JP2011017127A

JP2011017127A - Hollow cylindrical body

Info

Publication number: JP2011017127A
Application number: JP2009160530A
Authority: JP
Inventors: Satoshi Suzuki; 郷士鈴木
Original assignee: AS GIKEN KK
Current assignee: AS GIKEN KK
Priority date: 2009-07-07
Filing date: 2009-07-07
Publication date: 2011-01-27
Anticipated expiration: 2029-07-07
Also published as: JP5489560B2

Abstract

PROBLEM TO BE SOLVED: To provide a hollow cylindrical body which determines easily and quickly whether concrete is filled sufficiently in a lower area of the hollow cylindrical body or not, when forming a composite floor plate structure by a cylindrical composite floor plate form using the hollow cylindrical body.SOLUTION: This hollow cylindrical body 1 is used in the cylindrical composite floor plate form, is provided with the first perspective window 3-1 in at least one part S1 in the body 2 of the hollow cylindrical body 1, and is provided with the second perspective window 3-2 in a portion S2 opposed, in a diametric direction of the hollow cylindrical body 1, to a portion provided with the first perspective window 3-1 in the body 2 of the hollow cylindrical body 1, and in the portion overlapped with an arranging position of the first perspective window part 3-1 in a longitudinal direction of the hollow cylindrical body 1.

Description

本発明は、中空円筒体を含む円筒型枠に使用される中空円筒体の構造に関するものである。 The present invention relates to a structure of a hollow cylinder used for a cylindrical frame including a hollow cylinder.

近年に於いては、一般に道路、鉄道或いは歩道等の通路で使用される、道路上、河川上或は谷間部等に於いて使用される橋梁（中空床版橋）として、コンクリート製の橋脚と当該橋脚間に張設される中空床版とから構成される構造が一般的となって来ている。 In recent years, concrete bridge piers are used as bridges (hollow floor slab bridges) used on roads, rivers or valleys, etc., which are generally used in roads, railways or sidewalks. A structure composed of a hollow floor slab stretched between the piers has become common.

ここで、一般の中空床版橋は、中空管が不可欠として存在しているが、その中空間の構造は円形が最も一般的であるものの、コンクリート打設の際、中空床版橋内部に於いて大きな障害物となる為、コンクリート打設時にともすると、コンクリート内部に空洞を作ってしまう危険性が多かった。 Here, in general hollow floor slab bridges, hollow pipes are indispensable, but the structure of the inner space is most commonly circular, but when placing concrete, the hollow floor slab bridges are built inside the hollow floor slab bridge. Since it becomes a big obstacle, there is a high risk of creating a cavity inside the concrete when placing concrete.

又、コンクリート打設時にコンクリートが床版の内部の隅々に打設されているかを確認する手段はなく、当該中空床版橋を建設する際の大きな問題点となっていた。 In addition, there is no means for confirming whether concrete is placed in every corner of the floor slab when placing concrete, which has been a major problem in constructing the hollow floor slab bridge.

上記した様な、床板の一部に中空円筒体を使用する円筒型床板型枠の具体的な構成の例としては、例えば、特開２００８−２１４９５９号公報（特許文献１）に開示されおり、その具体的な構造の例は、図５に示す通りであって、適宜の床板型枠１１内に縦及び緯方向に配列された複数本の鉄筋或は配力筋１０、１２等で形成された床板構成体の間に適宜の大きさの円筒中空体１が配置されている。 As an example of a specific configuration of a cylindrical floor plate form using a hollow cylindrical body as a part of the floor plate as described above, for example, it is disclosed in Japanese Patent Application Laid-Open No. 2008-214959 (Patent Document 1), An example of the specific structure is as shown in FIG. 5, and is formed by a plurality of reinforcing bars or distributing bars 10, 12, etc. arranged in an appropriate floor plate mold 11 in the longitudinal and weft directions. A cylindrical hollow body 1 having an appropriate size is disposed between the floor plate components.

