JP3169505U

JP3169505U - Blasting and removal coating dust scattering prevention system for open blasting method on bridges

Info

Publication number: JP3169505U
Application number: JP2011002841U
Authority: JP
Inventors: 美洋佐藤; 幸一小泉; 次美岡部; 義勝笹子
Original assignee: DAIICHI CUTTER CORPORATION
Current assignee: DAIICHI CUTTER CORPORATION
Priority date: 2011-05-23
Filing date: 2011-05-23
Publication date: 2011-08-04
Anticipated expiration: 2021-05-23

Abstract

【課題】橋梁におけるオープンブラスト工法において、鋼製部の添接板や対傾構のボルト回りなどの施工部位毎に当該施工部位を部分的に簡易に取り囲み、ブラスト材や粉塵の飛散を確実に防止するとともにその完全な回収を実現するブラスト材・除去塗膜粉塵飛散防止システムを提供する。【解決手段】このシステムＳは、主桁ウェブの左右両側の施工部位Ｐ毎に、その周囲に、マグネット式の取付ベース、取付ブラケットを有するジャッキ２５付きの建枠２などにより、ボルト止めで、カバーパネル３、カバーシートを張って、囲いＳ１を作り、囲いＳ１内の足場上に受皿８を置いてその足場上を覆う。【選択図】図１[PROBLEMS] In an open blasting method for bridges, the construction site, such as a steel plate attachment plate and a counter-inclined bolt, is surrounded by the construction site in a simple manner to reliably prevent blasting material and dust from scattering. In addition, a blasting material and removal coating dust scattering prevention system that realizes the complete recovery is provided. This system S is bolted by a building frame 2 with a jack 25 having a mounting base of a magnet type and a mounting bracket around each construction site P on both the left and right sides of the main girder web, A cover panel 3 and a cover sheet are stretched to form an enclosure S1, and a tray 8 is placed on the scaffolding in the enclosure S1 to cover the scaffolding. [Selection] Figure 1

Description

本考案は、橋梁におけるオープンブラスト工法に用いるブラスト材・除去塗膜粉塵飛散防止システムに関する。 The present invention relates to a blasting material / removed coating film dust scattering prevention system used in an open blasting method for bridges.

一般に、橋梁の主要部、特に橋桁部分には鋼材が用いられる。例えば、プレートガーダー橋は、周知のとおり、断面Ｉ形の鋼製の主桁が平行に配列され、これに端対傾構、中間対傾構、分配横桁などの鋼製の横部材が連結された構造になっている。
これらの鋼材は、耐久性向上のために、塗装が施される。
ところで、この塗装は長期に亘って使用されていると、気候などの環境の影響を受けて塗膜が劣化し、剥落したり、錆や変退色が発生したりし、また、車両の排気ガスや工場の排煙などが塗装表面に付着して黒ずんだ汚れが生じたりするため、この対策として、多くの場合、再塗装が定期的に施される。そして、この再塗装の前に、素地調整のために塗膜表面から古い塗膜を除去して塗装に適した面を形成する作業、所謂ケレン作業が行われる。この作業では、ブラストマシンなどを使ってブラスト材を塗装面に衝突させ、その衝撃力で、塗装面の塗膜を研削し除去することが行われている。この作業の場合、塗装面の周囲に多くのブラスト材や除去塗膜が飛散するため、これらブラスト材や粉塵の飛散を防止する必要がある。橋梁における従来のオープンブラスト工法では、粉塵の外部への飛散を防ぐために、防護カバーを厳重に設置することが求められ、橋梁の鋼製部全体をシート等で覆い養生することが一般に行なわれている（例えば、特許文献１参照。）。 Generally, steel is used for the main part of the bridge, especially the bridge girder. For example, in a plate girder bridge, as is well known, steel main girders having an I-shaped cross section are arranged in parallel, and steel transverse members such as end-to-end tilting, intermediate pair tilting, and distribution cross-girder are connected thereto. It has a structure.
These steel materials are painted to improve durability.
By the way, if this paint is used for a long period of time, the coating film deteriorates due to the influence of the environment such as the climate, peels off, rust and discoloration occur, and vehicle exhaust gas. In many cases, re-painting is performed regularly as a countermeasure against this, as the smoke from the factory or factory smoke may adhere to the painted surface and cause dark stains. And before this repainting, the operation | work which removes an old coating film from the coating film surface for base preparation, and forms the surface suitable for coating, what is called a keren operation | work is performed. In this work, a blasting machine is used to collide a blasting material with a painted surface, and the paint film on the painted surface is ground and removed by the impact force. In the case of this work, since many blast materials and removal coatings are scattered around the painted surface, it is necessary to prevent the blast materials and dust from being scattered. In the conventional open blasting method for bridges, in order to prevent dust from scattering to the outside, it is required to install a protective cover strictly, and the entire steel part of the bridge is generally covered with a sheet and cured. (For example, refer to Patent Document 1).

特開２００８−２９０２１１公報JP 2008-290211 A

しかしながら、橋梁におけるオープンブラスト工法において、従来のように、橋梁の鋼製部全体をシート等で覆うだけでは、次のような問題がある。
（１）橋梁の鋼製部全体をシート等で覆っていても、例えば添接板や対傾構などの施工部位各所がそれぞれオープンになっていて、しかも、これらの部位の特にボルト回りを始めとして、狭隘部、凹部、凸部などでは、作業が容易でなく、作業に要する時間も長くなるため、施工部位周辺がブラスト材や除去塗膜により汚染されることは避けられない。この場合、ブラスト材にスチールグリットを用いていると、スチールグリットが飛散してその完全な回収が難しいため、足場下面などで発錆し、錆被害をもたらすことになる。また、このようなスチールグリットによる汚染を回避するために、ブラスト材にスチールグリット以外の非金属系噴射材を使用しようとすると、こんどは、施工部位でのケレン能力が劣化するため、作業効率が悪くなる。
（２）首都高速道路などの首都圏の橋梁では、オープンブラスト工法の場合、このような粉塵及び噴射材の飛散が問題になっており、１種ケレンによる施工は行なわれず２種ケレンでの施工が主流となるために、ボルト回り等の狭隘部は電動工具で１人およそ１ｍ²前後
の効率に留まり、このため、作業効率の向上が望まれている。 However, in the open blast method for a bridge, there is the following problem if the entire steel part of the bridge is covered with a sheet or the like as in the prior art.
(1) Even if the entire steel part of the bridge is covered with a sheet or the like, for example, the construction parts such as the attachment plate and the tilting structure are open, and these parts, especially around the bolts, etc. In the narrow part, the concave part, the convex part, and the like, the work is not easy and the time required for the work becomes long. Therefore, it is inevitable that the periphery of the construction site is contaminated with the blast material or the removed coating film. In this case, when steel grit is used for the blast material, the steel grit is scattered and it is difficult to completely recover the steel grit. In addition, in order to avoid such contamination by steel grit, if non-metallic injection material other than steel grit is used for blasting material, the work efficiency will be reduced because the ability of kelen at the construction site will deteriorate. Deteriorate.
(2) For bridges in the Tokyo metropolitan area, such as the Metropolitan Expressway, in the case of the open blast method, such dust and spray material scattering is a problem. Therefore, the narrow part such as around the bolt is limited to an efficiency of about 1 m ² per person with an electric power tool, and therefore it is desired to improve the working efficiency.

本考案は、このような従来の課題を解決するもので、橋梁におけるオープンブラスト工法において、鋼製部の添接板や対傾構などボルト、狭隘部、凹部、凸部を含む施工部位毎に当該施工部位を部分的に簡易に取り囲み、スチールグリットを含むブラスト材や塗膜除去粉塵の飛散を確実に防止するとともに、その完全な回収を実現し、ブラスト材にスチールグリットを使用できるようにして当該施工部位の施工の能率及び品質の向上を図ることのできるブラスト材・除去塗膜粉塵飛散防止システムを提供すること、を目的とする。 The present invention solves such a conventional problem, and in the open blasting method for bridges, the construction parts including bolts, narrow parts, concave parts, and convex parts such as steel plate attachment plates and anti-tilt structures are applied. The construction site is partly easily surrounded, and the blasting material containing steel grit and coating film removal dust are surely prevented, and the complete recovery of the blasting material and the steel grit can be used for the blasting material. An object of the present invention is to provide a blasting material / removed coating film dust scattering prevention system capable of improving the efficiency and quality of construction of a construction site.

