コンクリート構造物に凹状の箱抜き穴を成形するために用いられ、当該箱抜き穴の内面を成形する内面成形部を有している箱抜き型枠であって、
当該箱抜き型枠は、前記内面成形部の一部である分割内面成形部を有する複数の分割型枠から構成され、
各分割型枠の分割内面成形部は、隣接する他の分割型枠の分割内面成形部に対して突き合わされる突き合わせ面を有しており、
複数の分割型枠は、前記箱抜き穴からの脱型順序が所定に定められ、
前記突き合わせ面は、隣接する分割型枠のうち脱型順序が先行する分割型枠の分割内面成形部を前記箱抜き穴の内面から離反させる方向に沿って形成されていることを特徴とする。
The present invention is a box forming mold used for forming a concave box opening hole in a concrete structure, and having an inner surface forming part for forming the inner surface of the box opening hole,
The boxing mold is composed of a plurality of divided molds having a divided inner surface molding part which is a part of the inner surface molding part,
The divided inner surface molding portion of each divided mold has a butting surface that is abutted against the divided inner surface molded portion of another adjacent divided mold frame,
The plurality of divided molds have a predetermined order of demolding from the box opening holes,
The abutting surface is formed along a direction in which a split inner surface forming portion of a split mold that precedes the demolding order among adjacent split molds is separated from the inner surface of the box opening hole.

この構成によれば、箱抜き型枠を構成する複数の分割型枠における分割内面成形部は、互いに隣接する他の分割型枠の分割内面成形部に対して突き合わせ面を介して突き合わされるので、図17に示す従来技術のように、箱抜き穴の内面に発泡スチロールの残留物が付着したり凹状の筋が形成されたりすることはなく、成型後の箱抜き穴の仕上がりを良好なものとすることができる。そして、互いに隣接する分割型枠の分割内面成形部同士の突き合わせ面は、脱型順序が先行する分割型枠の分割内面成形部を前記箱抜き穴の内面から離反させる方向に沿って形成されているので、箱抜き型枠を取り壊すことなく、所定の脱型順序にしたがって各分割型枠を箱抜き穴から脱型することができ、箱抜き型枠の転用を可能にすることができる。   According to this configuration, the divided inner surface molded portion in the plurality of divided molds constituting the box-opening mold is abutted against the divided inner surface molded portions of the other adjacent divided mold frames via the abutting surface. As in the prior art shown in FIG. 17, there is no adhesion of styrofoam residue or formation of concave streaks on the inner surface of the box opening hole, and the finished box opening hole after molding is good. can do. And the butting surfaces of the divided inner surface forming parts of the adjacent divided molds are formed along the direction in which the divided inner surface forming parts of the divided molds that are preceded by the demolding order are separated from the inner surface of the box opening hole. Therefore, it is possible to remove each of the divided molds from the boxing holes in accordance with a predetermined demolding order without destroying the boxing molds, thereby enabling the diversion of the boxing molds.

前記分割内面成形部は、箱抜き穴の底面の一部を成形する分割底面成形部と、箱抜き穴の内側面の一部を成形する分割側面成形部とから構成することができる。
このような構成によって、箱抜き穴の底面と側面との双方において、良好な仕上がりを得ることができる。
The divided inner surface forming portion can be constituted by a divided bottom surface forming portion that forms a part of the bottom surface of the box opening hole and a divided side surface forming portion that forms a part of the inner surface of the box opening hole.
With such a configuration, a good finish can be obtained on both the bottom surface and the side surface of the box opening hole.

前記分割型枠は、前記分割底面成型部及び前記分割側面成形部の内側に補強枠材を備えており、
互いに隣接する分割型枠の補強枠材の間には、各分割型枠の分割底面成形部及び分割側面成型部を箱抜き穴の底面及び内側面から離反する方向への移動を許容する隙間が形成されていることが好ましい。
The split mold has a reinforcing frame material inside the split bottom surface molding part and the split side surface molding part,
Between the reinforcing frame materials of the divided molds adjacent to each other, there is a gap that allows the divided bottom surface molded part and the divided side surface molded part of each divided mold frame to move away from the bottom surface and the inner surface of the boxing hole. Preferably it is formed.

本発明に係る箱抜き穴の施工方法は、上述の箱抜き型枠を使用してコンクリート構造物に箱抜き穴を成型する、箱抜き穴の施工方法であって、
隣接する分割型枠の分割内面成形部同士を互いに突き合わせた状態で複数の分割型枠を連結して箱抜き型枠を組み立て、この箱抜き型枠を箱抜き穴の成形部位にセットするセット工程と、
前記箱抜き型枠の周囲にコンクリートを打設して箱抜き穴を成型する成型工程と、
成型された箱抜き穴から箱抜き型枠を脱型する脱型工程とを含み、
前記脱型工程は、複数の分割型枠の連結を解く工程と、複数の分割型枠のうち、より脱型順序が先行する分割型枠を、隣接する他の分割型枠に対する前記突き合わせ面に沿った方向に移動させて箱抜き穴から取り外す工程とを含むことを特徴とする。
The boxing hole construction method according to the present invention is a boxing hole construction method for molding a boxing hole in a concrete structure using the above-described boxing mold,
A set process in which a plurality of divided molds are connected in a state where the divided inner surface molded portions of adjacent divided molds are abutted with each other to assemble a box-shaped mold, and this box-shaped mold is set at a molding part of a box-shaped hole When,
A molding step in which concrete is placed around the boxing mold to mold a boxing hole;
A demolding step of demolding the boxing mold from the molded boxing hole,
The demolding step includes a step of releasing the connection of a plurality of divided molds, and a divided mold that has a higher demolding order among the plurality of divided molds to the abutting surface with respect to another adjacent divided mold And a step of removing it from the box opening hole.

本発明の箱抜き型枠及び箱抜き穴の施工方法によれば、脱型後の箱抜き穴の仕上がりを悪化させることなく、容易に脱型作業を行うことができ、木製であっても複数回の転用を可能にすることができる。   According to the boxing formwork and boxing hole construction method of the present invention, it is possible to easily perform the demolding operation without deteriorating the finish of the boxing hole after demolding. The diversion of the times can be made possible.

(a)は本発明の第1の実施形態に係る箱抜き型枠の側面図、(b)は(a)のA部拡大図である。(A) is a side view of the box-opening mold according to the first embodiment of the present invention, and (b) is an enlarged view of part A of (a). 箱抜き型枠の正面図である。It is a front view of a boxing formwork. (a)は図2のB部拡大図、(b)は図2のC部拡大図、(c)は図2のD部拡大図、(d)は図2のF部拡大図、(e)は図2のG部拡大図である。2A is an enlarged view of a portion B of FIG. 2, FIG. 2B is an enlarged view of a portion C of FIG. 2, FIG. 2C is an enlarged view of a portion D of FIG. ) Is an enlarged view of a portion G in FIG. (a)は箱抜き型枠の上部側の平面図、(b)は(a)のH部拡大図である。(A) is a top view of the upper part side of a boxing formwork, (b) is the H section enlarged view of (a). (a)は箱抜き型枠の下部側の底面図、(b)は(a)のJ部拡大図である。(A) is a bottom view of the lower side of the boxing mold, and (b) is an enlarged view of the J part of (a). 箱抜き型枠の上部側の分解斜視図である。It is a disassembled perspective view of the upper part side of a boxing formwork. 箱抜き型枠の下部側の分解斜視図である。FIG. 箱抜き型枠の脱型の手順を説明する説明図である。It is explanatory drawing explaining the procedure of the demolding of a boxing mold. 箱抜き型枠の脱型の手順を説明する説明図である。It is explanatory drawing explaining the procedure of the demolding of a boxing mold. 箱抜き型枠の脱型の手順を説明する説明図である。It is explanatory drawing explaining the procedure of the demolding of a boxing mold. 箱抜き型枠の脱型の手順を説明する説明図である。It is explanatory drawing explaining the procedure of the demolding of a boxing mold. 図2のE部拡大図である。It is the E section enlarged view of FIG. 連結部材(キャンバー)の分解斜視図である。It is a disassembled perspective view of a connection member (camber). 本発明の第2の実施形態における連結部材の正面図である。It is a front view of the connection member in the 2nd Embodiment of this invention. 同連結部材の平面図である。It is a top view of the connection member. 箱抜き穴が形成されたトンネルの一部断面図である。It is a partial cross section figure of the tunnel in which the box hole was formed. 従来の箱抜き型枠を示す斜視図である。It is a perspective view which shows the conventional boxing formwork.