特開２００８−２１４９５９号公報JP 2008-214959 A

従って本発明の目的は、上記した従来技術の欠陥を改良し、中空円筒体を使用した円筒型合成床板型枠によって合成床板構造体を形成するに際し、当該中空円筒体の下部領域にコンクリートが十分充填されたか否かを容易に且つ迅速に片段する事が可能な中空円筒体を提供するものである。 Accordingly, the object of the present invention is to improve the above-mentioned deficiencies of the prior art, and when forming a composite floorboard structure with a cylindrical composite floorboard form using a hollow cylinder, there is sufficient concrete in the lower region of the hollow cylinder. It is an object of the present invention to provide a hollow cylindrical body capable of easily and quickly single-stage whether or not it is filled.

本発明は、上記した目的を達成するため、以下に記載されたような、基本的な技術構成を採用するものである。 In order to achieve the above-described object, the present invention adopts a basic technical configuration as described below.

即ち、本発明の具体的な態様としては、床板型枠に使用される中空円筒体であって、当該中空円筒体の本体部に於ける少なくとも一部に第１の透視窓部が設けられていると共に、当該中空円筒体の当該第１の透視窓部が設けられている部位と当該中空円筒体の直径方向に於いて対向する部位であって、且つ当該中空円筒体の長手方向に沿った当該第１の透視窓部の配置位置と重複する部位に第２の透視窓部が設けられていることを特徴とする中空円筒体である。 That is, as a specific aspect of the present invention, there is provided a hollow cylindrical body used for a floor plate formwork, wherein a first see-through window portion is provided at least in a main body portion of the hollow cylindrical body. And a portion of the hollow cylindrical body that is opposed to the portion of the hollow cylindrical body in the diameter direction of the hollow cylindrical body and along the longitudinal direction of the hollow cylindrical body. A hollow cylindrical body characterized in that a second fluoroscopic window portion is provided in a portion overlapping with the arrangement position of the first fluoroscopic window portion.

本発明に係る当該中空円筒体は、上記した技術構成を採用下結果、従来技術の欠陥を改良し、中空円筒体を使用した円筒型合成床板型枠によって合成床板構造体を形成するに際し、当該中空円筒体の下部領域にコンクリートが十分充填されたか否かを容易に且つ迅速に判断する事が可能となり、然も、コンクリートを注入する際に当該中空円筒体の片方からのみ注入する必要は無く、全体的に同時にコンクリートを注入する事が可能となるので、作業効率が向上すると同時に、作業者が絶えず当該中空円筒体の下方部にコンクリートが充填されたか否かを監視する必要が無く、したがって更なる作業効率の向上と労務コストの低減を実現出来るという優れた作用効果を発揮できる。 When the hollow cylindrical body according to the present invention adopts the above-described technical configuration, as a result of improving the defects of the prior art, and forming a synthetic floorboard structure with a cylindrical synthetic floorboard formwork using the hollow cylindrical body, It is possible to easily and quickly determine whether or not the concrete in the lower area of the hollow cylinder is sufficiently filled, and it is not necessary to inject only from one side of the hollow cylinder when injecting concrete. Since it is possible to inject concrete at the same time as a whole, the work efficiency is improved, and at the same time, it is not necessary for the operator to constantly monitor whether or not the concrete is filled in the lower part of the hollow cylindrical body. It is possible to achieve an excellent effect of further improving work efficiency and reducing labor costs.

図１（Ａ）及び図１（Ｂ）は、本発明に係る中空円筒体の一具体例の構成を示す側面図及び断面図である。FIG. 1A and FIG. 1B are a side view and a cross-sectional view showing a configuration of a specific example of a hollow cylindrical body according to the present invention. 図２は、本発明に係る中空円筒体の一具体例の構成を示す斜視図である。FIG. 2 is a perspective view showing the configuration of a specific example of the hollow cylindrical body according to the present invention. 図３は、本発明に係る中空円筒体の一具体例の内部の構成を示す斜視図である。FIG. 3 is a perspective view showing an internal configuration of a specific example of the hollow cylindrical body according to the present invention. 図４は、本発明に係る中空円筒体に於ける透視窓部の構成の例を説明する断面図である。FIG. 4 is a cross-sectional view for explaining an example of the configuration of the see-through window part in the hollow cylindrical body according to the present invention. 図５は、円筒型合成床板型枠の具体例の構成を説明する斜視図である。FIG. 5 is a perspective view illustrating the configuration of a specific example of the cylindrical synthetic floor board formwork.