上記目的を達成するために、本考案は、橋梁におけるオープンブラスト工法において橋梁の鋼製部のボルト、狭隘部、凹部、凸部を含む施工部位毎に組み立て設置して、ブラスト材・除去塗膜粉塵の飛散を防止する橋梁におけるオープンブラスト工法に用いるブラスト材・除去塗膜粉塵飛散防止システムであって、マグネットからなる固定部、及び前記固定部に一端が固定されて前記固定部から延び、ボルト挿通穴を具備する取付ブラケットを有する複数の取付ベースと、縦方向に延びる一対の支柱及び前記各支柱間に架け渡される連結杆からなり、前記鋼製部に対して略平行に設置可能な上下２段構成の少なくとも１組の建枠、前記上段の建枠の各支柱の上下部間所定の位置に一端が前記連結杆に対して水平方向の直角に突出するように取り付けられ、当該一端に上下に長いボルト挿通穴を有する複数の第１の取付ブラケット、及び前記上段の建枠の各支柱の上下部間所定の位置に少なくとも一端が前記連結杆に対して平行に前記各支柱間に突出するように取り付けられ、当該一端に上下に長いボルト挿通穴を有する複数の第２の取付ブラケットと、前記各支柱の一部に設けられ、前記建枠全体の高さを調整するための複数のジャッキと、耐衝撃性、加工性に優れるエンジニアリングプラスチックにより、前記各取付ベースと前記上段の建枠の各支柱との間に配置可能に所定の大きさを有する平板状に形成され、前記各取付ベースの前記取付ブラケット及び前記上段の建枠の前記各第１の取付ブラケットの各ボルト挿通穴に対応する複数のボルト通し穴を有する少なくとも２枚の第１のカバーパネル、及び前記エンジニアリングプラスチックにより、前記上段の建枠の各支柱間に配置可能に所定の大きさを有する平板状に形成され、前記上段の建枠の前記各第２の取付ブラケットの各ボルト挿通穴に対応する複数のボルト通し穴を有する少なくとも１枚の第２のカバーパネルと、前記各第１のカバーパネルにシート止め部材により固定され、前記各第１のカバーパネルの下方に垂下される第１のカバーシート、及び前記第２のカバーパネルにシート止め部材により固定され、前記第２のカバーパネルの下方に垂下される第２のカバーシートと、所定の平面積を有する受皿とを備え、前記複数の取付ベースを前記固定部のマグネットにより当該施工部位の左右両側にそれぞれ縦一列に取り付けて、前記取付ブラケットを正面に向けて突出させ、前記上下２段構成の建枠を当該施工部位の正面側に当該施工部位に対して平行に、かつ前記上段の建枠の各支柱の前記各第１の取付ブラケットを当該施工部位側に向けて、前記各第２のブラケットを前記各支柱間に突出させて、前記建枠の高さを前記ジャッキにより調整して設置し、前記各取付ベースと前記上段の建枠の各支柱との間に前記各第１のカバーパネルを配置し、前記各第１のカバーパネルの前記各ボルト通し穴を前記各取付ベースの前記取付ブラケット及び前記各第１の取付ブラケットの各ボルト挿通穴に合わせて、ボルトを通しナットに締め込むことにより取り付けるとともに、前記上段の建枠の各支柱間に前記第２のカバーパネルを配置し、前記第２のカバーパネルの前記各ボルト通し穴を前記各第２の取付ブラケットの各ボルト挿通穴に合わせて、ボルトを通しナットに締め込むことにより取り付け、併せて、前記各第１のカバーパネルに前記第１のカバーシートを前記シート止め部材により固定して、前記各第１のカバーパネルの下方に垂下するとともに、前記第２のカバーパネルに前記第２のカバーシートを前記シート止め部材により固定して、前記第２のカバーパネルの下方に垂下し、前記建枠、前記各第１のカバーパネル、前記第２のカバーパネル、及び前記第１、第２の各カバーシートにより包囲される空間の下部平面全面に前記受皿を置き、当該施工部位を、前記各取付ベース、前記建枠、前記各カバーパネル、及び前記各カバーシートにより、水平断面略コ字形に取り囲み遮蔽して、ブラスト作業時のブラスト材・除去塗膜粉塵の飛散を防止し、当該施工部位直下を前記受皿で覆い、前記受皿でブラスト作業時のブラスト材・除去塗膜粉塵を回収する、ことを要旨とする。
このシステムでは、さらに次のような構成を備えることが好ましい。
（１）各シート止め部材にフラットバーが採用され、前記フラットバーを第１、第２のカバーパネルにそれぞれボルト及びナットにより取り付けて、第１、第２のカバーシートを、前記各カバーパネルと前記フラットバーとの間に挟み固定する。
（２）各第１のカバーパネルの下部に、前記各第１のカバーパネルに直接又は当該施工部位の鋼材に取付ベースを固定してこの取付ベースを介してボルト及びナットにより取り付ける耐衝撃性、加工性に優れるエンジニアリングプラスチックからなる補助カバーパネルを併せて備え、この補助カバーパネルで前記各第１のカバーパネルの下方を部分的に遮蔽する。
（３）第１、第２のカバーパネルの上部に生じる隙間を塞ぐためのパッキンを併せて備え、前記隙間を前記パッキンで密閉する。
（４）上記の各部材を２組ずつ備え、上記の各部材を当該施工部位の表裏両面を取り囲み覆うように当該施工部位の表裏両面側に対称的に組み立て設置する。 In order to achieve the above object, the present invention is an open blasting method for bridges, which is assembled and installed for each construction site including bolts, narrow parts, concave parts, and convex parts of the steel part of the bridge. A blasting material / removed coating film dust scattering prevention system used in the open blasting method for bridges to prevent dust scattering, including a magnet fixed part, and one end fixed to the fixed part and extending from the fixed part. A plurality of mounting bases having mounting brackets having insertion holes, a pair of columns extending in the vertical direction, and a connecting rod spanning between the columns. At least one set of building frames having a two-stage structure, with one end projecting at a right angle in the horizontal direction with respect to the connecting rod at a predetermined position between the upper and lower portions of each column of the upper building frame. A plurality of first mounting brackets having upper and lower bolt insertion holes at one end and a predetermined position between the upper and lower portions of each column of the upper building frame, at least one end being parallel to the connecting rod A plurality of second mounting brackets that are attached so as to protrude between the columns and have a bolt insertion hole that is long at the top and bottom at one end thereof, are provided in a part of the columns, and the height of the entire building frame is increased. With a plurality of jacks for adjustment and engineering plastics with excellent impact resistance and workability, it is a flat plate having a predetermined size so that it can be placed between each mounting base and each column of the upper building frame. And at least two bolt through holes corresponding to the respective bolt insertion holes of the mounting brackets of the mounting bases and the first mounting brackets of the upper building frame. The cover panel and the engineering plastic are formed into a flat plate shape having a predetermined size so as to be arranged between the columns of the upper building frame, and each of the second mounting brackets of the upper building frame. At least one second cover panel having a plurality of bolt through holes corresponding to each bolt insertion hole, and fixed to each of the first cover panels by a sheet fixing member, and below each first cover panel A first cover sheet that hangs down, a second cover sheet that is fixed to the second cover panel by a sheet stopper member and hangs down below the second cover panel, and a tray having a predetermined plane area And mounting the plurality of mounting bases in a vertical row on both the left and right sides of the construction site by the magnets of the fixed portion, respectively. Projecting toward the front, the building frame of the upper and lower two-stage configuration parallel to the construction site on the front side of the construction site, and the first mounting bracket of each column of the upper building frame The second bracket protrudes between the support columns toward the construction site side, and the height of the building frame is adjusted by the jack and installed. The mounting base and the upper building frame The first cover panels are arranged between the columns, and the bolt through holes of the first cover panels are inserted into the mounting brackets of the mounting bases and the bolts of the first mounting brackets. According to the insertion hole, it is attached by tightening a bolt through a nut, and the second cover panel is disposed between the columns of the upper building frame, and the bolt through holes of the second cover panel are arranged. Said each second In accordance with each bolt insertion hole of the attached bracket, it is attached by tightening the bolt through the nut, and at the same time, the first cover sheet is fixed to each first cover panel by the sheet stopper member, Each of the first cover panels is suspended below the first cover panel, and the second cover sheet is fixed to the second cover panel with the sheet stopper member, and is suspended below the second cover panel. Place the tray on the entire lower plane of the space surrounded by the frame, the first cover panel, the second cover panel, and the first and second cover sheets. Blasting material / removed coating film powder during blasting work by surrounding and shielding in a substantially U-shaped horizontal section by the mounting base, the building frame, the cover panels, and the cover sheets. Preventing scattering cover immediately under the construction site in the pan to collect the blast material and removing the coating film dust during blasting work in the pan, it is summarized in that.
This system preferably further comprises the following configuration.
(1) A flat bar is adopted for each sheet fixing member, the flat bar is attached to the first and second cover panels with bolts and nuts, respectively, and the first and second cover sheets are attached to the cover panels. It is sandwiched and fixed between the flat bars.
(2) Impact resistance attached to the lower part of each first cover panel directly to each first cover panel or to the steel material of the construction site, and attached with bolts and nuts through the attachment base, An auxiliary cover panel made of an engineering plastic excellent in workability is also provided, and the lower part of each first cover panel is partially shielded by this auxiliary cover panel.
(3) A packing for closing a gap generated at the top of the first and second cover panels is also provided, and the gap is sealed with the packing.
(4) Two sets of each of the above members are provided, and each of the above members is assembled and installed symmetrically on both front and back surfaces of the construction site so as to surround and cover both front and back surfaces of the construction site.