〔第1の実施形態〕
以下、図面を参照して本発明の第1の実施形態を説明する。
図1(a)は本発明の第1の実施形態に係る箱抜き型枠10の側面図、(b)は(a)のA部拡大図である。図2は、箱抜き型枠10の正面図である。
本実施形態の箱抜き型枠10は、トンネル11の覆工コンクリート12の内周面に対して、径方向内方(矢印F方向)に開放する凹状の箱抜き穴13を成形するものである。本実施形態の箱抜き穴13は、その上部側の左右幅、上下高さ、及び深さの各寸法が下部側の各寸法よりも大きく形成されている。したがって、この箱抜き穴13を成形する箱抜き型枠10も、上部側が大きく下部側が小さく形成されている。なお、以下の説明においては、矢印Fで示す方向を前方とし、その反対方向を後方とする。
[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
Fig.1 (a) is a side view of the boxing mold 10 which concerns on the 1st Embodiment of this invention, (b) is the A section enlarged view of (a). FIG. 2 is a front view of the boxing mold 10.
The boxing mold 10 of this embodiment forms a concave boxing hole 13 that opens radially inward (arrow F direction) with respect to the inner peripheral surface of the lining concrete 12 of the tunnel 11. . The box opening hole 13 of the present embodiment is formed such that the left and right widths, the vertical heights, and the depths on the upper side are larger than the respective dimensions on the lower side. Therefore, the boxing mold 10 for forming the boxing hole 13 is also formed such that the upper side is large and the lower side is small. In the following description, the direction indicated by the arrow F is the front and the opposite direction is the rear.

箱抜き型枠10は、木製の板材を組み合わせて接合することによって形成されており、箱抜き穴13の上部側を成形する上側型枠15と、箱抜き穴13の下部側を成形する下側型枠16とを備えている。上側型枠15及び下側型枠16は、それぞれ箱抜き穴13の内面(底面17,内側面19)を成形する内面成形部18,20を有している。また、内面成形部18,20は、箱抜き穴13の底面17を成形する底面成形部18と、箱抜き穴13の内側面を成形する側面成形部20とからなる。   The boxing mold 10 is formed by combining and joining wooden plates, and an upper mold 15 for forming the upper side of the boxing hole 13 and a lower side for forming the lower side of the boxing hole 13. And a formwork 16. The upper mold 15 and the lower mold 16 have inner surface molding portions 18 and 20 for molding the inner surface (the bottom surface 17 and the inner surface 19) of the box opening hole 13, respectively. The inner surface molding portions 18 and 20 include a bottom surface molding portion 18 that molds the bottom surface 17 of the box opening hole 13 and a side surface molding portion 20 that molds the inner surface of the box opening hole 13.

箱抜き型枠10は、複数の分割型枠(第1〜第6分割型枠)211〜216を上下左右に並べて連結することによって構成されている。各分割型枠211〜216は、前方Fが開放した略直方体の箱型に形成されている。   The box-opening mold 10 is configured by connecting a plurality of divided molds (first to sixth divided molds) 211 to 216 side by side in the vertical and horizontal directions. Each of the divided molds 211 to 216 is formed in a substantially rectangular parallelepiped box shape with the front F open.

〔上側型枠15の構成〕
図6は、箱抜き型枠10の上部側(上側型枠15)を背面側から見た分解斜視図である。なお、この図6では、内面成形部18,20の形状をより解りやすくするために、後述する補強枠材24や補強板25(図2参照)の図示を省略している。
[Configuration of Upper Form 15]
FIG. 6 is an exploded perspective view of the upper side (upper mold 15) of the boxing mold 10 viewed from the back side. In FIG. 6, illustration of a reinforcing frame member 24 and a reinforcing plate 25 (see FIG. 2), which will be described later, is omitted in order to make the shapes of the inner surface molded portions 18 and 20 easier to understand.

図2及び図6に示すように、上側型枠15は、合計4個の分割型枠(第1〜第4分割型枠)211〜214から構成されている。各分割型枠211〜214は、縦横(上下、左右)に2個ずつ並設されている。本実施形態では、図2の左上側(図6の右上側)に配置された分割型枠を第1分割型枠211、図2の右上側(図6の左上側)に配置された分割型枠を第2分割型枠212、図2の左下側(図6の右下側)に配置された分割型枠を第3分割型枠213、図2の右下側(図6の左下側)に配置された分割型枠を第4分割型枠214とそれぞれ呼称する。第1〜第4分割型枠211〜214の上下方向の高さは略同一であり、第1,第3分割型枠211,213の左右方向の幅は、第2,第4分割型枠212,214の左右方向の幅よりも小さく形成されている。   As shown in FIGS. 2 and 6, the upper mold 15 includes a total of four divided molds (first to fourth divided molds) 211 to 214. Each of the divided molds 211 to 214 is arranged two by two in the vertical and horizontal directions (up and down, left and right). In the present embodiment, the divided mold placed on the upper left side in FIG. 2 (upper right side in FIG. 6) is the first divided mold 211, and the divided mold placed on the upper right side in FIG. 2 (upper left side in FIG. 6). The frame is the second divided mold 212, the divided mold frame arranged on the lower left side in FIG. 2 (lower right side in FIG. 6) is the third divided mold frame 213, and the lower right side in FIG. 2 (lower left side in FIG. 6). Each of the divided molds arranged in is called a fourth divided mold 214. The vertical heights of the first to fourth divided molds 211 to 214 are substantially the same, and the horizontal widths of the first and third divided molds 211 and 213 are the second and fourth divided molds 212. , 214 is formed smaller than the width in the left-right direction.

図6に示すように、第1〜第4分割型枠211〜214は、上側型枠15の底面成形部18を縦横に4つに分割した分割底面成形部(第1〜第4分割底面成形部)181〜184を有している。各分割底面成形部181〜184は、四角形状の板材から形成されている。   As shown in FIG. 6, the 1st-4th division | segmentation molds 211-214 are divided | segmented bottom face shaping | molding parts (1st-4th division | segmentation bottom face shaping | molding) which divided | segmented the bottom face shaping | molding part 18 of the upper mold 15 into four vertically and horizontally. Part) 181-184. Each of the divided bottom surface forming portions 181 to 184 is formed of a rectangular plate material.

また、図6に示すように、第1〜第4分割型枠211〜214は、それぞれ側面成型部20を上下左右に4つに分割した分割側面成型部(第1〜第4分割側面成形部)201〜204を有している。各分割型枠211〜214の分割側面成形部201〜204は、略直角に配置された2枚の四角形状の板材から構成されている。従って、各分割型枠211〜214には、1面の分割底面成形部181〜184と2面の分割側面成形部201〜204とが設けられている。   Moreover, as shown in FIG. 6, the 1st-4th division | segmentation molds 211-214 are respectively divided | segmented side surface molding parts (1st-4th division | segmentation side surface molding part) which divided | segmented the side surface molding part 20 up and down, left and right. ) 201-204. The divided side surface forming parts 201 to 204 of the divided molds 211 to 214 are constituted by two rectangular plate members arranged substantially at right angles. Accordingly, each of the divided molds 211 to 214 is provided with one divided bottom surface forming portion 181 to 184 and two divided surface forming portions 201 to 204.