以下に本発明に係る中空円筒体の具体例を図面を参照しながら詳細に説明する。 Specific examples of the hollow cylinder according to the present invention will be described in detail below with reference to the drawings.

即ち、図１（Ａ）及び図１（Ｂ）は、本発明に於ける中空円筒体１の構造の一具体例を示す側面図及び断面図であって、図中、円筒型合成床板型枠１０に使用される中空円筒体１であって、当該中空円筒体１の本体部２に於ける少なくとも一部Ｓ１に第１の透視窓部３−１が設けられていると共に、当該中空円筒体１の当該本体部２の当該第１の透視窓部３−１が設けられている部位と当該中空円筒体１の直径方向に於いて対向する部位Ｓ２であって、且つ当該中空円筒体１の長手方向に沿った当該第１の透視窓部３−１の配置位置と重複する部位に第２の透視窓部３−２が設けられていることを特徴とする中空円筒体１が示されている。 1A and 1B are a side view and a cross-sectional view showing a specific example of the structure of the hollow cylindrical body 1 in the present invention, in which a cylindrical synthetic floor plate formwork is shown. The hollow cylindrical body 1 is used in the first cylindrical window 3-1, and at least a part S1 of the main body 2 of the hollow cylindrical body 1 is provided with a first see-through window 3-1. A portion S2 of the main body 2 opposite to the portion where the first see-through window portion 3-1 is provided in the diameter direction of the hollow cylindrical body 1, and the hollow cylindrical body 1 Shown is a hollow cylindrical body 1 in which a second fluoroscopic window portion 3-2 is provided in a portion overlapping with the arrangement position of the first fluoroscopic window portion 3-1 along the longitudinal direction. Yes.

本発明に於ける当該中空円筒体１は、適宜の硬性材料から形成されたもので、その材質は特に限定されるものではないが、例えば、鉄、アルミ、銅、ステンレス等の金属材料、合成樹脂、炭素繊維等を含む複合合成樹脂等から形成されるものである。又、当該中空円筒体１の直径や長さも特に特定されるものではなく、施工現場の工事設計に従って適宜選択して決定する事が可能である。 The hollow cylindrical body 1 in the present invention is formed from an appropriate hard material, and the material is not particularly limited. For example, a metal material such as iron, aluminum, copper, and stainless steel, or a synthetic material is used. It is formed from composite synthetic resin etc. containing resin, carbon fiber, etc. Further, the diameter and length of the hollow cylindrical body 1 are not particularly specified, and can be appropriately selected and determined according to the construction design at the construction site.

又、当該中空円筒体１は、予め定められた長さを持つ、複数種類の直径を持つ中空円筒体ユニットとして形成しておき、当該中空円筒体ユニットを適宜連結して使用することも可能である。 Further, the hollow cylindrical body 1 can be formed as a hollow cylindrical body unit having a predetermined length and a plurality of types of diameters, and the hollow cylindrical body unit can be used by being appropriately connected. is there.

本発明に係る当該中空円筒体１に設けられる当該第１の透視窓部３−１と当該第２の透視窓部３−２の一方が、コンクリートが当該中空円筒体１の下部領域を完全に充填しているか否かを検出する為の検出用窓部であり、その他方の当該第２の透視窓部３−２が観察用窓部であって、作業者が当該第２の透視窓部３−２から当該第１の透視窓部３−１を当該中空円筒体１の外部から覗き込み、当該第１の透視窓部３−１が外部からの光を完全に遮断しているか否かを判断し、当該第１の透視窓部３−１から全く光が漏れていない場合には、コンクリートが当該中空円筒体１の下部領域Ｗが完全にコンクリートで充填されていると判断するものである。 One of the first see-through window part 3-1 and the second see-through window part 3-2 provided in the hollow cylindrical body 1 according to the present invention is such that concrete completely covers the lower region of the hollow cylindrical body 1. It is a detection window part for detecting whether or not it is filled, and the other second see-through window part 3-2 is an observation window part, and an operator makes the second see-through window part. Whether the first see-through window part 3-1 is looked into from the outside of the hollow cylindrical body 1 from 3-2, and the first see-through window part 3-1 completely blocks the light from the outside. In the case where no light leaks from the first see-through window part 3-1, it is determined that the lower region W of the hollow cylindrical body 1 is completely filled with concrete. is there.