本考案のブラスト材・除去塗膜粉塵飛散防止システムによれば、上記の構成により、橋梁におけるオープンブラスト工法において、鋼製部の添接板や対傾構などボルト、狭隘部、凹部、凸部を含む施工部位毎に当該施工部位を部分的に簡易に取り囲み、スチールグリットを含むブラスト材及び塗膜除去粉塵の飛散を確実に防止するとともに、その完全な回収を実現し、ブラスト材にスチールグリットを使用できるようにして当該施工部位の施工の能率及び品質の向上を図ることができる、という格別な効果を奏する。 According to the blasting material / removed paint film dust scattering prevention system of the present invention, with the above-described configuration, in the open blasting method for bridges, bolts, narrow parts, concave parts, convex parts such as steel plate attachment plates and anti-tilt structures are provided. For each construction site to be included, the construction site is partially surrounded easily to prevent the blasting material containing steel grit and coating film removal dust from scattering, and to achieve complete recovery of the blasting material. There is an extraordinary effect that it is possible to improve the efficiency and quality of the construction of the construction site.

本考案の一実施の形態による橋梁におけるオープンブラスト工法に用いるブラスト材・除去塗膜粉塵飛散防止システムのイメージを示す図The figure which shows the image of the blasting material and removal coating film dust scattering prevention system used for the open blasting method in the bridge by one embodiment of this invention 同システムに用いる取付ベースを示す図（（ａ）は平面図（ｂ）は側面図）The figure which shows the mounting base used for the system ((a) is a plan view (b) is a side view) 同システムに用いる建枠を分解して示す図Exploded view of building frame used in the system 同システムに用いる建枠に取り付けられる第１、第２の取付ブラケットを示す図（（ａ）は第１の取付ブラケットを示す図（ｂ）は第２の取付ブラケットを示す図（ｃ）は建枠の支柱に取り付けられた状態の第１、第２の取付ブラケットの平面図）The figure which shows the 1st, 2nd mounting bracket attached to the building frame used for the system ((a) shows the 1st mounting bracket, (b) shows the 2nd mounting bracket, (c) shows the building) A plan view of the first and second mounting brackets attached to the column support) 同システムに用いるカバーパネルを示す図（（ａ）は第１のカバーパネルを示す図（ｂ）は第２のカバーパネルを示す図（ｃ）は第１の補助カバーパネルを示す図（ｄ）は第２の補助カバーパネルを示す図）The figure which shows the cover panel used for the system ((a) is the figure which shows the 1st cover panel, (b) is the figure which shows the 2nd cover panel, (c) is the figure which shows the 1st auxiliary cover panel (d)) Is a diagram showing a second auxiliary cover panel) 同システムに用いる受皿を示す図The figure which shows the saucer used for the system 同システムを橋梁の鋼製部のボルト、狭隘部、凹部、凸部を含む施工部位毎に組み立て設置した状態を示す図（側面図）Figure showing the system assembled and installed for each construction site including bolts, narrow parts, concave parts, and convex parts of the steel part of the bridge (side view) 同システムを橋梁の鋼製部のボルト、狭隘部、凹部、凸部を含む施工部位毎に組み立て設置した状態を示す図（正面図）The figure which shows the state which assembled and installed this system for every construction part including the bolt of a steel part of a bridge, a narrow part, a crevice, and a convex part (front view)

次に、この考案の一実施の形態について図を用いて説明する。図１に橋梁におけるオープンブラスト工法に用いるブラスト材・除去塗膜粉塵飛散防止システムを示している。
図１に示すように、このブラスト材・除去塗膜粉塵飛散防止システムＳでは、橋梁の鋼製部の特に添接版、対傾構のボルト回りなど、ボルト、狭隘部、凹部、凸部を含む施工部位Ｐ（以下、当該施工部位Ｐという。）毎に、当該施工部位Ｐの周囲を取り囲むための各種の部材を使用し、これらの部材を、当該施工部位Ｐを取り囲み覆うように組み立て設置して、ブラスト材・除去塗膜粉塵の飛散を防止する。 Next, an embodiment of the invention will be described with reference to the drawings. FIG. 1 shows a blasting material / removed coating film dust scattering prevention system used for an open blasting method in a bridge.
As shown in FIG. 1, this blast material / removed coating film dust scattering prevention system S includes bolts, narrow portions, concave portions, and convex portions such as a jointed plate of a steel portion of a bridge, around a bolt of an inclined structure, and the like. For each construction site P (hereinafter referred to as the construction site P), various members are used to surround the construction site P, and these members are assembled and installed so as to surround and cover the construction site P. To prevent dust from being removed from the blasting material and removed coating film.

このブラスト材・除去塗膜粉塵飛散防止システムＳで使用する各種の部材は、図２に示す複数個（この場合、１組１０個を２組）の取付ベース１、図３に示す複数組（この場合、２組）の上下の建枠２１、２２、複数個（この場合、１組４個を２組）の第１の取付ブラケット２３（図４参照）、複数個（この場合、１組４個を２組）の第２の取付ブラケット２４、複数本（この場合、１組２本を２組）のジャッキ２５、複数組（この場合、２組）の筋交２６からなる複数組（この場合、２組）の建枠２、図５（ａ）に示す複数枚（この場合、１組２枚を２組）の第１のカバーパネル３、図５（ｂ）に示す複数枚（この場合、１組１枚を２組）の第２のカバーパネル４、及び図５（ｃ）、（ｄ）に示す複数枚（この場合、１組２枚乃至３枚を２組）の補助カバーパネル５、複数枚（この場合、１組２枚を２組）の第１のカバーシート６１（図７参照）、及び複数枚（この場合、１組１枚を２組）の第２のカバーシート６２（図８参照）、複数個所分（この場合、この場合、１組３箇所分を２組）のパッキン７（図７、図８参照）、図６に示す複数組（この場合、２組）の受皿８などである。これらの部材はそれぞれ、次のような構成を備える。 The various members used in the blast material / removed coating film dust scattering prevention system S include a plurality of mounting bases 1 shown in FIG. 2 (in this case, two sets of 10), a plurality of sets shown in FIG. In this case, two sets of upper and lower building frames 21 and 22, a plurality (in this case, one set of four, two sets) of first mounting brackets 23 (see FIG. 4), a plurality of (in this case, one set) 2 sets of 2 mounting brackets 24, 4 sets of jacks 25 (in this case, 2 sets of 2 sets in this case), and multiple sets (in this case, 2 sets) of multiple sets (2 sets) of bracing 26 ( In this case, two sets of building frames 2, a plurality of sheets shown in FIG. 5A (in this case, two sets of one set, two) first cover panels 3, a plurality of sheets shown in FIG. 5B ( In this case, the second cover panel 4 of one set and two sets and a plurality of sheets shown in FIGS. 5C and 5D (in this case, two sets of 2 to 3 are set to 2 ) Auxiliary cover panel 5, a plurality of sheets (in this case, two pairs of one set) first cover sheet 61 (see FIG. 7), and a plurality of sheets (in this case, one set of two sheets) The second cover sheet 62 (see FIG. 8), a plurality of portions (in this case, one set of three portions for two sets) packing 7 (see FIGS. 7 and 8), a plurality of sets shown in FIG. In this case, there are two sets of trays 8 and the like. Each of these members has the following configuration.

取付ベース１は、図２に示すように、マグネットからなる固定部１１と、この固定部１１に一端が固定されて固定部１１から延び、ボルト挿通穴１２２を具備する取付ブラケット１２とからなる。この場合、固定部１１は略立方体形状のマグネットベースが採用される。このマグネットベースの一面にボルト１１１が突出される。取付ブラケット１２は一対のアルミ製の等辺山形鋼が採用される。これらの等辺山形鋼はそれぞれ、一方の面の中央に１つボルト挿通穴１２１が穿たれ、他方の面の上下に２つボルト挿通穴１２２が穿たれて、一方の面のボルト挿通穴１２１にマグネットベースのボルト１１１が通され、ボルト１１１にナット１１２が締められて、このボルト１１１上に装着される。このようにしてこれら複数の取付ベース１はそれぞれ、橋梁の鋼製部（例えばウェブやフランジ）に横方向に少なくとも２列にかつ当該各列縦方向の複数個所に固定部１１のマグネットの吸着により取り付けられ、取付ブラケット１２が鋼製部の板面に対して略直角に水平方向又は垂直方向に向けて突出される。 As shown in FIG. 2, the mounting base 1 includes a fixing portion 11 made of a magnet, and a mounting bracket 12 having one end fixed to the fixing portion 11 and extending from the fixing portion 11 and having a bolt insertion hole 122. In this case, the fixed part 11 employs a substantially cubic magnet base. Bolts 111 protrude from one surface of the magnet base. The mounting bracket 12 is made of a pair of aluminum equilateral angle steel. Each of these equilateral angle irons has one bolt insertion hole 121 formed in the center of one surface, and two bolt insertion holes 122 formed above and below the other surface. A magnet-based bolt 111 is passed, and a nut 112 is fastened to the bolt 111 and mounted on the bolt 111. In this way, each of the plurality of mounting bases 1 is attracted by the magnets of the fixing portions 11 to the steel portions (for example, webs and flanges) of the bridge in at least two rows in the horizontal direction and in a plurality of locations in the vertical direction of each row. The mounting bracket 12 is protruded in a horizontal direction or a vertical direction at a substantially right angle with respect to the plate surface of the steel portion.