図2に示すように、第1〜第4分割型枠211〜214は、それぞれ分割底面成形部181〜184及び分割側面成形部201〜204の内側に固定された補強枠材24を備えている。この補強枠材24は、各分割側面成形部201〜204に対して間隔をあけて略平行に対向して配置されている。
また、各分割型枠211〜214において、分割側面成形部201〜204と補強枠材24との間に形成されるスペースには、横一文字状又は十字状の補強板25が設けられている。
As shown in FIG. 2, each of the first to fourth divided molds 211 to 214 includes a reinforcing frame member 24 fixed inside the divided bottom surface forming portions 181 to 184 and the divided side surface forming portions 201 to 204, respectively. . The reinforcing frame member 24 is disposed so as to face each of the divided side surface forming parts 201 to 204 substantially in parallel with a space therebetween.
Further, in each of the divided molds 211 to 214, a horizontal one-letter or cross-shaped reinforcing plate 25 is provided in a space formed between the divided side surface forming parts 201 to 204 and the reinforcing frame member 24.

図4(a)は箱抜き型枠10の上部側(上側型枠15)の平面図、(b)は(a)のH部拡大図である。第1〜第4分割型枠211〜214は、互いに隣接する第1〜第4分割底面成形部181〜184の端面同士が突き合わされた状態で連結される。具体的には図6、図1(b)、及び図4(b)に示すように、第1分割型枠211と第2分割型枠212との分割底面成形部181,182の端面31,33同士が突き合わされ、第1分割型枠211と第3分割型枠213の分割底面成形部181,183の端面32,35同士が突き合わされる。また、第2分割型枠212と第4分割型枠214の分割底面成形部182,184の端面34,38同士が突き合わされ、第3分割型枠213と第4分割型枠214の分割底面成形部183,184の端面36,37同士が突き合わされる。   4A is a plan view of the upper side (upper mold 15) of the boxing mold 10, and FIG. 4B is an enlarged view of the H part of FIG. The 1st-4th division | segmentation mold 211-214 is connected in the state by which the end surfaces of the 1st-4th division | segmentation bottom face shaping | molding parts 181-184 adjacent to each other were faced | matched. Specifically, as shown in FIG. 6, FIG. 1 (b), and FIG. 4 (b), the end faces 31 of the divided bottom surface molding portions 181 and 182 of the first divided mold 211 and the second divided mold 212, 33 are abutted, and the end surfaces 32 and 35 of the divided bottom surface forming portions 181 and 183 of the first divided mold 211 and the third divided mold 213 are abutted. Further, the end surfaces 34 and 38 of the divided bottom surface forming portions 182 and 184 of the second divided mold 212 and the fourth divided mold 214 are abutted with each other, and the divided bottom surface molding of the third divided mold 213 and the fourth divided mold 214 is performed. The end surfaces 36 and 37 of the parts 183 and 184 are abutted with each other.

図3(a)は図2のB部拡大図、(b)は図2のC部拡大図、(c)は図2のD部拡大図、(d)は図2のF部拡大図、(e)は図2のG部拡大図である。
第1〜第4分割型枠211〜214は、互いに隣接する第1〜第4分割側面成形部201〜204の端面同士が突き合わされた状態で連結される。具体的には、図6及び図3(a)〜(d)に示すように、第1分割型枠211と第2分割型枠212の分割側面成型部201,202の端面71,73同士が突き合わされ、第1分割型枠211と第3分割型枠213の分割側面成型部201,203の端面72,76同士が突き合わされる。また、第2分割型枠212と第4分割型枠214の分割側面成型部202,204の端面74,78同士が突き合わされ、第3分割型枠213と第4分割型枠214の分割側面成形部203,204の端面75,77同士が突き合わされる。
3 (a) is an enlarged view of a portion B in FIG. 2, (b) is an enlarged view of a portion C in FIG. 2, (c) is an enlarged view of a portion D in FIG. 2, (d) is an enlarged view of an F portion in FIG. (E) is the G section enlarged view of FIG.
The 1st-4th division | segmentation mold 211-214 are connected in the state by which the end surfaces of the 1st-4th division | segmentation side surface molding parts 201-204 adjacent to each other were faced | matched. Specifically, as shown in FIG. 6 and FIGS. 3A to 3D, the end surfaces 71 and 73 of the split side surface molding portions 201 and 202 of the first split mold 211 and the second split mold 212 are connected to each other. The end surfaces 72 and 76 of the divided side surface molding portions 201 and 203 of the first divided mold 211 and the third divided mold 213 are butted. Further, the end surfaces 74 and 78 of the divided side surface molding portions 202 and 204 of the second divided mold frame 212 and the fourth divided mold frame 214 are abutted with each other, and the divided side surface molding of the third divided mold frame 213 and the fourth divided mold frame 214 is performed. The end surfaces 75 and 77 of the parts 203 and 204 are abutted with each other.

第1〜第4分割底面成形部181〜184の突き合わせ面31〜38は、箱抜き穴13の底面17に対して約45°の傾斜を持った傾斜面(テーパー面)とされている。また、第1〜第4分割側面成形部201〜204の突き合わせ面71〜78は、箱抜き穴13の内側面に対して約45°の傾斜を持った傾斜面(テーパー面)とされている。この傾斜面の傾斜方向は、箱抜き穴13からの分割型枠211〜214の脱型順序に関係して設定されており、この詳細については後述する。   The butting surfaces 31 to 38 of the first to fourth divided bottom surface forming portions 181 to 184 are inclined surfaces (taper surfaces) having an inclination of about 45 ° with respect to the bottom surface 17 of the box opening hole 13. Further, the abutting surfaces 71 to 78 of the first to fourth divided side surface forming parts 201 to 204 are inclined surfaces (taper surfaces) having an inclination of about 45 ° with respect to the inner surface of the box opening hole 13. . The inclination direction of the inclined surface is set in relation to the order of removing the divided molds 211 to 214 from the box opening hole 13, and details thereof will be described later.

なお、突き合わせ面31〜38,71〜78の傾斜角度は、約45°に限定されず、これよりも大きく又は小さくすることも可能である。   In addition, the inclination | tilt angle of the butting surfaces 31-38, 71-78 is not limited to about 45 degrees, It is also possible to make it larger or smaller than this.

図2に示すように、第1〜第4分割型枠211〜214の隣接する補強枠材24の間には隙間Sが形成されている。そして、第1〜第4分割型枠211〜214は、この隙間Sに配置された連結部材51,58によって互いに連結される。   As shown in FIG. 2, a gap S is formed between the reinforcing frame members 24 adjacent to the first to fourth divided molds 211 to 214. The first to fourth divided molds 211 to 214 are connected to each other by connecting members 51 and 58 arranged in the gap S.