当該第１及び第２の透視窓部３−１、３−２の開口部の形状は同じであって、且つその面積も同じである事が望ましく、係る構成にしておく事によって、当該中空円筒体１を当該円筒型合成床板型枠１０内に設置する際に、何れかの当該透視窓部３−１又は３−２を当該円筒型合成床板型枠１０の底部に向けて配置、固定する事が出来る。係る操作上の効率を考慮しない場合には、当該第１及び第２の透視窓部３−１、３−２の開口部の形状やその面積は相互に異ならしておく事も可能であり、その場合には、当該検出用の第１の透視窓部３−１の開口部の面積の方を、当該観察用である第２の透視窓部３−２の開口部の面積よりも大きくしておく事が望ましい。 It is desirable that the openings of the first and second see-through window portions 3-1 and 3-2 have the same shape and the same area. When the body 1 is installed in the cylindrical synthetic floor board mold 10, any one of the see-through window portions 3-1 or 3-2 is arranged and fixed toward the bottom of the cylindrical synthetic floor board mold 10. I can do it. If the operational efficiency is not taken into consideration, the shapes and areas of the openings of the first and second fluoroscopic windows 3-1 and 3-2 can be different from each other. In that case, the area of the opening of the first fluoroscopic window portion 3-1 for detection is made larger than the area of the opening of the second fluoroscopic window portion 3-2 for observation. It is desirable to keep it.

一方、当該第１及び第２の透視窓部３−１、３−２は、当該中空円筒体１の長手方向に複数個設定する事が可能であり、又上記した様に、当該中空円筒体１をユニット型にして使用する場合には、一部の当該中空円筒体ユニットには、当該第１及び第２の透視窓部３−１、３−２を設けない様にしても良い。 On the other hand, a plurality of the first and second see-through window portions 3-1 and 3-2 can be set in the longitudinal direction of the hollow cylindrical body 1, and as described above, the hollow cylindrical body. When using 1 as a unit type, some of the hollow cylindrical body units may not be provided with the first and second see-through window portions 3-1 and 3-2.

一方、本発明に於ける、当該第１及び第２の透視窓部３−１，３−２は、透光性を有する強化ガラス、硬質ガラス或は合成樹脂部材で構成された遮蔽部材５により遮蔽されている事が望ましい。当該遮蔽部材５は、少なくとも透光性を有するものであるが、当該遮蔽部材５は、色付きとする為に適宜の色素を含んでいても良い。更に、当該遮蔽部材５は、当該透視窓部３−１及び３−２の開口部２０を当該中空円筒体１の内部から遮蔽する様に構成されていても良く或は当該中空円筒体１の外表面から遮蔽する様に構成されたものであっても良い。本発明に於いては、コンクリートによる外圧を考慮すると、後者の構造の方が望ましい。 On the other hand, in the present invention, the first and second see-through window portions 3-1 and 3-2 are formed by a shielding member 5 made of translucent tempered glass, hard glass or synthetic resin member. It is desirable to be shielded. The shielding member 5 has at least translucency, but the shielding member 5 may contain an appropriate pigment for coloring. Further, the shielding member 5 may be configured to shield the openings 20 of the see-through window portions 3-1 and 3-2 from the inside of the hollow cylindrical body 1 or the hollow cylindrical body 1 of the hollow cylindrical body 1. It may be configured to shield from the outer surface. In the present invention, the latter structure is preferable in consideration of the external pressure due to concrete.