建枠２は、図３に示すように、縦方向に延びる一対の支柱２１１及び２２１と、各支柱２１１及び２２１間に架け渡される複数の連結杆２１２及び２２２とからなり、橋梁の鋼製部（例えば、主桁ウェブの側面）に対して略平行に設置可能な上下２段構成の建枠になっている。この場合、上段の建枠２１は、アルミ製の角パイプにより形成され、一対の支柱２１１とこれらの支柱２１１の上部間及び下部間に連結される一対の連結杆２１２とにより全体が略矩形の枠状に組み立てられ、その一方の支柱２１１側が梯子状に形成される。なお、各支柱２１１の上端には支柱２１１の設置用にベース２１３が設けられる。また、下段の建枠２２は、アルミ製の角パイプにより形成され、一対の支柱２２１とこれらの支柱２２１の下部側間に連結される連結杆２２２とにより全体が略コ字形の枠状に組み立てられ、その一方の支柱２２１側が梯子状に形成される。なお、各支柱２２１の下端には支柱２２１の設置用にベース２２３が設けられる。
このようにして形成された上段の建枠２１の各支柱２１１の上下部間所定の位置に複数の第１の取付ブラケット２３（図４（ｃ）参照）が取り付けられ、この建枠２１の各支柱２１１の上下部間所定の位置に複数の第２の取付ブラケット２４が取り付けられる。第１の取付ブラケット２３はそれぞれ、一端に上下に長いボルト挿通穴（２３０）を一つ有し、この一端を連結杆２１２に対して水平方向の直角に突出するように取り付けられる。この場合、第１の取付ブラケット２３は、図４（ａ）に示すように、支柱２１１に固定される固定側の平板２３１と、この固定側の平板２３１の一側に蝶番を介して回動可能に取り付けられ、上下に長いボルト挿通穴２３０を１つ有する取付部をなす平板２３２とからなり、図４（ｃ）に示すように、固定側の平板２３１が支柱２１１の角パイプの一面の所定の位置に溶接により固着されて、取付部の平板２３２が支柱２１１の一面から当該面に対して直角方向に突出される。第２の取付ブラケット２４はそれぞれ、少なくとも一端に上下に長いボルト挿通穴２４０を一つ有し、この一端を連結杆２１２に対して平行に各支柱２１１間に突出するように取り付けられる。この場合、第２の取付ブラケット２４は一体の平板からなり、図４（ｂ）に示すように、中央が支柱２１１に固定される固定部２４１で、その両側にそれぞれ上下に長いボルト挿通穴２４０を１つずつ有する取付部２４２になっていて、図４（ｃ）に示すように、固定部２４１が支柱２１１の角パイプの第１の取付ブラケット２３の固定面とは反対側の面で第１の取付ブラケット２３の固定位置に対応する所定の位置に溶接により固着されて、各取付部２４２が第１の取付ブラケット２３の反対側で各支柱２１１の両側方に第１の取付ブラケット２３の突出方向に対して直角方向に突出される。
また、この建枠２には、建枠２の構造を補強するため、２組の筋交２６が用いられる。この場合、筋交２６は下段の建枠２２に入れるため、図３に示すように、筋交２６の両端部にボルト挿通穴２６０が設けられ、下段の建枠２２の各支柱２２１の上下部所定の位置にそれぞれボルト２６１が水平方向に突設されて、筋交２６が各支柱２２１にボルト、ナットで固定されるようになっている。
さらに、この建枠２には、建枠２全体の高さを調整するため、ジャッキ２５が各支柱２１１、２２１の一部に設けられる。図３に示すように、このジャッキ２５にはスクリューシャフト２５１及びリング状のナット２５０からなる複数のパイプジャッキ２５２が採用され、下段の建枠２２の各支柱２２１の上端部にパイプジャッキ２５２が挿着され、上段の建枠２１の各支柱２１１の下端部とナット２５０との間に調整パイプ２５３が介在されて、パイプジャッキ２５２が上下段の各建枠２１、２２の各支柱２１１、２２１間に介挿される。このようにしてパイプジャッキ２５２の操作、すなわち、ナット２５０の回転操作により、上段の建枠２１を下段の建枠２２に対して昇降して、建枠２全体の高さが調整される。
このようにして建枠２は鋼製部に対して所定の間隔をおいて正面に略平行に、各支柱２１１、２２１の上下方向の突っ張り支持により設置される。 As shown in FIG. 3, the building frame 2 includes a pair of columns 211 and 221 extending in the vertical direction, and a plurality of connecting rods 212 and 222 spanned between the columns 211 and 221. The building frame has a two-stage structure that can be installed substantially parallel to (for example, the side surface of the main girder web). In this case, the upper building frame 21 is formed of an aluminum square pipe, and is generally rectangular in shape by a pair of support columns 211 and a pair of connecting rods 212 connected between the upper and lower portions of these support columns 211. It is assembled in a frame shape, and one of the columns 211 is formed in a ladder shape. A base 213 is provided at the upper end of each column 211 for installing the column 211. The lower building frame 22 is formed of an aluminum square pipe, and is assembled into a substantially U-shaped frame shape by a pair of support columns 221 and a connecting rod 222 connected between the lower sides of these support columns 221. One pillar 221 side is formed in a ladder shape. A base 223 is provided at the lower end of each column 221 for installing the column 221.
A plurality of first mounting brackets 23 (see FIG. 4C) are attached at predetermined positions between the upper and lower portions of the columns 211 of the upper building frame 21 thus formed. A plurality of second mounting brackets 24 are mounted at predetermined positions between the upper and lower portions of the column 211. Each of the first mounting brackets 23 has one bolt insertion hole (230) that is long at the top and bottom at one end, and this one end is mounted so as to protrude at a right angle in the horizontal direction with respect to the connecting rod 212. In this case, as shown in FIG. 4A, the first mounting bracket 23 is rotated via a hinge on a fixed flat plate 231 fixed to the column 211 and on one side of the fixed flat plate 231. 4, and a flat plate 231 forming a mounting portion having one long bolt insertion hole 230 at the top and bottom. As shown in FIG. Affixed to a predetermined position by welding, the flat plate 232 of the mounting portion protrudes from one surface of the column 211 in a direction perpendicular to the surface. Each of the second mounting brackets 24 has at least one bolt insertion hole 240 that is vertically long at one end, and is attached so that one end protrudes between the columns 211 in parallel to the connecting rod 212. In this case, the second mounting bracket 24 is formed of an integral flat plate, and as shown in FIG. 4B, the center is a fixing portion 241 fixed to the support column 211, and the bolt insertion holes 240 that are vertically long on both sides thereof. As shown in FIG. 4C, the fixing portion 241 is a surface opposite to the fixing surface of the first mounting bracket 23 of the square pipe of the column 211, as shown in FIG. The first mounting bracket 23 is fixed to a predetermined position corresponding to the fixed position of the first mounting bracket 23 by welding, and each mounting portion 242 is opposite to the first mounting bracket 23 on both sides of each column 211. It protrudes in a direction perpendicular to the protruding direction.
Further, in order to reinforce the structure of the building frame 2, two sets of bracings 26 are used for the building frame 2. In this case, since the bracing 26 is put into the lower building frame 22, as shown in FIG. 3, bolt insertion holes 260 are provided at both ends of the bracing 26, and the upper and lower portions of each column 221 of the lower building frame 22. Bolts 261 are projected in a horizontal direction at predetermined positions, and the braces 26 are fixed to the respective columns 221 with bolts and nuts.
Further, the building frame 2 is provided with a jack 25 at a part of each of the columns 211 and 221 in order to adjust the height of the entire building frame 2. As shown in FIG. 3, a plurality of pipe jacks 252 including a screw shaft 251 and a ring-shaped nut 250 are adopted for the jack 25, and the pipe jacks 252 are inserted into the upper ends of the columns 221 of the lower building frame 22. The adjustment pipe 253 is interposed between the lower end of each support column 211 of the upper building frame 21 and the nut 250, and the pipe jack 252 is between the support columns 211 and 221 of the upper and lower building frames 21 and 22. Is inserted. In this way, by operating the pipe jack 252, that is, by rotating the nut 250, the upper building frame 21 is moved up and down relative to the lower building frame 22, and the overall height of the building frame 2 is adjusted.
In this way, the building frame 2 is installed by supporting the uprights 211 and 221 in the vertical direction substantially parallel to the front surface at a predetermined interval with respect to the steel part.