〔下側型枠16の構成〕
図5(a)は箱抜き型枠10の下部側(下側型枠16)の底面図、(b)は(a)のJ部拡大図である。図7は、箱抜き型枠10の下部側(下側型枠16)を背面側から見た分解斜視図である。なお、この図7においても、内面成形部18,20の構造を解りやすくするために、後述する補強枠材43の図示を省略している。
図2、図5、及び図7に示すように、下側型枠16は、合計2個の分割型枠(第5,第6分割型枠)215,216から構成され、各分割型枠215,216は左右に並べて配置されている。本実施形態では、図2の右側(図7の左側)に配置された分割型枠を第5分割型枠215と呼称し、図2の左側(図7の右側)に配置された分割型枠を第6分割型枠216と呼称する。第5,第6分割型枠215,216は、略同一の上下高さを有しており、第5分割型枠215の左右方向の幅は、第6分割型枠216の左右方向の幅よりも小さく形成されている。
[Configuration of Lower Form 16]
FIG. 5A is a bottom view of the lower side (lower mold 16) of the boxing mold 10, and FIG. 5B is an enlarged view of a portion J of FIG. FIG. 7 is an exploded perspective view of the lower side (lower mold 16) of the boxing mold 10 as seen from the back side. Also in FIG. 7, in order to make the structure of the inner surface molded portions 18 and 20 easier to understand, illustration of a reinforcing frame member 43 described later is omitted.
As shown in FIGS. 2, 5, and 7, the lower mold 16 includes a total of two divided molds (fifth and sixth divided molds) 215 and 216, and each divided mold 215. , 216 are arranged side by side on the left and right. In the present embodiment, the divided formwork arranged on the right side of FIG. 2 (left side of FIG. 7) is called a fifth divided formwork 215, and the divided formwork arranged on the left side of FIG. 2 (right side of FIG. 7). Is referred to as a sixth divided formwork 216. The fifth and sixth divided molds 215 and 216 have substantially the same vertical height, and the width of the fifth divided mold 215 in the left-right direction is larger than the width of the sixth divided mold 216 in the left-right direction. Is also formed small.

図7に示すように、第5,第6分割型枠215,216は、底面成形部18を左右2つに分割した分割底面成形部(第5,第6分割底面成形部)185,186を有している。各分割底面成形部185,186は、略四角形状の板材から形成されている。   As shown in FIG. 7, the fifth and sixth divided molds 215 and 216 include divided bottom surface molded portions (fifth and sixth divided bottom surface molded portions) 185 and 186 obtained by dividing the bottom surface molded portion 18 into two left and right. Have. Each of the divided bottom surface forming portions 185 and 186 is formed from a substantially rectangular plate material.

下側型枠16の側面成形部20は、底面成形部18の下辺と左右両側辺から前方Fへ延びる3つの板材(面)から形成されている。そして、第5,第6割型枠215,216は、分割底面成形部185,186の下辺と、左右片側の側辺とから前方Fに延びる分割側面成型部(第5,第6分割側面成形部)205,206を有している。   The side molding part 20 of the lower mold 16 is formed of three plate members (surfaces) extending forward F from the lower side and the left and right sides of the bottom molding part 18. The fifth and sixth split molds 215 and 216 are divided side surface molding portions (fifth and sixth divided side surface moldings) extending forward F from the lower sides of the divided bottom surface molding portions 185 and 186 and the left and right sides. Part) 205,206.

図2に示すように、第5,第6分割型枠215,216は、それぞれ分割底面成形部185,186及び分割側面成形部205,206の内側に固定された補強枠材24を備えている。この補強枠材24は、各分割側面成形部205,206に対して間隔をあけて略平行に対向して配置されている。   As shown in FIG. 2, the fifth and sixth divided molds 215 and 216 include reinforcing frame members 24 fixed inside the divided bottom surface forming portions 185 and 186 and the divided side surface forming portions 205 and 206, respectively. . The reinforcing frame member 24 is disposed to face each of the divided side surface forming portions 205 and 206 so as to be substantially parallel to each other with a space therebetween.

また、各分割型枠215,216において、分割側面成形部205,206と補強枠材24との間に形成されるスペースには、横一文字状の補強板43が設けられている。
また、図2に示すように第5,第6分割型枠215,216の上面(補強枠材24)は、上側型枠15の下面に当接されているため、直接、箱抜き穴13の内側面を成形するためには利用されていない。
Further, in each of the divided molds 215 and 216, a horizontal single-character reinforcing plate 43 is provided in a space formed between the divided side surface forming portions 205 and 206 and the reinforcing frame member 24.
Further, as shown in FIG. 2, since the upper surfaces (reinforcing frame members 24) of the fifth and sixth divided molds 215 and 216 are in contact with the lower surface of the upper mold 15, It is not used to mold the inner surface.

図5(b)に示すように、第5分割型枠215と第6分割型枠216とは、分割底面成形部185,186の端面47,48同士が互いに突き合わされている。この突き合わせ面47,48は、箱抜き穴13の底面17に対して約45°傾斜する傾斜面(テーパー面)とされている。   As shown in FIG. 5B, the end surfaces 47 and 48 of the divided bottom surface forming portions 185 and 186 are abutted against each other in the fifth divided mold frame 215 and the sixth divided mold frame 216. The abutting surfaces 47 and 48 are inclined surfaces (tapered surfaces) inclined by about 45 ° with respect to the bottom surface 17 of the box opening hole 13.

また、図3(e)(図2のG部拡大図)に示すように、第5分割型枠215と第6分割型枠216の分割側面成型部205,206の端面45,46同士が互いに突き合わされている。この突き合わせ面45,46は、箱抜き穴13の内側面19に対して約45°する傾斜面(テーパー面)とされている。
突き合わせ面47,48,45,46の傾斜方向は、箱抜き穴13からの分割型枠215,216の脱型順序に関係して設定されており、この詳細については後述する。
Further, as shown in FIG. 3E (enlarged view of the G part in FIG. 2), the end faces 45 and 46 of the divided side molding parts 205 and 206 of the fifth divided mold 215 and the sixth divided mold 216 are mutually connected. It is faced. The abutting surfaces 45 and 46 are inclined surfaces (tapered surfaces) that are about 45 ° with respect to the inner surface 19 of the box opening hole 13.
The inclination directions of the butted surfaces 47, 48, 45, 46 are set in relation to the removal order of the divided molds 215, 216 from the box opening hole 13, and details thereof will be described later.

図2に示すように、第5,第6分割型枠215,216の隣接する補強枠材24の間には隙間Sが形成されている。そして、この隙間Sに配置された連結部材51,58によって第5,第6分割型枠215,216が相互に連結される。   As shown in FIG. 2, a gap S is formed between the reinforcing frame members 24 adjacent to the fifth and sixth divided mold frames 215 and 216. The fifth and sixth divided mold frames 215 and 216 are connected to each other by the connecting members 51 and 58 disposed in the gap S.

〔連結部材51,58の構成〕
図2に示すように、互いに隣接する分割型枠211〜216の補強枠材24同士は、連結部材51,58によって連結されている。この連結部材51,58は、隣接する補強枠材24の間に配置されるキャンバー51と、このキャンバー51を介して隣接する補強枠材24を連結する連結具58とによって構成されている。なお、図2においてはキャンバー51をわかりやすく示すためにハッチングを施している。
[Configuration of connecting members 51 and 58]
As shown in FIG. 2, the reinforcing frame members 24 of the divided mold frames 211 to 216 adjacent to each other are connected by connecting members 51 and 58. The connecting members 51 and 58 are configured by a camber 51 disposed between adjacent reinforcing frame members 24 and a connecting tool 58 that connects the adjacent reinforcing frame members 24 via the camber 51. In FIG. 2, the camber 51 is hatched for easy understanding.