更に、本発明に於いては、当該遮蔽部材５は、当該中空円筒体１の外部壁表面１５が有する曲率と同じ曲率を有する様に構成されており、且つ当該遮蔽部材５の厚みが５ｍｍ以下である事が望ましい。又、当該遮蔽部材５と当該中空円筒体１の当該透視窓部３−１，３−２の周辺部との接合部には、適宜の周知の防水処理６が施されている事も望ましい。又、本発明に於ける、当該遮蔽部材５は、破断強度（面耐圧）が当該中空円筒体１を構成する材料と同等若しくはそれ以上である事が望ましい。 Furthermore, in this invention, the said shielding member 5 is comprised so that it may have the same curvature as the curvature which the outer wall surface 15 of the said hollow cylindrical body 1 has, and the thickness of the said shielding member 5 is 5 mm or less. It is desirable that In addition, it is also desirable that an appropriate well-known waterproofing treatment 6 is applied to a joint portion between the shielding member 5 and the peripheral portion of the see-through window portions 3-1 and 3-2 of the hollow cylindrical body 1. In the present invention, the shielding member 5 desirably has a breaking strength (surface pressure resistance) equal to or higher than that of the material constituting the hollow cylindrical body 1.

本発明に於ける、補強を兼ねるために、当該透視窓部３−１は、当該中空円筒体１内部に配置されている補助フレーム４の配置位置の近傍若しくはそれと重複した位置に設けられている事も好ましい具体例である。或は、当該中空円筒体１を当該円筒型合成床板型枠内の底部に固定する際に使用される金属或は合成樹脂製ベルト２１の配列位置の近傍或は当該ベルトの重複する位置に設ける事が望ましい。 In order to serve as reinforcement in the present invention, the see-through window portion 3-1 is provided in the vicinity of the position where the auxiliary frame 4 disposed in the hollow cylindrical body 1 is disposed or in a position overlapping with it. This is also a preferable specific example. Alternatively, the hollow cylindrical body 1 is provided in the vicinity of the arrangement position of the metal or synthetic resin belt 21 used when the hollow cylindrical body 1 is fixed to the bottom of the cylindrical synthetic floor plate form frame or at a position where the belt overlaps. Things are desirable.

一方、例えば、少なくとも検出用に使用される当該透視窓部３−１は、当該中空円筒体１の円筒状外壁部１５に形成されている当該検出用窓部３−１の当該円筒状外壁部１５に沿った円弧の長さは、当該検出用窓部３−１に於ける中央部を最下点Ｐに配置した際に、当該検出用窓部３−１の両端部Ｔと当該最下点Ｐとの距離Ｓが少なくとも１０ｍｍとなる様に設計されている事が望ましい。 On the other hand, for example, at least the see-through window part 3-1 used for detection is the cylindrical outer wall part of the detection window part 3-1, which is formed on the cylindrical outer wall part 15 of the hollow cylindrical body 1. The length of the arc along the line 15 corresponds to the end T of the detection window 3-1 and the bottom when the center of the detection window 3-1 is disposed at the lowest point P. It is desirable that the distance S to the point P is designed to be at least 10 mm.

尚、本発明に係る当該中空円筒体１は、適宜のベルト部材及び締め付け部材を使用した当該円筒型合成床板型枠の底部に固定されるものである。 In addition, the said hollow cylindrical body 1 which concerns on this invention is fixed to the bottom part of the said cylindrical synthetic floor board formwork which uses a suitable belt member and a fastening member.

一方、本発明に於ける当該中空円筒体１は所定の長さと直径を有する複数個のユニット中空円筒体として構成しても良く、係る当該複数個のユニット中空円筒体を、工事現場に於ける必要とされる当該中空円筒体１の長さに応じて、適宜の個数のユニット中空円筒体を直列的に連結して使用する事が出来る。 On the other hand, the hollow cylinder 1 in the present invention may be configured as a plurality of unit hollow cylinders having a predetermined length and diameter, and the plurality of unit hollow cylinders are used at a construction site. Depending on the required length of the hollow cylinder 1, an appropriate number of unit hollow cylinders can be connected in series and used.