第１のカバーパネル３はそれぞれ、耐衝撃性、加工性に優れるエンジニアリングプラスチックにより、各取付ベース１と各上段の建枠２１の各支柱２１１との間に配置可能に平板状に形成される。この場合、第１のカバーパネル３は、図５（ａ）に示すように、耐久性が高く加工しやすいポリカーボネイトにより形成され、施工現場における取付ベース１と上段の建枠２１の各支柱２１１との間に配置可能な所定の大きさを有する略矩形状の平板で、各取付ベース１の取付ブラケット１２及び上段の建枠２１の各第１の取付ブラケット２３の各ボルト挿通穴１２２、２３０に対応する位置、このカバーパネル３の場合、一方の側部の上下各部にボルト通し穴３０が形成され、他方の側部の上、中、下各部にボルト通し穴３０ａ、３０ｂが対にして形成される。このようにしてこれら第１のカバーパネル３はそれぞれ、各取付ベース１と上段の建枠２１の各支柱２１１との間にボルト及びナットにより取り付けられる。
第２のカバーパネル４はそれぞれ、第１カバーパネル３と同様に、エンジニアリングプラスチック、すなわち、ポリカーボネイトにより、各上段の建枠２１の各支柱２１１間に配置可能に平板状に形成される。この場合、第２のカバーパネル４は、図５（ｂ）に示すように、上段の建枠２１の各支柱２１１間に配置可能な所定の大きさを有する略矩形状の平板で、上段の建枠２１の各第２の取付ブラケット２４の各ボルト挿通穴２４０に対応する位置、このカバーパネル４の場合、４つのコーナー部にボルト通し穴４０が形成される。このようにしてこの第２のカバーパネル４は、上段の建枠２１の各支柱２１１間にボルト及びナットにより取り付けられる。
複数の補助カバーパネル５はそれぞれ、耐衝撃性、加工性に優れるエンジニアリングプラスチックにより、第１のカバーパネル３の下部に配置可能に平板状に形成される。この場合、補助カバーパネル５は、第１、第２のカバーパネル３、４と同様に、ポリカーボネイトにより形成され、第１のカバーパネル３よりも小さい略矩形状の平板で、各第１のカバーパネル３の下部に、この第１のカバーパネル３に直接、又は当該施工部位Ｐ周辺の鋼材に取付ベース１を固定してこの取付ベース１を介して取り付けられる。この補助カバーパネル５は、このカバーパネル５を第１のカバーパネル３の下部に直接固定する場合、第１のカバーパネル３とともに相互に対応する適宜の位置にボルト通し穴（５１０）が形成され、また、当該施工部位Ｐの鋼材に取付ベース１を固定してこの取付ベース１に固定する場合、適宜の位置にボルト通し（５２０）が形成される。この場合、補助カバーパネル５として、第１、第２の補助カバーパネル５１、５２が用意される。第１の補助カバーパネル５１は第１のカバーパネル３の下部で主桁ウェブと主桁下フランジで囲まれたスペースに配置可能な所定の大きさを有する平板で、上部側の左右両側適宜の位置にそれぞれ第１のカバーパネル３の下部の一対のボルト通し穴３０ａ、３０ｂに対応する間隔で上下に長いボルト通し穴５１０が形成され、さらに、下部側の中央適宜の位置にボルト通し穴（５１１）が形成される。第２の補助カバーパネル５２は主桁下フランジの下方で主桁ウェブの左右両側に跨る所定の範囲に配置可能な所定の大きさを有する平板で、上部側の左右両側適宜の位置にそれぞれボルト通し穴（５２０）が形成される。このようにしてこれら補助カバーパネル５はそれぞれ、第１のカバーパネル３の下部に当該カバーパネル３に直接又は当該施工部位Ｐ近傍に取付ベース１を介してボルト及びナットで取り付けられる。 Each of the first cover panels 3 is formed in a flat plate shape so as to be disposed between each mounting base 1 and each column 211 of each upper building frame 21 by an engineering plastic excellent in impact resistance and workability. In this case, as shown in FIG. 5 (a), the first cover panel 3 is formed of polycarbonate that is highly durable and easy to process. The first cover panel 3 includes the mounting base 1 at the construction site and the columns 211 of the upper building frame 21. It is a substantially rectangular flat plate having a predetermined size that can be disposed between the bolt insertion holes 122, 230 of the mounting bracket 12 of each mounting base 1 and each first mounting bracket 23 of the upper building frame 21. In the corresponding position, in the case of this cover panel 3, bolt through holes 30 are formed in the upper and lower parts of one side, and bolt through holes 30a and 30b are formed in pairs on the upper, middle and lower parts of the other side. Is done. In this way, each of these first cover panels 3 is attached by bolts and nuts between the respective mounting bases 1 and the respective columns 211 of the upper building frame 21.
Similarly to the first cover panel 3, each of the second cover panels 4 is formed in a flat plate shape by an engineering plastic, that is, polycarbonate, so that it can be arranged between the columns 211 of each upper building frame 21. In this case, as shown in FIG. 5 (b), the second cover panel 4 is a substantially rectangular flat plate having a predetermined size that can be disposed between the columns 211 of the upper building frame 21. In the case of the cover panel 4 at positions corresponding to the bolt insertion holes 240 of the second mounting brackets 24 of the building frame 21, bolt through holes 40 are formed at four corner portions. In this way, the second cover panel 4 is attached between the columns 211 of the upper building frame 21 with bolts and nuts.
Each of the plurality of auxiliary cover panels 5 is formed in a flat plate shape so as to be disposed under the first cover panel 3 by an engineering plastic excellent in impact resistance and workability. In this case, like the first and second cover panels 3 and 4, the auxiliary cover panel 5 is a substantially rectangular flat plate made of polycarbonate and smaller than the first cover panel 3. The attachment base 1 is fixed to the lower part of the panel 3 directly to the first cover panel 3 or to the steel material around the construction site P and attached via the attachment base 1. When the cover panel 5 is directly fixed to the lower portion of the first cover panel 3, the auxiliary cover panel 5 is formed with bolt through holes (510) at appropriate positions corresponding to the first cover panel 3. Moreover, when fixing the mounting base 1 to the steel material of the construction site P and fixing the mounting base 1 to the mounting base 1, a bolt thread (520) is formed at an appropriate position. In this case, first and second auxiliary cover panels 51 and 52 are prepared as the auxiliary cover panel 5. The first auxiliary cover panel 51 is a flat plate having a predetermined size that can be arranged in the space surrounded by the main girder web and the main girder lower flange at the lower part of the first cover panel 3, and the right and left sides on the upper side are appropriately arranged. Bolt through holes 510 that are long in the vertical direction are formed at intervals corresponding to the pair of bolt through holes 30a and 30b on the lower portion of the first cover panel 3, and bolt through holes ( 511) is formed. The second auxiliary cover panel 52 is a flat plate having a predetermined size that can be arranged in a predetermined range straddling the left and right sides of the main girder web below the main girder lower flange, and bolts at appropriate positions on both the left and right sides of the upper side. A through hole (520) is formed. In this way, each of these auxiliary cover panels 5 is attached to the lower part of the first cover panel 3 with the bolts and nuts directly on the cover panel 3 or in the vicinity of the construction site P via the attachment base 1.

第１のカバーシート６１はそれぞれ、図７に示すように、各第１のカバーパネル３から各第１のカバーパネル３の下方の開放面を覆い閉塞可能な大きさ及び形状を有し、各第１のカバーパネル３にシート止め部材６０１を介して固定され、各第１のカバーパネル３の下方に垂下される。
第２のカバーシート６２は、図８に示すように、第２のカバーパネル４から第２のカバーパネル４の下方の開放面を覆い閉塞可能な大きさ及び形状を有し、第２のカバーパネル４にシート止め部材６０２を介して固定され、第２のカバーパネル４の下方に垂下される。
この場合、シート止め部材６０２にフラットバーが採用され、フラットバー６０２が第１、第２のカバーパネル３、４にそれぞれボルト及びナットにより取り付けられて、第１、第２のカバーシート６１、６２を、各カバーパネル３、４とフラットバー６０２との間に挟んで固定する。
これらカバーシート６１、６２はそれぞれ、各カバーパネル３、４にフラットバー６０１、６０２を介して固定され、これらカバーシート６１、６２により各カバーパネル３、４の下方、吊り足場付近までが遮蔽される。 As shown in FIG. 7, each of the first cover sheets 61 has a size and a shape that can cover and close the lower open surface of each first cover panel 3 from each first cover panel 3. The first cover panel 3 is fixed to the first cover panel 3 via a sheet stopper member 601 and is suspended below each first cover panel 3.
As shown in FIG. 8, the second cover sheet 62 has a size and a shape that can cover and close the open surface below the second cover panel 4 from the second cover panel 4. The panel 4 is fixed to the panel 4 via a sheet stopper member 602 and is suspended below the second cover panel 4.
In this case, a flat bar is adopted as the sheet stopper member 602, and the flat bar 602 is attached to the first and second cover panels 3 and 4 with bolts and nuts, respectively, and the first and second cover sheets 61 and 62 are attached. Is sandwiched between the cover panels 3 and 4 and the flat bar 602 and fixed.
The cover sheets 61 and 62 are fixed to the cover panels 3 and 4 via flat bars 601 and 602, respectively, and the cover sheets 61 and 62 shield the lower side of the cover panels 3 and 4 and the vicinity of the suspension scaffold. The

複数のパッキン７は、図７、図８に示すように、特に第１、第２のカバーパネル３、４の上部に生じる隙間を塞ぎ密閉するための詰め物で、この場合、ウレタンフォームからなるウレタンパッキンが採用される。ウレタンパッキン７が第１、第２のカバーパネル３、４の上部に生じる隙間に詰められて、隙間が密閉される。 As shown in FIGS. 7 and 8, the plurality of packings 7 are paddings for closing and sealing gaps generated in the upper portions of the first and second cover panels 3 and 4, and in this case, urethane made of urethane foam. Packing is adopted. The urethane packing 7 is packed in a gap generated in the upper part of the first and second cover panels 3 and 4 to seal the gap.