以下、連結部材51,58について、図2のE部に配置されたものを例に詳細に説明する。図12は、図2のE部拡大図である。図13は、キャンバー51の分解斜視図である。
このキャンバー51は、木製の2つの分割体53を重ね合わせることによって構成され、全体として略直方体のブロック形状に形成されている。このキャンバー51の厚さtは、隣接する補強枠材24間に形成される隙間Sの寸法と同一寸法とされている。また、キャンバー51の2つの分割体53の重合面55は、厚さt方向に垂直な面に対して傾斜する傾斜面とされている。したがって、2つの分割体53を傾斜面55に沿って幅方向外側(図13の矢印a方向)にずらすことにより、キャンバー51の厚さtを縮小することができる。
Hereinafter, the connecting members 51 and 58 will be described in detail by taking the one arranged in the E part of FIG. 2 as an example. FIG. 12 is an enlarged view of a portion E in FIG. FIG. 13 is an exploded perspective view of the camber 51.
The camber 51 is configured by overlapping two wooden divided bodies 53 and is formed in a substantially rectangular parallelepiped block shape as a whole. The thickness t of the camber 51 is the same as the dimension of the gap S formed between the adjacent reinforcing frame members 24. Further, the overlapping surface 55 of the two divided bodies 53 of the camber 51 is an inclined surface that is inclined with respect to a plane perpendicular to the thickness t direction. Therefore, the thickness t of the camber 51 can be reduced by shifting the two divided bodies 53 outward in the width direction (in the direction of arrow a in FIG. 13) along the inclined surface 55.

キャンバー51には、2つの分割体53に渡って貫通するボルト挿通孔59bが形成されている(図13)。そして、連結具58を構成するボルトを、隣接する補強枠材24とキャンバー51のボルト挿通孔59bとに貫通させてナットに締結することによって、隣接する分割型枠211〜214を相互に連結することができる。   The camber 51 is formed with a bolt insertion hole 59b penetrating over the two divided bodies 53 (FIG. 13). Then, the adjacent split molds 211 to 214 are connected to each other by passing the bolts constituting the connector 58 through the adjacent reinforcing frame member 24 and the bolt insertion hole 59b of the camber 51 and fastening them to the nut. be able to.

また、キャンバー51は、2つの分割体53が連結具58により連結されることによって、分割型枠213,214の枠本体部24間の隙間S寸法に一致するように厚さtが保持される。そして、この連結具58を取り外せば、2つの分割体53の相対位置規制が解かれるので、図13の矢印a方向への相対移動により厚さ寸法tを縮小することができ、隣接する補強枠材24の間からキャンバー51を容易に抜き取ることができる。   In addition, the camber 51 has the thickness t so as to match the size of the gap S between the frame main body portions 24 of the divided mold frames 213 and 214 by connecting the two divided bodies 53 by the connecting tool 58. . Then, by removing this connecting tool 58, the relative position restriction between the two divided bodies 53 is released, so that the thickness dimension t can be reduced by the relative movement in the direction of arrow a in FIG. The camber 51 can be easily extracted from between the materials 24.

なお、キャンバー51に形成されたボルト挿通孔59bは、連結具58を構成するボルトの直径とほぼ同じ内径に形成され、両者の間にほとんど隙間が生じないように形成されている。これによって、連結具58によって連結された2つの分割体53の相対位置がガタツキなく定まり、厚さtを正確に設定することが可能となる。   The bolt insertion hole 59b formed in the camber 51 is formed to have an inner diameter that is substantially the same as the diameter of the bolt that constitutes the connector 58, and is formed so that there is almost no gap between the two. As a result, the relative positions of the two divided bodies 53 connected by the connecting tool 58 are determined without backlash, and the thickness t can be set accurately.

図2に示すように、連結部材51,58は、補強枠材24の角部や、補強枠材24に補強板25が突き合わされている部分に対応して配置されている。このような配置によって、コンクリートの硬化に伴う圧縮力で、補強枠材24の間に挟まれたキャンバー51の存在により補強枠材24が撓んでしまうことがなく、補強枠材24の変形を防止し、脱型の際のキャンバー51の取り外しも容易に行うことができる。   As shown in FIG. 2, the connecting members 51 and 58 are arranged corresponding to the corners of the reinforcing frame member 24 and the portions where the reinforcing plate 25 is abutted against the reinforcing frame member 24. With such an arrangement, the reinforcing frame member 24 is not bent due to the presence of the camber 51 sandwiched between the reinforcing frame members 24 by the compressive force accompanying the hardening of the concrete, and the deformation of the reinforcing frame member 24 is prevented. In addition, it is possible to easily remove the camber 51 when removing the mold.

図12に示すように、4つの分割型枠211〜214の補強枠材24の角部が集中する位置には、キャンバー51だけでなく、支持部材61が設けられている。第1,第3分割型枠211,213の間、及び第2,第4分割型枠212,214の間にはキャンバー51が設けられているが、第1,第2分割型枠211,212の間、及び第3,第4分割型枠213,214の間には支持部材61が設けられている。   As shown in FIG. 12, not only the camber 51 but the support member 61 is provided in the position where the corner | angular part of the reinforcement frame material 24 of the four division | segmentation mold frames 211-214 concentrates. A camber 51 is provided between the first and third divided molds 211 and 213 and between the second and fourth divided molds 212 and 214, but the first and second divided molds 211 and 212 are provided. And a support member 61 is provided between the third and fourth divided molds 213 and 214.

支持部材61の幅方向の両端部にはハの字状にテーパー面61aが形成され、第1〜第4分割型枠211〜214の補強枠材24の角部にも、テーパー面61aに適合するテーパー面24aがそれぞれ形成されている。また、支持部材61は、キャンバー51と補強枠材24とによって挟まれることによって保持され、取り付けのためにボルト等の連結具は用いられていない。
そして、この支持部材61は、第1,第3分割型枠211,213の間、及び第2,第4分割型枠212,214の間からそれぞれキャンバー51を取り外すことによって容易に取り外すことができる。
Tapered surfaces 61a are formed in a C shape at both ends in the width direction of the support member 61, and the corners of the reinforcing frame member 24 of the first to fourth divided molds 211 to 214 are also adapted to the tapered surface 61a. Tapered surfaces 24a are formed respectively. Further, the support member 61 is held by being sandwiched between the camber 51 and the reinforcing frame member 24, and a connecting tool such as a bolt is not used for attachment.
The support member 61 can be easily removed by removing the camber 51 from between the first and third divided molds 211 and 213 and between the second and fourth divided molds 212 and 214, respectively. .

本実施形態では、分割型枠211〜214の角部が集中する箇所において、キャンバー51が集中して配置されるのを防ぎ、構造が簡単で連結具が不要な支持部材61で代替することにより、箱抜き型枠10の組み立てや脱型をより容易に行うことができる。   In the present embodiment, the camber 51 is prevented from being concentrated at the location where the corners of the divided molds 211 to 214 are concentrated, and is replaced with a support member 61 that has a simple structure and does not require a connector. As a result, the boxing mold 10 can be assembled and removed more easily.

〔箱抜き型枠の脱型手順〕 [Demolding procedure for boxing molds]

以上のように構成された箱抜き型枠10は、トンネル11内において覆工コンクリート12を打設する前にトンネル11内に設置され、覆工コンクリート12の打設時に同時に箱抜き穴13を成形する。また、箱抜き型枠10の底面成形部18及び側面成形部20には、成形後の箱抜き穴13からの脱型を容易にするために、剥離剤が塗布される。   The box forming form 10 configured as described above is installed in the tunnel 11 before placing the lining concrete 12 in the tunnel 11, and the box opening hole 13 is simultaneously formed when the lining concrete 12 is placed. To do. Further, a release agent is applied to the bottom surface forming part 18 and the side surface forming part 20 of the boxing mold 10 in order to facilitate demolding from the boxing hole 13 after forming.