又、本発明に係る当該中空円筒体１は、所定の長さを有する複数個のユニット中空円筒体として形成されており、且つ当該ユニット中空円筒体は、所定の直径と所定の長さを有し、均等に３分割された３個の円弧部材３０が組み合わされて形成されるものであって、然も、当該３個に分割して形成された当該円弧部材３０の少なくとも１つの円弧部材３０には、少なくとも１個の水抜き部材１６が設けられている。 The hollow cylinder 1 according to the present invention is formed as a plurality of unit hollow cylinders having a predetermined length, and the unit hollow cylinder has a predetermined diameter and a predetermined length. In addition, three arc members 30 that are equally divided into three are formed in combination, and of course, at least one arc member 30 of the arc member 30 that is divided into three pieces. Is provided with at least one water draining member 16.

当該水抜き部材１６は、図１にも示されている通り、当該当該ユニット中空円筒体を構成する少なくとも１つの円弧部材の略中央部に１個設けられており、場合によっては、図示の通り、複数個の当該水抜き部材１６が、略同じ位置で近接して平行に配列されている事も望ましい。係る水抜き部材１６は、全ての円弧部材に同じ形状で設けられていても良く、或は、各円弧部材のそれぞれに異なる部位で異なる個数の水抜き部材１６が設けられても良い。 As shown in FIG. 1, one water draining member 16 is provided at a substantially central portion of at least one arc member constituting the unit hollow cylindrical body. It is also desirable that the plurality of water draining members 16 are arranged in parallel at close proximity at substantially the same position. The draining member 16 may be provided in the same shape on all the arc members, or different numbers of the draining members 16 may be provided in different parts of each arc member.

当該水抜き部材１６は、特に上記した補助フレーム４が配置される予定の部位に設けておく事が望ましく、それによって、当該中空円筒体１内に発生したか浸入した水が、当該補助フレーム４で阻止されることなく、当該補助フレーム４の下端部に形成された当該水抜き部材１６を介して下流方向に流れる事が出来る。そして、当該水は、当該中空円筒体１の端部に設けられた適宜のドレイン部から外部に排出されることになる。 The water draining member 16 is particularly preferably provided at a portion where the auxiliary frame 4 is to be disposed, so that the water generated or infiltrated in the hollow cylindrical body 1 is allowed to flow into the auxiliary frame 4. Without being blocked by the flow, the water can flow in the downstream direction through the water draining member 16 formed at the lower end of the auxiliary frame 4. And the said water is discharged | emitted outside from the appropriate drain part provided in the edge part of the said hollow cylindrical body 1. FIG.

更に、当該水抜き部材１６は、当該ユニット中空円筒体の当該円弧部両端部に設けられている事が望ましく、当該ユニット中空円筒体の当該円弧部３０の両端部に設けられる当該水抜き部材１６の長さは、当該当該円弧部材３０の内部側に設けられる当該水抜き部材１６の長さの半分とする事が好ましい。本発明に於いては、複数個の当該中空円筒体ユニットを相互に連結する際に、当該隣接する各中空円筒体ユニットの各端部に形成された当該水抜き部材１６が相互に位置合わせされる様に配置されている事が望ましく、当該水抜き部材１６が当該中空円筒体１の最下端部Ｐとなる様に配置する事が望ましい。それによって、当該複数個の中空円筒体ユニットが当該水抜き部材１６を相互連結する様に接続され、その結果、長尺状に形成された当該中空円筒体１の内部に一つの連続した排水路が形成される事になる。 Further, the drainage member 16 is desirably provided at both ends of the arc portion of the unit hollow cylinder, and the drainage member 16 provided at both ends of the arc portion 30 of the unit hollow cylinder. Is preferably half the length of the water draining member 16 provided on the inner side of the arc member 30. In the present invention, when the plurality of hollow cylinder units are connected to each other, the water draining members 16 formed at the ends of the adjacent hollow cylinder units are aligned with each other. It is desirable that the water draining member 16 be disposed at the lowermost end portion P of the hollow cylindrical body 1. Thereby, the plurality of hollow cylindrical body units are connected so as to interconnect the water draining members 16, and as a result, one continuous drainage channel is formed in the hollow cylindrical body 1 formed in an elongated shape. Will be formed.