受皿８は、図７、図８に示すように、所定の平面積を有し、各建枠２、各カバーパネル３、４及び各カバーシート６１、６２で包囲される空間の下部平面を覆い、ケレン作業に使用するスチールグリットを受けるためのものになっている、この場合、受皿８はポリ容器からなり、吊り足場内での取り回しを考慮して、複数の受皿、この場合、図６に示すように、３個の受皿８１、８２、８３に分割して構成され、これら受皿８１、８２、８３を組合わせた上部開口面全体が当該下部平面と略同じ平面積を有している。
この受皿８は３個の受皿８１、８２、８３が組み合わされて当該下部平面内に設置される。 As shown in FIGS. 7 and 8, the tray 8 has a predetermined plane area and covers the lower plane of the space surrounded by each building frame 2, each cover panel 3, 4 and each cover sheet 61, 62. In this case, the tray 8 is made of a plastic container, and in consideration of handling in the suspension scaffold, a plurality of trays, in this case, in FIG. As shown in the figure, the tray is divided into three trays 81, 82, 83, and the entire upper opening surface in which these trays 81, 82, 83 are combined has substantially the same plane area as the lower plane.
The tray 8 is installed in the lower plane by combining three trays 81, 82, 83.

このブラスト材・除去塗膜粉塵飛散防止システムＳでは、上記各種の部材を２組ずつ使い、図１に示すように、これらの部材を添接板、対傾構など主桁ウェブのボルト、狭隘部、凹部、凸部を含む施工部位Ｐの表裏両面を取り囲み覆うように当該施工部位Ｐの表裏両面側に、すなわち主桁ウェブの左右両側に対称的に組み立てて設置する。
図７及び図８にこのブラスト材・除去塗膜粉塵飛散防止システムＳの組み立て設置例を具体的に示している。図７及び図８に示すように、主桁ウェブの左右両側の各面の当該施工部位Ｐにおいて当該施工部位Ｐの左右両側にそれぞれ、取付ベース１を３個ずつ、固定部１１のマグネットにより、縦一列に取り付けて、取付ブラケット１２を正面に向けて突出させる。この場合、各第１のカバーパネル３の上部を主桁上フランジの直下に合せて左右各列の取付ベース１と各上段の建枠２１の各支柱２１１との間に取り付けるので、各取付ベース１を各第１のカバーパネル３の各一対のボルト通し穴３０ａ，３０ｂの位置に合せて適宜の位置に固定する。そしてさらに、これら取付ベース１の左右各列の下方で主桁下フランジの上面及び下面の適宜の位置にそれぞれ、取付ベース１を１つずつ固定部１１のマグネットにより取り付けて、主桁下フランジの上面で取付ブラケット１２を上方に向けて突出させ、主桁下フランジの下面で取付ブラケット１２を下方に向けて突出させる。
この状態から、上下２段構成の建枠２１、２２を主桁ウェブの左右各面の当該施工部位Ｐの正面側に当該施工部位Ｐに対して平行に、かつ上段の建枠２１の各支柱２１１の各第１の取付ブラケット２３を当該施工部位Ｐ側に向けて置き、この建枠２を建枠２の高さをジャッキ２５により調整して各支柱２１１、２２１をコンクリート床版と吊り足場との間に突っ張り支持して設置する。そして、主桁ウェブの左右両側の各建枠２間に筋交２６を１組ずつ入れて各建枠２の構造を補強する。この場合、各下段の建枠２２間に筋交２６を１組ずつ渡し、各下段の建枠２２の各支柱２２１の上下部の各ボルト２６１を各筋交２６の端部のボルト挿通穴２６０に通し、ナットで締めて固定する。
このように主桁ウェブの左右両側に複数の取付ベース１と各建枠２を設置した状態で、図７に示すように、これら取付ベース１と各上段の建枠２１の各支柱２１１との間に各第１のカバーパネル３を配置し、各第１のカバーパネル３の各ボルト通し穴３０、３０ａ，３０ｂを各取付ベース１の取付ブラケット１２及び第１の各取付ブラケット２３の各ボルト挿通穴１２０、２３０に合わせて、ボルトを通しナットに締め込むことにより取り付けるとともに、図８に示すように、各上段の建枠２１の各支柱２１１間に第２のカバーパネル４を配置し、第２のカバーパネル４の各ボルト通し穴４０を各第２の各取付ブラケット２４の各ボルト挿通穴２４０に合わせて、ボルトを通しナットに締め込むことにより取り付ける。そして、図７に示すように、第１のカバーパネル３の下部で主桁ウェブと主桁下フランジで囲まれたスペースに各第１の補助カバーパネル５１を配置し、各第１の補助カバーパネル５１の上部側の各ボルト通し穴５１０と各第１のカバーパネル３下部の一対のボルト通し穴３０ａ、３０ｂとを合わせて、ボルトを通しナットに締め込み、各第１のカバーパネル３の下部側のボルト通し穴５１１と主桁下部フランジ上の取付ベース１の取付ブラケット１２のボルト挿通穴１２０とを合わせて、ボルトを通しナットに締め込むことにより取り付ける。そしてさらに、各第１のカバーパネル３の下方で主桁下フランジの下方の主桁ウェブの左右両側に跨る所定の範囲に、第２の補助カバーパネル５２を配置し、第２の補助カバーパネル５２の上部側の各ボルト通し穴５２０と主桁下部フランジ下の各取付ベース１の取付ブラケット１２のボルト挿通穴１２０とを合わせて、ボルトを通しナットに締め込むことにより取り付ける。
このようにして取り付けられた第１、第２のカバーパネル３、４にそれぞれ、さらにフラットバー６０１、６０２をボルト及びナットにより取り付け、第１、第２のカバーシート６１、６２をそれぞれ、各カバーパネル３、４とフラットバー６０１、６０２との間に挟み固して、各カバーシート６１、６２を第１、第２のカバーパネル３、４の下方、吊り足場付近まで垂下させる。
また、この場合、第１、第２のカバーパネル３、４の上部に生じる隙間にウレタンパッキン７を詰めて隙間を塞ぐ。
そして、これら建枠２、カバーパネル３、４及びカバーシート６１、６２で包囲される空間の下部平面全面に複数に分割された受皿８を置く。 In this blasting material / removed coating film dust scattering prevention system S, the above-mentioned various members are used in pairs, and as shown in FIG. Assemble and install symmetrically on both the front and back sides of the construction site P, that is, on both the left and right sides of the main girder web, so as to surround and cover both the front and back surfaces of the construction site P including the concave and convex portions.
FIG. 7 and FIG. 8 specifically show an assembly installation example of the blast material / removed coating film dust scattering prevention system S. As shown in FIG. 7 and FIG. 8, three attachment bases 1 on the left and right sides of the construction site P on the left and right sides of the construction site P on the left and right sides of the main girder web, It is attached in a vertical row, and the mounting bracket 12 protrudes toward the front. In this case, since the upper part of each first cover panel 3 is mounted directly below the main girder upper flange and mounted between the mounting bases 1 in the left and right rows and the respective columns 211 of the upper building frames 21, each mounting base 1 is fixed at an appropriate position according to the position of each pair of bolt through holes 30a, 30b of each first cover panel 3. Further, the mounting base 1 is attached to each of the appropriate positions on the upper and lower surfaces of the main girder lower flange below the left and right rows of the mounting base 1 one by one with the magnet of the fixing portion 11, and The mounting bracket 12 protrudes upward on the upper surface, and the mounting bracket 12 protrudes downward on the lower surface of the main girder lower flange.
From this state, the upper and lower building frames 21 and 22 are arranged in parallel to the construction site P on the front side of the construction site P on the left and right surfaces of the main girder web, and in each column of the upper construction frame 21. Each first mounting bracket 23 of 211 is placed facing the construction site P side, the height of the building frame 2 is adjusted by the jack 25, and each column 211, 221 is attached to the concrete floor slab and the suspended scaffolding. Install with support. Then, one set of bracings 26 is inserted between the building frames 2 on the left and right sides of the main girder web to reinforce the structure of each building frame 2. In this case, one set of bracings 26 is passed between the lower building frames 22, and the bolts 261 at the upper and lower portions of the columns 221 of the lower building frames 22 are bolt insertion holes 260 at the ends of the bracings 26. Pass through and tighten with nuts.
In the state where the plurality of mounting bases 1 and the respective building frames 2 are installed on the left and right sides of the main girder web in this way, as shown in FIG. 7, the mounting base 1 and each column 211 of each upper building frame 21 are connected. The first cover panels 3 are arranged between the bolt through holes 30, 30 a, 30 b of the first cover panels 3, and the bolts of the mounting bracket 12 of the mounting base 1 and the bolts of the first mounting bracket 23. Along with the insertion holes 120 and 230, the bolts are passed through and tightened to the nuts, and as shown in FIG. 8, the second cover panel 4 is disposed between the columns 211 of each upper building frame 21, Each bolt through hole 40 of the second cover panel 4 is aligned with each bolt insertion hole 240 of each second mounting bracket 24, and the bolt is passed through and tightened to the nut. Then, as shown in FIG. 7, each first auxiliary cover panel 51 is arranged in a space surrounded by the main girder web and the main girder lower flange below the first cover panel 3, and each first auxiliary cover is arranged. The bolt through holes 510 on the upper side of the panel 51 and the pair of bolt through holes 30a and 30b on the lower side of the first cover panel 3 are aligned, and the bolts are passed through and tightened into the nuts. The lower bolt through hole 511 and the bolt insertion hole 120 of the mounting bracket 12 of the mounting base 1 on the lower flange of the main girder are aligned, and the bolt is passed through and tightened into the nut. Further, a second auxiliary cover panel 52 is disposed below the first cover panels 3 in a predetermined range straddling the left and right sides of the main girder web below the main girder lower flange. Each bolt through hole 520 on the upper side of 52 and the bolt insertion hole 120 of the mounting bracket 12 of each mounting base 1 below the lower flange of the main girder are aligned, and the bolt is passed through and tightened into the nut.
The flat bars 601 and 602 are further attached to the first and second cover panels 3 and 4 attached in this way with bolts and nuts, and the first and second cover sheets 61 and 62 are attached to the respective covers. The cover sheets 61 and 62 are suspended between the panels 3 and 4 and the flat bars 601 and 602 and are suspended below the first and second cover panels 3 and 4 and near the suspension scaffold.
In this case, the urethane packing 7 is filled in the gap generated at the top of the first and second cover panels 3 and 4 to close the gap.
Then, the tray 8 divided into a plurality of parts is placed on the entire lower plane of the space surrounded by the building frame 2, the cover panels 3 and 4, and the cover sheets 61 and 62.

このようにこのシステムＳでは、主桁ウェブの左右両側の当該施工部位Ｐを、第１、第２のカバーパネル３、４、及び第１、第２の各カバーシート６１、６２により形成される囲いＳ１により、水平断面略コ字形に取り囲み遮蔽し、この囲いＳ１の上部に生じる隙間をウレタンパッキン７で密閉して、ブラスト作業時のブラスト材・除去塗膜粉塵の飛散を防止し、当該施工部位Ｐ直下を受皿８で覆い、この受皿８でブラスト作業時のブラスト材・除去塗膜粉塵を回収するようになっている。
このような囲いＳ１により包囲密閉された当該施工部位Ｐの正面空間内では、当該施工部位Ｐにブラスト材にスチールグリットを使用したケレン作業が行われても、この作業に伴うスチールグリットや除去塗膜粉塵の飛散は、各カバーパネル３、４、各カバーシート６１、６２により確実に遮断され、当該施工部位Ｐの正面空間外に飛散することがなく、また、各カバーパネル３、４、各カバーシート６１、６２により遮断されるスチールグリット、除去塗膜粉塵は当該施工部位Ｐの正面空間内で落下して下部の受皿８で受け、効率よく完全に回収される。したがって、当該施工部位Ｐ周辺に粉塵、スチールグリットの飛散がなく、スチールグリットの使用でありながら錆による汚染がない。
このようなシステムＳの採用により、橋梁におけるオープンブラスト工法でブラスト材にスチールグリットを使用してケレン作業を行うことができ、添接板や対傾構のボルト回りなど施工が容易でない部位でも、ケレン能力、作業効率を共に向上させることができる。
このシステムＳを採用し、スチールグリットを使用してボルト回りの試験施工を行った結果、従来の電動工具を使用する施工に比べて、およそ２０倍以上の作業効率が得られ、２種ケレンより施工品質の高い１種ケレンの品質が得られている。
なお、この囲いＳ１により密閉された空間内は高圧のエアーにより負荷が掛かることがあるので、囲いＳ１の一部に排気口を設け、フィルターを付けた電動ファンなどによりダクト排気することが好ましい。 Thus, in this system S, the construction site P on the left and right sides of the main girder web is formed by the first and second cover panels 3 and 4 and the first and second cover sheets 61 and 62. The enclosure S1 is surrounded and shielded in a substantially U-shaped horizontal cross section, and the gap generated at the top of the enclosure S1 is sealed with the urethane packing 7 to prevent the blasting material and removed coating dust from being scattered during the blasting operation. A portion 8 directly below the portion P is covered with a tray 8, and the tray 8 collects blasting material and removed coating film dust during blasting.
In the front space of the construction site P that is enclosed and sealed by such an enclosure S1, even if a keren operation using steel grit as a blast material is performed on the construction site P, the steel grit and removal coating accompanying this operation are performed. The scattering of the film dust is surely blocked by the cover panels 3 and 4 and the cover sheets 61 and 62, and is not scattered outside the front space of the construction site P. Steel grit and removed coating film dust blocked by the cover sheets 61 and 62 fall within the front space of the construction site P, and are received by the lower tray 8 and efficiently and completely recovered. Therefore, there is no scattering of dust and steel grit around the construction site P, and there is no contamination by rust while using the steel grit.
By adopting such a system S, it is possible to perform keren work using steel grit as the blasting material in the open blasting method for bridges, and even in parts where construction is not easy, such as attachment plates and anti-tilt bolts Both ability and work efficiency can be improved.
As a result of adopting this system S and performing the test construction around the bolt using steel grit, the work efficiency is about 20 times higher than the construction using the conventional electric tool. The quality of one kind of keren with high construction quality is obtained.
Since the space sealed by the enclosure S1 may be loaded with high-pressure air, it is preferable to exhaust the duct with an electric fan or the like provided with an exhaust port in a part of the enclosure S1 and attached with a filter.

以上説明したように、このシステムＳによれば、橋梁におけるオープンブラスト工法において主桁ウェブの左右両側の施工部位Ｐ毎に、その周囲に、複数のマグネット式の取付ベース１、複数の取付ブラケット２３、２４を有するジャッキ２５付きの２組の建枠２などにより、ボルト止めで、複数のカーボネイト板からなるカバーパネル３、４、さらにカバーシート６１、６２を張って、囲いＳ１を作り、囲いＳ１の上部に生じる隙間はウレタンパッキン７で密閉し、この囲いＳ１内の足場上にポリ容器からなる受皿８を置いてこの足場上を覆うので、主桁ウェブの添接板や対傾構のボルト回りなどボルト、狭隘部、凹部、凸部を含む施工部位を部分的に簡易に取り囲み、スチールグリットを含むブラスト材及び塗膜除去粉塵の飛散を確実に防止し、これらブラスト材及び塗膜除去粉塵を効率的に完全回収することができる。
そして、このブラスト作業時のブラスト材・除去塗膜粉塵の飛散の確実な防止と、このブラスト作業時のブラスト材・除去塗膜粉塵の効率のよい回収により、ブラスト材にスチールグリットを使用した施工を行え、当該施工部位Ｐにおける施工の能率及び品質の向上を図ることができる。 As described above, according to this system S, in the open blasting method for the bridge, for each construction site P on the left and right sides of the main girder web, there are a plurality of magnet-type mounting bases 1 and a plurality of mounting brackets 23 around it. , 24 with two sets of building frames 2 with jacks 25 and the like, bolted, cover panels 3 and 4 made of a plurality of carbonate plates, and cover sheets 61 and 62 are stretched to create an enclosure S1 and an enclosure S1 The gap generated in the upper part of the seal is sealed with urethane packing 7, and a receiving tray 8 made of a plastic container is placed on the scaffolding in this enclosure S1 to cover the scaffolding. The construction site including bolts, narrow parts, concave parts, convex parts, etc. is partly surrounded easily, and the blasting material including steel grit and coating film removal dust are surely scattered. Sealed, it is possible to these blast material and film removal dust efficiently complete recovery.
And construction that uses steel grit for the blasting material by reliably preventing the blasting material / removed coating film dust from scattering during the blasting operation and efficient recovery of the blasting material / removing coating film dust during the blasting operation The efficiency and quality of construction at the construction site P can be improved.

また、このシステムＳに用いる各種の部材は、次のような利点がある。
（１）取付ベース１をマグネットベースにより既存の鋼製部に固定するようにしたので、その取り付けが容易でしかも堅固に取り付けることができ、囲いＳ１の密閉性を十分に確保することができる。
（２）建枠２をアルミパイプで形成したので、軽量で、搬送、組み立てなどの取り扱いが容易である。
（３）各カバーパネル３、４にポリカーボネイト板を用いたので、低コストで、現場に合った寸法、形状に加工しやすく、また、耐久性が高いので、同一現場での転用使用が可能である。
（４）各取付ブラケット２３、２４や補助カバーパネル５などにボルト挿通穴２３０、２４０、ボルト通し穴５１０を長穴状に形成し、また、建枠２に高さを調整するためのジャッキ２５を設けたので、各種の部材全体を現場寸法に柔軟に合わせて組み立てることができる。 Various members used in the system S have the following advantages.
(1) Since the attachment base 1 is fixed to the existing steel part by the magnet base, the attachment can be easily and firmly attached, and the sealing property of the enclosure S1 can be sufficiently secured.
(2) Since the building frame 2 is formed of an aluminum pipe, it is lightweight and easy to handle such as transportation and assembly.
(3) Polycarbonate plates are used for each of the cover panels 3 and 4, so it is easy to process into a size and shape that suits the site at low cost, and because it is highly durable, it can be used on the same site. is there.
(4) Bolt insertion holes 230 and 240 and bolt through holes 510 are formed in the mounting brackets 23 and 24 and the auxiliary cover panel 5 in a long hole shape, and the jack 25 for adjusting the height of the building frame 2 is provided. Therefore, it is possible to assemble various members flexibly according to site dimensions.

なお、この実施の形態では、囲いＳ１を、上記各種の部材により、主桁ウェブのボルト、狭隘部、凹部、凸部を含む施工部位を覆うように、主桁ウェブの左右両側に対称的に組立てる施工例を示したが、この囲いＳ１をさらに、主桁ウェブの長さ方向に沿って連続的又は断続的に組み立ててもよく、また、主桁ウェブの左右いずれか一方の側にのみ１箇所又は複数個所に連続的若しくは断続的に組み立ててもよい。 In this embodiment, the enclosure S1 is symmetrically formed on the left and right sides of the main girder web so as to cover the construction site including the bolts, narrow portions, concave portions, and convex portions of the main girder web by the various members. Although the construction example to assemble was shown, this enclosure S1 may be further assembled continuously or intermittently along the length direction of the main girder web, and only 1 on either the left or right side of the main girder web. You may assemble continuously or intermittently in the place or several places.

Ｓブラスト材・除去塗膜粉塵飛散防止システム
Ｓ１囲い
Ｐ施工部位
１取付ベース
１１固定部
１１１ボルト
１１２ナット
１２取付ブラケット
１２１ボルト挿通穴
１２２ボルト挿通穴
２建枠
２１上段の建枠
２１１支柱
２１２連結杆
２１３ベース
２２下段の建枠
２２１支柱
２２２連結杆
２２３ベース
２３第１の取付ブラケット
２３０ボルト挿通穴
２３１固定側の平板
２３２取付部をなす平板
２４第２の取付ブラケット
２４０ボルト挿通穴
２４１固定部
２４２取付部
２５ジャッキ
２５０リング状のナット
２５１スクリューシャフト
２５２パイプジャッキ
２５３調整パイプ
２６筋交
２６０ボルト挿通穴
２６１ボルト
３第１のカバーパネル
３０ボルト通し穴
３０ａ，３０ｂ一対のボルト通し穴
４第２のカバーパネル
４０ボルト通し穴
５補助カバーパネル
５１第１の補助カバーパネル
５１０ボルト通し穴
５１１ボルト通し穴
５２第２の補助カバーパネル
５２０ボルト通し穴
６１第１のカバーシート
６２第２のカバーシート
６０１シート止め部材（フラットバー）
６０２シート止め部材（フラットバー）
７パッキン（ウレタンパッキン）
８受皿 S Blasting material / removed paint film dust scattering prevention system S1 Enclosure P Construction site 1 Mounting base 11 Fixing part 111 Bolt 112 Nut 12 Mounting bracket 121 Bolt insertion hole 122 Bolt insertion hole 2 Building frame 21 Upper building frame 211 Post 212 Connecting rod 213 Base 22 Lower building frame 221 Post 222 Connection rod 223 Base 23 First mounting bracket 230 Bolt insertion hole 231 Flat plate on fixed side 232 Flat plate forming mounting portion 24 Second mounting bracket 240 Bolt insertion hole 241 Fixing portion 242 Mounting Part 25 Jack 250 Ring-shaped nut 251 Screw shaft 252 Pipe jack 253 Adjustment pipe 26 Bracing 260 Bolt insertion hole 261 Bolt 3 First cover panel 30 Bolt through hole 30a, 30b A pair of bolt through holes 4 First Cover panel 40 bolt through hole 5 auxiliary cover panel 51 first auxiliary cover panel 510 bolt through hole 511 bolt through hole 52 second auxiliary cover panel 520 bolt through hole 61 first cover sheet 62 second cover sheet 601 Sheet stopper (flat bar)
602 Sheet stopper (flat bar)
7 Packing (urethane packing)
8 saucer

Claims

The open blasting method for bridges is an open blasting method for bridges that prevents the blasting material and removed coating dust from being scattered by assembling and installing each construction site including bolts, narrow parts, concave parts, and convex parts of the steel part of the bridge. A blasting material / removed coating film dust prevention system to be used,
A plurality of mounting bases each having a fixing bracket made of a magnet, and a mounting bracket having one end fixed to the fixing portion and extending from the fixing portion, and having a bolt insertion hole;
A pair of upper and lower building frames comprising a pair of columns extending in the vertical direction and connecting rods spanning between the columns, and having two upper and lower stages that can be installed substantially parallel to the steel part. A plurality of first mounting brackets which are attached at predetermined positions between the upper and lower parts of each support of the frame so that one end protrudes at right angles to the connecting rod in the horizontal direction and have long bolt insertion holes at the upper and lower ends. , And at a predetermined position between the upper and lower portions of each column of the upper building frame so that at least one end protrudes between the columns in parallel to the connecting rod, and a bolt insertion hole that is vertically long at the one end A plurality of second mounting brackets having:
A plurality of jacks provided in a part of each of the columns, and for adjusting the height of the entire building frame,
By engineering plastics excellent in impact resistance and workability, it is formed in a flat plate shape having a predetermined size so that it can be arranged between each mounting base and each column of the upper building frame, and each of the mounting bases At least two first cover panels having a plurality of bolt through holes corresponding to the respective bolt insertion holes of the respective first mounting brackets of the mounting bracket and the upper building frame, and the engineering plastic, It is formed in a flat plate shape having a predetermined size so that it can be arranged between the columns of the building frame, and has a plurality of bolt holes corresponding to the bolt insertion holes of the second mounting brackets of the upper building frame. At least one second cover panel;
The first cover sheet is fixed to each first cover panel by a sheet stopper member, the first cover sheet is hung down below each first cover panel, and the second cover panel is fixed to the first cover panel by a sheet stopper member, A second cover sheet suspended below the second cover panel;
A saucer having a predetermined plane area;
With
The plurality of mounting bases are respectively mounted in a vertical row on the left and right sides of the construction site by the magnets of the fixing portion, the mounting bracket projects toward the front, and the building frame having the upper and lower two-stage configuration is attached to the construction site. Parallel to the construction site on the front side, the first mounting brackets of the columns of the upper building frame facing the construction site side, and the second brackets between the columns. Protruding, adjusting the height of the building frame with the jack and installing it,
Each of the first cover panels is disposed between each of the mounting bases and each column of the upper building frame, and each of the bolt through holes of each of the first cover panels is inserted into each of the mounting brackets of each of the mounting bases. And by fitting each bolt insertion hole of each said first mounting bracket by tightening a bolt through a nut, the second cover panel is arranged between each column of the upper building frame, The bolt through holes of the second cover panel are aligned with the bolt insertion holes of the second mounting brackets, and are attached by tightening the bolts into the through nuts. The first cover sheet is fixed by the sheet stopper member and hangs below the first cover panels, and the second cover panel is attached to the second cover. The over preparative fixed by the sheet holding member, suspended below the second cover panel,
Place the tray on the entire lower plane of the space surrounded by the building frame, the first cover panels, the second cover panels, and the first and second cover sheets,
The construction site is surrounded and shielded by the mounting base, the building frame, the cover panels, and the cover sheets in a substantially U-shaped horizontal cross section, and the blasting material and removed coating film dust are scattered during the blasting operation. , Cover the construction site directly under the saucer, collect the blasting material and removed coating film dust during blasting work with the saucer,
A blasting material / removed paint film dust prevention system used for the open blasting method for bridges.

A flat bar is adopted for each sheet fixing member, the flat bar is attached to the first and second cover panels with bolts and nuts, respectively, and the first and second cover sheets are attached to the cover panel and the flat bar. A blasting material / removed coating film dust scattering prevention system for use in an open blasting method for a bridge according to claim 1, wherein the system is sandwiched between and fixed.

At the bottom of each first cover panel, the mounting base is fixed directly to each first cover panel or to the steel material of the construction site, and the bolts and nuts are used to attach the mounting base to the impact resistance and workability. A blasting material used for an open blasting method for a bridge according to claim 1 or 2, further comprising an auxiliary cover panel made of an excellent engineering plastic, wherein the auxiliary cover panel partially shields the lower part of each first cover panel. -Removal coating dust scattering prevention system.

The blasting used for the open blasting method in a bridge according to any one of claims 1 to 3, further comprising a packing for closing a gap generated at an upper part of the first and second cover panels, and sealing the gap with the packing. Material / removed coating dust scattering prevention system.

5. Each of the above members is provided in two sets, and each member is assembled and installed symmetrically on both the front and back surfaces of the construction site so as to surround and cover both front and back surfaces of the construction site. Blasting material and removal coating dust scattering prevention system used for the open blasting method in Japanese bridges.