覆工コンクリート12が硬化した後、箱抜き型枠10は以下の手順で箱抜き穴13から脱型することができる。
まず、図2に示すように、分割型枠211〜216の補強枠材24同士を連結する全ての連結部材51,58を取り外す。連結部材51,58のキャンバー51は、箱抜き型枠10の周囲のコンクリートが硬化に伴い収縮することによって補強枠材24から圧縮力を受けるが、キャンバー51は、図13に示すように各分割体53の位置を傾斜面55に沿って幅方向にずらすことで厚さtを縮小することができるので、隣接する連結枠材24の隙間Sから簡単に取り外すことができる。
After the lining concrete 12 is hardened, the boxing mold 10 can be removed from the boxing hole 13 by the following procedure.
First, as shown in FIG. 2, all the connecting members 51 and 58 that connect the reinforcing frame members 24 of the divided molds 211 to 216 are removed. The camber 51 of the connecting members 51 and 58 receives a compressive force from the reinforcing frame member 24 as the concrete around the boxing mold 10 contracts as it hardens, but the camber 51 is divided into individual parts as shown in FIG. Since the thickness t can be reduced by shifting the position of the body 53 along the inclined surface 55 in the width direction, the thickness 53 can be easily removed from the gap S between the adjacent connecting frame members 24.

全ての連結部材51,58を取り外した後、各分割型枠211〜216を箱抜き穴13から脱型する。この手順を図8〜図11を参照して説明する。図8〜図11は、箱抜き型枠10の上側型枠15の脱型の手順を説明する図であり、特に、図8(a)は、箱抜き型枠(上側型枠15)の正面図、(b)は同平面図、(c)は同左側面図である。図9(a)は同正面図、(b)は同右側面図である。図10(a)は同正面図、(b)は同底面図である。図11は同正面図である。   After removing all the connecting members 51 and 58, the divided molds 211 to 216 are removed from the box opening holes 13. This procedure will be described with reference to FIGS. 8-11 is a figure explaining the procedure of the demolding of the upper mold 15 of the boxing mold 10, and in particular, Fig. 8 (a) shows the front of the boxing mold (upper mold 15). (B) is the same plan view, (c) is the left side view. FIG. 9A is a front view thereof, and FIG. 9B is a right side view thereof. FIG. 10A is a front view thereof, and FIG. 10B is a bottom view thereof. FIG. 11 is a front view of the same.

本実施形態では、第1分割型枠211〜第6分割型枠216の順番で脱型を行うように順序が定められている。
まず、第1分割型枠211を脱型するには、図8に示すように、各分割型枠211〜214の補強枠材24間に形成された隙間Sにバール等の工具を挿入して第1分割型枠211に引っ掛け、この第1分割型枠211を隙間Sの範囲で矢印I方向に移動させる。
In the present embodiment, the order is determined so as to perform demolding in the order of the first divided mold 211 to the sixth divided mold 216.
First, in order to remove the first divided mold 211, a tool such as a bar is inserted into the gap S formed between the reinforcing frame members 24 of the divided molds 211 to 214, as shown in FIG. The first divided mold 211 is hooked and moved in the direction of arrow I within the gap S.

この際、図8(b)(c)に示すように、第1分割型枠211の第1分割底面成形部181の端面31,32は、それぞれ第2分割底面成形部182の端面33、及び第3分割底面成形部183の端面35に突き合わされ、第1分割側面成形部201の端面71,72は、それぞれ第2分割側面成形部202の端面73及び第3側面成形部203の端面76に突き合わされているが、これらの突き合わせ面は傾斜面(テーパー面)とされている。そして、この傾斜面は、いずれも第1分割型枠211の移動方向(矢印I方向)に沿った面、つまり、第1分割型枠211の分割底面成形部181及び分割側面成形部201を、それぞれ箱抜き孔13の底面17及び側面19から同時に離反させることができる方向に沿った面となっている。そのため、第1分割型枠211は、これに隣接する第2分割型枠212や第3分割型枠213が障害となることなく容易に脱型することができる。   At this time, as shown in FIGS. 8B and 8C, the end surfaces 31 and 32 of the first divided bottom surface molding portion 181 of the first divided mold 211 are respectively the end surface 33 of the second divided bottom surface molding portion 182 and The end surfaces 71 and 72 of the first divided side surface molding portion 201 are respectively brought into contact with the end surface 73 of the second divided side surface molding portion 202 and the end surface 76 of the third side surface molding portion 203. Although being abutted, these abutting surfaces are inclined surfaces (tapered surfaces). And this inclined surface is a surface along the moving direction (arrow I direction) of the first divided mold 211, that is, the divided bottom surface forming portion 181 and the divided side surface forming portion 201 of the first divided mold 211. Each is a surface along a direction that can be separated from the bottom surface 17 and the side surface 19 of the box opening hole 13 at the same time. Therefore, the first divided formwork 211 can be easily removed without causing the second divided formwork 212 and the third divided formwork 213 adjacent thereto to become an obstacle.

次いで、第2分割型枠212を脱型するには、図9(a)(b)に示すように、第2分割型枠212を隙間Sの範囲で矢印II方向に移動させる。
この際、第2分割型枠212の第2分割底面成形部182の端面34は、第4分割底面成形部184の端面38に突き合わされ、第2分割側面成形部202の端面74は、第4分割側面成形部204の端面78に突き合わされ、これらの突き合わせ面は傾斜面(テーパー面)とされている。そして、この傾斜面はいずれも第2分割型枠の移動方向(矢印II方向)に沿った面、つまり、第2分割型枠212の分割底面成形部182及び分割側面成形部202を、それぞれ箱抜き孔の底面17及び側面19から同時に離反させることができる方向に沿った面となっている。そのため、第2分割型枠212は、これに隣接する第4分割型枠214が障害となることなく適切に脱型することができる。
Next, in order to remove the second divided mold 212, the second divided mold 212 is moved in the direction of the arrow II within the gap S as shown in FIGS.
At this time, the end surface 34 of the second divided bottom surface molding portion 182 of the second divided mold 212 is abutted against the end surface 38 of the fourth divided bottom surface molding portion 184, and the end surface 74 of the second divided side surface molding portion 202 is the fourth surface. It abuts against the end surface 78 of the divided side surface forming portion 204, and these abutting surfaces are inclined surfaces (taper surfaces). The inclined surfaces are surfaces along the moving direction (arrow II direction) of the second divided mold frame, that is, the divided bottom surface forming portion 182 and the divided side surface forming portion 202 of the second divided mold frame 212, respectively. It is a surface along a direction that can be separated from the bottom surface 17 and the side surface 19 of the punched hole at the same time. Therefore, the second divided mold 212 can be appropriately removed without causing the fourth divided mold 214 adjacent thereto to become an obstacle.

第3分割型枠213を脱型するには、図10(a)(b)に示すように、第3分割型枠213を隙間Sの範囲内で矢印III方向に移動させる。
この際、第3分割型枠213の第3分割底面成形部183の端面36は、第4分割底面成形部184の端面37に突き合わされ、第3分割側面成形部203の端面75は、第4分割側面成形部204の端面77に突き合わされ、これらの突き合わせ面は傾斜面(テーパー面)とされている。そして、この傾斜面は、いずれも第3分割型枠213の移動方向(矢印III方向)に沿った面、つまり、第3分割型枠213の分割底面成形部183及び分割側面成形部203を、それぞれ箱抜き孔13の底面17及び側面19から同時に離反させる方向に沿った面となっている。そのため、第3分割型枠213は、これに隣接する第3分割型枠214が障害となることなく容易に脱型することができる。
In order to remove the third divided mold 213, the third divided mold 213 is moved in the direction of the arrow III within the gap S as shown in FIGS.
At this time, the end surface 36 of the third divided bottom surface molding portion 183 of the third divided mold 213 is abutted against the end surface 37 of the fourth divided bottom surface molding portion 184, and the end surface 75 of the third divided side surface molding portion 203 is the fourth surface. It abuts against the end surface 77 of the divided side surface forming portion 204, and these abutting surfaces are inclined surfaces (taper surfaces). And this inclined surface is a surface along the moving direction (arrow III direction) of the third divided mold 213, that is, the divided bottom surface forming part 183 and the divided side surface forming part 203 of the third divided mold 213. Each is a surface along the direction of separating from the bottom surface 17 and the side surface 19 of the box opening hole 13 at the same time. Therefore, the third divided mold 213 can be easily removed without causing the third divided mold 214 adjacent thereto to become an obstacle.

次いで、第4分割型枠214を脱型するには、図11に示すように、第4分割型枠214を矢印IV方向、すなわち、第4分割型枠214の分割底面成形部184及び分割側面成形部204が、それぞれ箱抜き孔13の底面17及び内側面19から離反する方向に移動させる。この際、第1〜第3分割型枠211〜213は既に脱型されているので、第4分割型枠214を何ら障害なく脱型することができる。   Next, to remove the fourth divided mold 214, as shown in FIG. 11, the fourth divided mold 214 is moved in the direction of arrow IV, that is, the divided bottom surface forming portion 184 and the divided side surface of the fourth divided mold 214. The forming portions 204 are moved in directions away from the bottom surface 17 and the inner side surface 19 of the box opening hole 13, respectively. At this time, since the first to third divided molds 211 to 213 have already been removed from the mold, the fourth divided mold 214 can be removed without any obstacles.

上記と同様の要領で、残りの第5分割型枠215及び第6分割型枠216についてもこの順で脱型する。この場合、図2、図3(e)、図5(b)、及び図7に示すように、第5分割型枠215における分割底面成形部185の端面47及び分割側面成形部205の端面45と、第6分割型枠216の分割底面成形部186の端面48及び分割側面成形部206の端面46とが傾斜面で突き合わされ、この傾斜面は、第5分割型枠215の分割底面成型部185及び分割側面成形部205を箱抜き穴13の底面17及び内側面19から同時に離反させる方向に沿った面とされている。そのため、同方向に第5分割型枠215を移動させることで、第6分割型枠216が障害となることなく簡単に第5分割型枠215を脱型することができる。そして、第5分割型枠215を脱型した後は、第6分割型枠216を単独で脱型することができる。   In the same manner as described above, the remaining fifth divided mold 215 and sixth divided mold 216 are also removed in this order. In this case, as shown in FIGS. 2, 3 (e), 5 (b), and 7, the end surface 47 of the divided bottom surface forming portion 185 and the end surface 45 of the divided side surface forming portion 205 in the fifth divided mold 215. And the end surface 48 of the divided bottom surface molding part 186 of the sixth divided mold 216 and the end surface 46 of the divided side surface molding part 206 are abutted by an inclined surface, and this inclined surface is a divided bottom surface molded part of the fifth divided mold frame 215. 185 and the divided side surface forming portion 205 are surfaces along the direction in which they are simultaneously separated from the bottom surface 17 and the inner surface 19 of the box opening hole 13. Therefore, by moving the fifth divided formwork 215 in the same direction, the fifth divided formwork 215 can be easily removed without causing the sixth divided formwork 216 to become an obstacle. And after removing the 5th division | segmentation mold 215, the 6th division | segmentation mold 216 can be removed independently.

以上に説明した本実施形態によれば、箱抜き型枠10は、複数の分割型枠211〜216から構成され、各分割型枠211〜216の分割底面成形部及び分割側面成形部が互いに突き合わされている。そのため、分割型枠211〜216の間に相当する箱抜き穴13の内面に残留物が付着したり筋が形成されたりすることがなく、成形後の箱抜き穴の仕上がりを良好なものとすることができる。   According to the present embodiment described above, the boxing mold 10 is composed of a plurality of divided molds 211 to 216, and the divided bottom surface forming part and the divided side surface forming part of each of the divided molds 211 to 216 protrude from each other. Are combined. Therefore, a residue does not adhere to the inner surface of the box opening hole 13 corresponding to the space between the divided molds 211 to 216 and no streak is formed, and the finished box opening hole after molding is made good. be able to.

また、複数の分割型枠211〜216は、脱型順序が所定に定められており、分割型枠211〜216の分割底面成形部181〜186の端面同士、及び分割側面成形部201〜206の端面同士の突き合わせ面は、より脱型順序が先の分割型枠における分割底面成形部及び分割側面成形部を、箱抜き穴13の底面17及び内側面19から離反させる方向に沿って形成された傾斜面とされている。そのため、予め定められた脱型順序で複数の分割型枠211〜216を適切に脱型することができ、脱型作業に要する時間や労力を低減できるとともに、箱抜き型枠10を取り壊すことなく脱型することができるので、複数回の転用が可能となり、小・中規模のトンネル工事にも効率的に利用することができる。   The plurality of divided molds 211 to 216 have a predetermined demolding order, and the end surfaces of the divided bottom surface forming parts 181 to 186 of the divided molds 211 to 216 and the divided side surface forming parts 201 to 206 are arranged. The butted surfaces of the end faces are formed along a direction in which the split bottom surface forming portion and the split side surface forming portion in the previous split mold form are separated from the bottom surface 17 and the inner side surface 19 of the boxing hole 13 in the earlier mold release order. It is an inclined surface. Therefore, the plurality of divided molds 211 to 216 can be appropriately removed in a predetermined removal order, and the time and labor required for the removal work can be reduced, and the box-opening form 10 can be removed. Since it can be removed, it can be diverted multiple times and can be used efficiently for small and medium-scale tunnel construction.

〔第2の実施形態〕
図14は、本発明の第2の実施形態における連結部材の正面断面図、図15は、同平面図である。
図14(a)及び図15(a)は、連結部材91,58によって隣接する分割型枠の補強枠材24を連結した状態を示す。本実施形態の連結部材は、上述のようなキャンバー51を使用せず、木製等の直方体形状のブロック91を使用し、このブロック91を介して隣接する補強枠材24をボルト及びナットからなる連結具58で固定している。ブロック91は、その長手方向が前後に向くように配置され、その前端部及び後端部と、補強枠材24との間には、金属製や木製等の前後一対のプレート92が挿入されている。
[Second Embodiment]
FIG. 14 is a front sectional view of a connecting member according to the second embodiment of the present invention, and FIG. 15 is a plan view thereof.
FIGS. 14A and 15A show a state in which the reinforcing frame members 24 of the adjacent divided mold frames are connected by the connecting members 91 and 58. The connecting member according to the present embodiment does not use the camber 51 as described above, but uses a block 91 having a rectangular parallelepiped shape such as wood, and the adjacent reinforcing frame member 24 is connected to the block 91 by a bolt and a nut. It is fixed with a tool 58. The block 91 is arranged so that the longitudinal direction thereof is directed forward and backward, and a pair of front and rear plates 92 made of metal or wood are inserted between the front end portion and the rear end portion and the reinforcing frame member 24. Yes.

連結部材91,58を取り外すには、図14(b)及び図15(b)に示すように、連結具58を緩め、この連結具58を中心にブロック91を約90°回転させる。これにより、ブロック91がプレート92から離脱する。そのため、プレート92の厚さ分だけ、補強枠材24とブロック91との間の隙間が増え、この状態で連結具58を取り外すことによって、隣接する補強枠材24の間からブロック91を容易に抜き取ることができる。   To remove the connecting members 91 and 58, as shown in FIGS. 14B and 15B, the connecting tool 58 is loosened, and the block 91 is rotated about 90 ° around the connecting tool 58. As a result, the block 91 is detached from the plate 92. Therefore, the gap between the reinforcing frame member 24 and the block 91 increases by the thickness of the plate 92, and the block 91 can be easily removed from between the adjacent reinforcing frame members 24 by removing the connecting tool 58 in this state. Can be extracted.

本発明は、上記実施形態に限定されることなく適宜設計変更可能である。
例えば、箱抜き型枠10を構成する分割型枠211〜216の大きさ、個数、並べ方等は、成型する箱抜き穴13の大きさや形状等に応じて適宜変更することができる。また、使用するキャンバー51やブロック91の大きさや個数についても適宜変更可能である。
The present invention is not limited to the above-described embodiment, and can be appropriately changed in design.
For example, the size, number, arrangement, etc. of the divided molds 211 to 216 constituting the boxing mold 10 can be appropriately changed according to the size, shape, etc. of the boxing hole 13 to be molded. In addition, the size and number of cambers 51 and blocks 91 to be used can be changed as appropriate.

本発明の箱抜き型枠10の構成は、木製の箱抜き型枠10だけでなく、鋼製の箱抜き型枠10にも適用することが可能である。また、本発明は、トンネル11に限らず、各種コンクリート構造物用の箱抜き型枠10として適用することができる。   The configuration of the boxing mold 10 of the present invention can be applied not only to the wooden boxing mold 10 but also to the steel boxing mold 10. The present invention is not limited to the tunnel 11 and can be applied as a boxing mold 10 for various concrete structures.

10 箱抜き型枠
11 トンネル
13 箱抜き穴
17 箱抜き穴の底面
18 底面成形部
181〜186 分割底面成形部
19 箱抜き穴の内側面
20 側面成形部
201〜206 分割側面成形部
211〜216 分割型枠
31〜38 突き合わせ面
45〜48 突き合わせ面
71〜78 突き合わせ面
DESCRIPTION OF SYMBOLS 10 Box extraction form 11 Tunnel 13 Box extraction hole 17 Bottom surface of box extraction hole 18 Bottom surface forming part 181 to 186 Division bottom surface formation part 19 Inner side surface of box extraction hole 20 Side surface formation part 201 to 206 Division side surface formation part 211 to 216 Division Formwork 31-38 Butting surface 45-48 Butting surface 71-78 Butting surface

Claims (4)

コンクリート構造物に凹状の箱抜き穴を成形するために用いられ、当該箱抜き穴の内面を成形する内面成形部を有している箱抜き型枠であって、
当該箱抜き型枠は、前記内面成形部の一部である分割内面成形部を有する複数の分割型枠から構成され、
各分割型枠の分割内面成形部は、隣接する他の分割型枠の分割内面成形部に対して突き合わされる突き合わせ面を有しており、
複数の分割型枠は、前記箱抜き穴からの脱型順序が所定に定められ、
前記突き合わせ面は、隣接する分割型枠のうち脱型順序が先行する分割型枠の分割内面成形部を前記箱抜き穴の内面から離反させる方向に沿って形成されていることを特徴とする箱抜き型枠。
A box forming mold used for forming a concave box opening hole in a concrete structure, and having an inner surface forming portion for forming the inner surface of the box opening hole,
The boxing mold is composed of a plurality of divided molds having a divided inner surface molding part which is a part of the inner surface molding part,
The divided inner surface molding portion of each divided mold has a butting surface that is abutted against the divided inner surface molded portion of another adjacent divided mold frame,
The plurality of divided molds have a predetermined order of demolding from the box opening holes,
The box is characterized in that the abutting surface is formed along a direction in which a split inner surface molding portion of a split mold that precedes the demolding order among adjacent split molds is separated from the inner surface of the box opening hole. Punching formwork.
前記分割内面成形部は、前記箱抜き穴の底面の一部を成形する分割底面成形部と、前記箱抜き穴の内側面の一部を成形する分割側面成形部とからなる請求項1に記載の箱抜き型枠。   2. The split inner surface molding portion includes a split bottom surface molding portion that molds a part of the bottom surface of the box punching hole and a split side surface molding portion that molds a part of the inner side surface of the box punching hole. Boxing formwork. 前記分割型枠は、前記分割底面成型部及び前記分割側面成形部の内側に補強枠材を備えており、
互いに隣接する分割型枠の補強枠材の間には、各分割型枠の分割底面成形部及び分割側面成型部を前記箱抜き穴の底面及び内側面から離反する方向への移動を許容とする隙間が形成されている請求項2に記載の箱抜き型枠。
The split mold has a reinforcing frame material inside the split bottom surface molding part and the split side surface molding part,
Between the reinforcing frame members of the divided molds adjacent to each other, it is allowed to move the divided bottom surface molding part and the divided side surface molding part of each divided mold frame in a direction away from the bottom surface and the inner side surface of the boxing hole. The box-opening formwork of Claim 2 in which the clearance gap is formed.
請求項1〜3のいずれかに記載の箱抜き型枠を使用してコンクリート構造物に箱抜き穴を成型する、箱抜き穴の施工方法であって、
隣接する分割型枠の分割内面成形部同士を互いに突き合わせた状態で複数の分割型枠を連結して箱抜き型枠を組み立て、この箱抜き型枠を箱抜き穴の成形部位にセットするセット工程と、
前記箱抜き型枠の周囲にコンクリートを打設して箱抜き穴を成型する成型工程と、
成型された箱抜き穴から箱抜き型枠を脱型する脱型工程とを含み、
前記脱型工程は、複数の分割型枠の連結を解く工程と、複数の分割型枠のうち、より脱型順序が先行する分割型枠を、隣接する他の分割型枠に対する前記突き合わせ面に沿った方向に移動させて箱抜き穴から取り外す工程とを含むことを特徴とする箱抜き穴の施工方法。
A boxing hole construction method for forming a boxing hole in a concrete structure using the boxing mold according to any one of claims 1 to 3,
A set process in which a plurality of divided molds are connected in a state where the divided inner surface molded portions of adjacent divided molds are abutted with each other to assemble a box-shaped mold, and this box-shaped mold is set at a molding part of a box-shaped hole When,
A molding step in which concrete is placed around the boxing mold to mold a boxing hole;
A demolding step of demolding the boxing mold from the molded boxing hole,
The demolding step includes a step of releasing the connection of a plurality of divided molds, and a divided mold that has a higher demolding order among the plurality of divided molds to the abutting surface with respect to another adjacent divided mold A method for constructing a box hole, comprising a step of moving in a direction along the line and removing it from the box hole.
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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5744064A (en) * 1980-06-28 1982-03-12 Maier Josef Form panel made up of several members to be assembled square
JPS6180939U (en) * 1984-10-31 1986-05-29
JPH05295887A (en) * 1992-04-20 1993-11-09 Ohbayashi Corp Erection method of form
JPH08218623A (en) * 1995-02-10 1996-08-27 Bungen Ri Method and equipment for overhauling concrete form
JP2001082095A (en) * 1999-07-09 2001-03-27 Hitachi Constr Mach Co Ltd Form handling machine, form, and form fitting method and form extracting method
JP4519190B1 (en) * 2009-02-11 2010-08-04 永井木工株式会社 Forming box for use in placing concrete and boxing space forming method using the same
JP2011052431A (en) * 2009-09-01 2011-03-17 Koyo Shoji Kk Blockout form and method for constructing blockout hole

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5744064A (en) * 1980-06-28 1982-03-12 Maier Josef Form panel made up of several members to be assembled square
JPS6180939U (en) * 1984-10-31 1986-05-29
JPH05295887A (en) * 1992-04-20 1993-11-09 Ohbayashi Corp Erection method of form
JPH08218623A (en) * 1995-02-10 1996-08-27 Bungen Ri Method and equipment for overhauling concrete form
JP2001082095A (en) * 1999-07-09 2001-03-27 Hitachi Constr Mach Co Ltd Form handling machine, form, and form fitting method and form extracting method
JP4519190B1 (en) * 2009-02-11 2010-08-04 永井木工株式会社 Forming box for use in placing concrete and boxing space forming method using the same
JP2011052431A (en) * 2009-09-01 2011-03-17 Koyo Shoji Kk Blockout form and method for constructing blockout hole

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