本発明に係る当該中空円筒体１は、円筒型合成床板型枠の中空円筒体として有効に使用され、軽量化された、低コストで作業効率を向上させる合成床板構造体の形成に貢献するものである。 The hollow cylindrical body 1 according to the present invention is effectively used as a hollow cylindrical body of a cylindrical synthetic floor board formwork and contributes to the formation of a synthetic floor board structure that is reduced in weight and improves work efficiency at low cost. It is.

１ …中空円筒体
２ …本体部
３−１…第１の透視窓部
３−２…第２の透視窓部
４ …補助フレーム
５ …遮蔽部材
６ …防水処理部
１０ …円筒型合成床板型枠
１５ …外部壁表面
１６ …水抜き部材
２０ …開口部
２１ …ベルト
３０ …円弧部材 DESCRIPTION OF SYMBOLS 1 ... Hollow cylindrical body 2 ... Main-body part 3-1 ... 1st see-through window part 3-2 ... 2nd see-through window part 4 ... Auxiliary frame 5 ... Shielding member 6 ... Waterproofing processing part 10 ... Cylindrical synthetic floor board formwork DESCRIPTION OF SYMBOLS 15 ... External wall surface 16 ... Drain member 20 ... Opening part 21 ... Belt 30 ... Arc member

Claims

A hollow cylindrical body used for a floor plate formwork, wherein a first see-through window portion is provided at least at a part of a main body portion of the hollow cylindrical body, and the first cylindrical body is provided with the first transparent window portion. The portion where the fluoroscopic window portion is provided and the portion facing in the diameter direction of the hollow cylindrical body and overlaps with the arrangement position of the first fluoroscopic window portion along the longitudinal direction of the hollow cylindrical body A hollow cylindrical body characterized in that a second see-through window portion is provided at a portion to be operated.

2. The hollow cylindrical body according to claim 1, wherein one of the first transparent window portion and the second transparent window portion is a detection window portion, and the other is an observation window portion.

The hollow cylindrical body according to claim 1 or 2, wherein the opening areas of the first and second see-through window portions are different from each other.

The first and second see-through window portions are shielded by a shielding member made of light-transmitting hard glass, tempered glass, or a synthetic resin member. A hollow cylinder according to any one of the above.

The shielding member is configured to have the same curvature as that of the outer wall surface of the hollow cylindrical body, and covers the transparent window portion from the outer wall surface of the hollow cylindrical body. The hollow cylinder according to claim 4, wherein

The hollow cylinder according to claim 4 or 5, wherein the thickness is 5 mm or less.

The hollow cylinder according to any one of claims 4 to 6, wherein a waterproof treatment is applied to a joint portion between the shielding member and the peripheral portion of the transparent window portion of the hollow cylinder.

The hollow cylindrical body according to any one of claims 4 to 7, wherein the shielding member has a breaking strength (surface pressure resistance) equal to or higher than a material constituting the hollow cylindrical body.

The hollow cylindrical body according to any one of claims 1 to 8, wherein the see-through window portion is provided at a position overlapping with a position where an auxiliary frame is disposed inside the hollow cylindrical body.

The length of the arc along the cylindrical outer wall portion of the detection window portion formed on the cylindrical outer wall portion of the hollow cylindrical body is arranged with the center portion of the detection window portion at the lowest point. The hollow cylindrical body according to any one of claims 1 to 9, wherein the hollow cylindrical body is designed so that a distance between the both end portions of the detection window portion and the lowest point is at least 10 mm. .

The hollow cylindrical body is formed as a plurality of unit hollow cylindrical bodies having a predetermined length, and the unit hollow cylindrical body has a predetermined diameter and a predetermined length and is equally divided into three. In addition, three arc members are formed in combination, and at least one arc member of the arc member formed by dividing the arc member is divided into at least one water draining member. The hollow cylindrical body according to claim 1, wherein the hollow cylindrical body is provided.

The hollow cylinder according to claim 11, wherein the water draining member is provided at a central portion in a longitudinal direction of the arc portion of the unit hollow cylinder and both ends of the arc portion.

When connecting a plurality of the unit hollow cylinders to each other, the drainage members formed at the ends of the adjacent unit hollow cylinders are connected so that they are aligned with each other. The hollow cylindrical body according to claim 11 or 12, characterized in that: