JP6952572B2 - Overhang erection work vehicle and construction method - Google Patents

Overhang erection work vehicle and construction method Download PDF

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JP6952572B2
JP6952572B2 JP2017206421A JP2017206421A JP6952572B2 JP 6952572 B2 JP6952572 B2 JP 6952572B2 JP 2017206421 A JP2017206421 A JP 2017206421A JP 2017206421 A JP2017206421 A JP 2017206421A JP 6952572 B2 JP6952572 B2 JP 6952572B2
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bridge
work vehicle
girder
erection
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JP2019078090A (en
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正吾 塩塚
正吾 塩塚
高橋 淳
淳 高橋
惠治 大村
惠治 大村
力 稲船
力 稲船
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Kajima Corp
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Description

本発明は、張出架設作業車及び施工方法に関するものである。 The present invention relates to an overhanging erection work vehicle and a construction method.

従来、このような分野の技術として、特許文献1及び非特許文献1に記載の施工方法が知られている。特許文献1の施工方法はエレクションノーズ方式であり、使用される張出架設作業車は、橋桁から張出したエレクションノーズと、エレクションノーズによって吊支持された作業足場とを備えている。エレクションノーズによってPCブロックが吊上げられ既存の橋桁の先端に接合される。このとき、PCブロックと作業足場との干渉を避けるために、2つの作業足場(接着用吊足場、緊張用吊足場)が移動されてスペースが設けられ、吊上げられるPCブロックはこの2つの作業足場の間のスペースを通過する。また、非特許文献1の施工方法は、張出架設作業車でPCブロックを吊り上げるものである。下部作業床の先端部が下方に折曲げられるように回動することで、吊上げられるPCブロックと下部作業床との干渉が避けられている。 Conventionally, as a technique in such a field, the construction methods described in Patent Document 1 and Non-Patent Document 1 are known. The construction method of Patent Document 1 is an erection nose method, and the overhanging erection work platform used includes an erection nose overhanging from a bridge girder and a work scaffold suspended and supported by the erection nose. The PC block is lifted by the erection nose and joined to the tip of the existing bridge girder. At this time, in order to avoid interference between the PC block and the work scaffold, two work scaffolds (adhesive suspension scaffold, tension suspension scaffold) are moved to provide a space, and the PC block to be lifted is these two work scaffolds. Pass through the space between. Further, the construction method of Non-Patent Document 1 is to lift a PC block with an overhanging erection work vehicle. By rotating the tip of the lower work floor so that it can be bent downward, interference between the suspended PC block and the lower work floor is avoided.

特開平10−195827号公報Japanese Unexamined Patent Publication No. 10-195827

「牧港高架橋上部工(P4-P6)の架設現場を見学しました。」、[online]、琉球大学工学部環境建設工学科構造工学研究室、[平成29年9月19日検索]、インターネット、(URL:http://www.structur.tec.u-ryukyu.ac.jp/doc/0529makiminatokoukakyoukengaku.pdf)"I visited the construction site of the Makiminato High Bridge Superstructure (P4-P6).", [Online], Structural Engineering Laboratory, Department of Environmental Construction Engineering, Faculty of Engineering, Ryukyu University, [Search on September 19, 2017], Internet, (URL) : http://www.structur.tec.u-ryukyu.ac.jp/doc/0529makiminatokoukakyoukengaku.pdf)

しかしながら、架設作業車で対象物を吊上げ又は吊下げするために、橋桁の下方の作業足場等を駆動させるといった大掛りな作業が発生すると、作業効率が悪化する。また、この種の張出架設作業車による工事は高所で行われ、作業足場や下部作業床等の駆動も高所作業であることから、安全性の確保に対して大きな負担を強いられる。この課題に鑑み、本発明は、作業効率がよく安全性が高い張出架設作業車及び施工方法を提供することを目的とする。 However, when a large-scale work such as driving a work scaffolding or the like below the bridge girder occurs in order to lift or hang the object with the aerial work platform, the work efficiency deteriorates. In addition, construction work using this type of overhanging erection work platform is carried out at high places, and the driving of work scaffolding and lower work floors is also carried out at high places, which imposes a heavy burden on ensuring safety. In view of this problem, it is an object of the present invention to provide an overhanging erection work vehicle and a construction method having high work efficiency and high safety.

本発明の張出架設作業車は、橋梁の架設又は解体に使用される張出架設作業車であって、橋桁上に設置される移動作業車と、移動作業車によって橋桁の下方の位置に吊支持される下部作業床と、を備え、下部作業床には上下に貫通する開口が設けられている。 The overhanging erection work vehicle of the present invention is an overhanging erection work vehicle used for erection or demolition of a bridge, and is suspended by a moving work vehicle installed on the bridge girder and a position below the bridge girder by the moving work vehicle. It is provided with a supported lower work floor, and the lower work floor is provided with openings that penetrate vertically.

また、本発明の張出架設作業車では、橋梁の架設又は解体の施工現場に搬入される対象物、又は施工現場から搬出される対象物が、移動作業車に吊られ開口を上下方向に通過して吊上げ移動又は吊下げ移動されるようにしてもよい。また、対象物は、橋梁の部材、橋梁の仮設資材、又は機材であってもよい。また、対象物は、橋梁の部材であり橋桁の一部となるプレキャスト部材であってもよい。また、開口は開閉可能に設けられてもよい。 Further, in the overhanging erection work vehicle of the present invention, an object carried into the construction site of bridge erection or demolition, or an object carried out from the construction site is hung by the moving work vehicle and passes through the opening in the vertical direction. It may be lifted or suspended. Further, the object may be a member of the bridge, a temporary material of the bridge, or equipment. Further, the object may be a precast member that is a member of the bridge and is a part of the bridge girder. Further, the opening may be provided so as to be openable and closable.

本発明の施工方法は、橋桁上に設置される移動作業車と、移動作業車によって橋桁の下方の位置に吊支持された下部作業床と、を備える張出架設作業車を使用して橋梁の架設又は解体を行う施工方法であって、下部作業床には上下に貫通する開口が設けられている。 The construction method of the present invention uses an overhanging erection work vehicle including a mobile work vehicle installed on the bridge girder and a lower work floor suspended and supported by the mobile work vehicle at a position below the bridge girder. It is a construction method for erection or dismantling, and the lower work floor is provided with openings that penetrate vertically.

また、本発明の施工方法では、橋梁の架設又は解体の施工現場に搬入される対象物、又は施工現場から搬出される対象物が、移動作業車に吊られ開口を上下方向に通過して吊上げ移動又は吊下げ移動される工程を備えてもよい。また、対象物は、橋梁の部材、橋梁の仮設資材、又は機材であってもよい。また、対象物は、橋梁の部材であり橋桁の一部となるプレキャスト部材であってもよい。また、開口は開閉可能に設けられてもよい。 Further, in the construction method of the present invention, an object carried into the construction site for erection or demolition of a bridge, or an object carried out from the construction site is suspended by a moving work vehicle and passed through an opening in the vertical direction to be lifted. It may be provided with a step of being moved or suspended. Further, the object may be a member of the bridge, a temporary material of the bridge, or equipment. Further, the object may be a precast member that is a member of the bridge and is a part of the bridge girder. Further, the opening may be provided so as to be openable and closable.

本発明によれば、作業効率がよく安全性が高い張出架設作業車及び施工方法を提供することができる。 According to the present invention, it is possible to provide an overhanging erection work vehicle and a construction method having high work efficiency and high safety.

図1は、実施形態の張出架設作業車及び施工方法が適用される橋梁の側面図である。FIG. 1 is a side view of the overhanging erection work vehicle of the embodiment and the bridge to which the construction method is applied. 張出架設作業車の近傍を拡大して示す側面図である。It is a side view which shows the vicinity of the overhanging erection work vehicle in an enlarged manner. 張出架設作業車の近傍を拡大して示す平面図である。It is a top view which shows the vicinity of the overhanging erection work vehicle enlarged. (a),(b)は、実施形態の施工方法を順に示す側面図である。(A) and (b) are side views which show the construction method of an Embodiment in order. (a),(b)は、実施形態の施工方法を順に示す側面図である。(A) and (b) are side views which show the construction method of an Embodiment in order. 下部作業床の一例を示す平面図である。It is a top view which shows an example of the lower work floor. (a),(b)は、それぞれ下部作業床の他の例を示す側面図である。(A) and (b) are side views showing other examples of the lower work floor, respectively. (a),(b)は、下部作業床の更に他の例を示す側面図である。(A) and (b) are side views showing still another example of the lower work floor. (a),(b)は、それぞれ下部作業床の更に他の例を示す側面図である。(A) and (b) are side views showing still another example of the lower work floor, respectively. (a),(b)は、斜材ケーブルの吊上げ方法を示す側面図である。(A) and (b) are side views which show the method of hoisting a diagonal cable.

以下、本発明の施の形態について図面を参照しながら具体的に説明する。便宜上、実質的に同一の要素には同一の符号を付し、その説明を省略する場合がある。 Hereinafter, the embodiment of the present invention will be specifically described with reference to the drawings. For convenience, substantially the same elements may be designated by the same reference numerals and the description thereof may be omitted.

図1は、橋梁100及び張出架設作業車1を示す側面図である。図2は張出架設作業車1の近傍を拡大して示す側面図であり、図3はその平面図である。橋梁100の橋桁102は、張出架設作業車1を用いた張出架設工法によって施工される。橋桁102は、橋脚101の柱頭部103を始点として、計画された長さ分ずつ段階的に施工され、隣接する他の橋脚の柱頭部103に向けて段階的に橋軸方向に伸長していく。実際には1つの柱頭部103から二方向の張出架設が並行して実行されるが、本実施形態では、そのうちの一方向の張出架設の施工についてのみ説明する。以下では、張出架設工法によって橋桁102が伸長していく方向を前方として、「前方」、「後方」といったような文言を用いる場合がある。また、図に示されるように橋梁100の橋軸直角方向に沿う水平方向にX軸、橋軸方向に沿う水平方向にY軸、鉛直方向にZ軸を取って、各部の位置関係等の説明にX,Y,Zを用いる場合がある。 FIG. 1 is a side view showing the bridge 100 and the overhanging erection work vehicle 1. FIG. 2 is an enlarged side view showing the vicinity of the overhanging erection work vehicle 1, and FIG. 3 is a plan view thereof. The bridge girder 102 of the bridge 100 is constructed by the overhang erection method using the overhang erection work vehicle 1. The bridge girder 102 is constructed stepwise by the planned length starting from the capital 103 of the pier 101, and gradually extends in the direction of the bridge axis toward the capital 103 of other adjacent piers. .. Actually, the overhanging erections in two directions are executed in parallel from one stigma 103, but in the present embodiment, only the construction of the overhanging erections in one direction will be described. In the following, words such as "front" and "rear" may be used with the direction in which the bridge girder 102 extends by the overhanging erection method as the front. Further, as shown in the figure, the X-axis is taken in the horizontal direction along the bridge axis perpendicular direction of the bridge 100, the Y-axis is taken in the horizontal direction along the bridge axis direction, and the Z-axis is taken in the vertical direction, and the positional relationship of each part is explained. X, Y, Z may be used for.

張出架設作業車1は、橋桁102の既設部分(以下「橋桁既設部分104」という)の前端部に設置される。張出架設作業車1は、橋桁既設部分104の上面に設置される移動作業車3と、移動作業車3により吊支持される下部作業床5とを備えている。 The overhanging erection work vehicle 1 is installed at the front end portion of the existing portion of the bridge girder 102 (hereinafter referred to as "existing portion 104 of the bridge girder"). The overhanging erection work vehicle 1 includes a mobile work vehicle 3 installed on the upper surface of the existing bridge girder portion 104, and a lower work floor 5 suspended and supported by the mobile work vehicle 3.

橋桁既設部分104の上面には橋軸方向に延在するレール105が敷設されており、移動作業車3はレール105上を橋軸方向に移動可能である。移動作業車3は、橋桁既設部分104の前端から前方に張り出すように設置される。移動作業車3は、橋軸直角方向に配列され互いに連結された複数のワーゲンフレーム7を備えている。ワーゲンフレーム7は、側面視において2つのトラスからなる略平行四辺形状をなしている。本実施形態では、移動作業車3は3体のワーゲンフレーム7を有している。3体のワーゲンフレーム7は互いに平行に橋軸直角方向に配列されている。各ワーゲンフレーム7の上部には、機材等を設置するための上部梁材9等が架け渡されている。この種の移動作業車は「ワーゲン」とも呼ばれる。 A rail 105 extending in the bridge axis direction is laid on the upper surface of the existing bridge girder portion 104, and the moving work vehicle 3 can move on the rail 105 in the bridge axis direction. The mobile work vehicle 3 is installed so as to project forward from the front end of the existing bridge girder portion 104. The mobile work vehicle 3 includes a plurality of Wagen frames 7 arranged in a direction perpendicular to the bridge axis and connected to each other. The Wagen frame 7 has a substantially parallel quadrilateral shape composed of two trusses in a side view. In the present embodiment, the mobile work vehicle 3 has three Wagen frames 7. The three Wagen frames 7 are arranged parallel to each other in the direction perpendicular to the bridge axis. An upper beam member 9 or the like for installing equipment or the like is hung on the upper part of each Wagen frame 7. This type of mobile work vehicle is also called a "wagen".

下部作業床5は、吊材11を介して移動作業車3によって吊支持されている。なお、本実施形態では移動作業車3の上部梁材9に接続される4対(合計8本)の吊材11が使用されている。下部作業床5は橋桁既設部分104の下方に位置している。下部作業床5の上面には、作業者が使用するための手摺り15や作業用足場17が適宜設置される。また、下部作業床5と橋桁既設部分104との間には型枠受梁19が配置され、型枠受梁19上には、橋桁102の底面に沿って橋軸方向に延在する複数(例えば約8本)のビーム材21が設置される。複数のビーム材21は、型枠受梁19上で等間隔で橋軸直角方向に並べられる。ビーム材21の上にはコンクリート型枠が組立てられ、橋桁102の一部が場所打ちコンクリートによって建造される。 The lower work floor 5 is suspended and supported by the moving work vehicle 3 via the suspension member 11. In this embodiment, four pairs (a total of eight) of hanging members 11 connected to the upper beam member 9 of the mobile work vehicle 3 are used. The lower work floor 5 is located below the existing bridge girder portion 104. On the upper surface of the lower work floor 5, a handrail 15 for use by an operator and a work scaffold 17 are appropriately installed. Further, a formwork receiving beam 19 is arranged between the lower work floor 5 and the existing bridge girder portion 104, and a plurality of formwork receiving beams 19 extend in the bridge axial direction along the bottom surface of the bridge girder 102 (on the formwork receiving beam 19). For example, about 8) beam materials 21 are installed. The plurality of beam materials 21 are arranged at equal intervals on the formwork beam 19 in the direction perpendicular to the bridge axis. A concrete formwork is assembled on the beam material 21, and a part of the bridge girder 102 is constructed by cast-in-place concrete.

下部作業床5の中央部には上下に貫通する矩形の開口25が設けられている。開口25は作業状況に応じて開閉が可能である。開口25は、4対の吊材11の接続箇所うち、前方の2対と後方の2対との間の位置に設けられている。この配置によれば、開口25が開いた状態において、矩形環状の構造を呈する下部作業床5が安定して吊支持される。橋桁102下方の地上又は水面上から橋桁102の施工現場に搬入される対象物は、開口25を通過して吊上げ移動される。また、施工現場から地上又は水面上に搬出される対象物は、開口25を通過して吊下げ移動される。開口25の詳細については後述する。 A rectangular opening 25 penetrating vertically is provided at the center of the lower work floor 5. The opening 25 can be opened and closed according to the work situation. The openings 25 are provided at positions between the two pairs at the front and the two pairs at the rear among the connection points of the four pairs of hanging members 11. According to this arrangement, the lower work floor 5 having a rectangular annular structure is stably suspended and supported in a state where the opening 25 is open. An object carried into the construction site of the bridge girder 102 from above the ground or above the water surface below the bridge girder 102 is lifted and moved through the opening 25. In addition, the object carried out from the construction site to the ground or the surface of the water is suspended and moved through the opening 25. Details of the opening 25 will be described later.

続いて、張出架設作業車1を用いて橋桁102の架設を行う施工方法の一例について説明する。本実施形態の橋梁100は斜張橋である。また、本実施形態の橋梁100では、橋桁102の少なくとも一部がプレキャスト部材によって建造される。具体的には、コンクリート場所打ちと斜材ケーブル設置とが繰り返されて、柱頭部103(図1参照)から所定の位置まで橋桁102が伸長される。その後、橋桁既設部分104の前端にプレキャスト部材である接合桁が施工され、当該接合桁に続いて更に前方に鋼桁が順次接続されていく。最終的には、隣の柱頭部103との中央の位置で、橋桁既設部分104同士の間に最後の鋼桁が接合され閉合される。 Subsequently, an example of a construction method for erection of the bridge girder 102 using the overhanging erection work vehicle 1 will be described. The bridge 100 of this embodiment is a cable-stayed bridge. Further, in the bridge 100 of the present embodiment, at least a part of the bridge girder 102 is constructed by precast members. Specifically, concrete cast-in-place and diagonal cable installation are repeated, and the bridge girder 102 is extended from the stigma 103 (see FIG. 1) to a predetermined position. After that, a joint girder, which is a precast member, is constructed at the front end of the existing bridge girder portion 104, and steel girders are sequentially connected to the front of the joint girder. Finally, at the central position with the adjacent capital 103, the last steel girder is joined and closed between the existing bridge girder portions 104.

以下、図2〜図4等を参照しながら、上記の接合桁の施行方法の一例について詳細に説明する。まず、図2及び図3に示されるように、橋桁既設部分104の前端まで移動作業車3が前進される。次に、移動作業車3の上部梁材9に複数台(本実施形態の場合は4台)のクライミングジャッキ27が設置される。設置されたクライミングジャッキ27は、接合桁31の設置予定位置Aの鉛直上方に位置する。また、設置予定位置Aの鉛直下方には下部作業床5の開口25が位置しており、この時点では開口25は閉じられている。また、この時点では、設置予定位置Aと開口25との間に、複数本のビーム材21が存在している。なお、図3においてはビーム材21の図示が省略されている。 Hereinafter, an example of the above-mentioned joining girder execution method will be described in detail with reference to FIGS. 2 to 4 and the like. First, as shown in FIGS. 2 and 3, the moving work vehicle 3 is advanced to the front end of the existing bridge girder portion 104. Next, a plurality of climbing jacks 27 (4 in the case of the present embodiment) are installed on the upper beam member 9 of the mobile work platform 3. The installed climbing jack 27 is located vertically above the planned installation position A of the joining girder 31. Further, an opening 25 of the lower work floor 5 is located vertically below the planned installation position A, and the opening 25 is closed at this point. Further, at this point, a plurality of beam materials 21 exist between the planned installation position A and the opening 25. Note that the beam material 21 is not shown in FIG.

更に開口25の鉛直下方には、台船29によって運び込まれた接合桁31(図4参照)が存在している。この接合桁31はプレキャスト部材として工場等で事前に製造されたものである。なお、ここでは、橋桁102の下方が水面であり接合桁31は台船29によって運び込まれる例を説明するが、橋桁102の下方が地面である場合には、例えばトレーラ等の車両によって接合桁31が運び込まれる。 Further, vertically below the opening 25, there is a joining girder 31 (see FIG. 4) carried by the pontoon 29. The joining girder 31 is manufactured in advance at a factory or the like as a precast member. Here, an example in which the lower part of the bridge girder 102 is the water surface and the joint girder 31 is carried by the pontoon 29 will be described. Is brought in.

次に、各ビーム材21(図2参照)が橋軸直角方向に移動され、型枠受梁19上で左右両端にそれぞれ纏められて設置される。これにより、開口25の鉛直上方に位置するビーム材21が除去される。次に、図4(a)に示されるように、下部作業床5の開口25が開かれる。なお、図4(a)に示されるような開口25の開き方の形態は一例であって、これに限定されるものではない。開口25の開閉機構については後述する。上記のようなビーム材21の移動及び開口25の開放によって、接合桁31の吊上げ経路が確保される。開口25は、接合桁31が上下方向に通過可能な寸法及び形状をなしている。開口25は、例えば、橋軸方向5〜10m、橋軸直角方向10〜20mの矩形をなす。 Next, each beam material 21 (see FIG. 2) is moved in the direction perpendicular to the bridge axis, and is installed together on the left and right ends on the formwork receiving beam 19. As a result, the beam material 21 located vertically above the opening 25 is removed. Next, as shown in FIG. 4A, the opening 25 of the lower work floor 5 is opened. The form of opening the opening 25 as shown in FIG. 4A is an example, and the present invention is not limited to this. The opening / closing mechanism of the opening 25 will be described later. By moving the beam material 21 and opening the opening 25 as described above, a lifting path for the joining girder 31 is secured. The opening 25 has dimensions and a shape that allow the joining girder 31 to pass in the vertical direction. The opening 25 forms, for example, a rectangle with a bridge axis direction of 5 to 10 m and a bridge axis perpendicular direction of 10 to 20 m.

続いて、図4(a)に示されるように、開いた開口25を通じて4つのクライミングジャッキ27と台船29上の接合桁31とが吊材35で接続される。吊材35としては、PC鋼線等が使用される。そして、図4(b)に示されるように、クライミングジャッキ27の駆動によって、接合桁31が台船29上から吊上げられ、開口25を通過して設置予定位置Aまで搬送される。 Subsequently, as shown in FIG. 4A, the four climbing jacks 27 and the joining girder 31 on the pontoon 29 are connected by the suspension member 35 through the open opening 25. As the hanging material 35, a PC steel wire or the like is used. Then, as shown in FIG. 4B, the joint girder 31 is lifted from the pontoon 29 by the drive of the climbing jack 27, passes through the opening 25, and is transported to the planned installation position A.

その後、図5(a)に示されるように、開口25が閉じられる。設置予定位置Aに到達した接合桁31は、橋桁既設部分104の先端に仮接合される。その後、ビーム材21が接合桁31の下方の配置に戻され、間詰めコンクリートのための鉄筋やコンクリート型枠37がビーム材21上に設けられる。なお、図5内に示されるクライミングジャッキ27は、適切なタイミングで撤去されてもよい。 After that, the opening 25 is closed, as shown in FIG. 5 (a). The joining girder 31 that has reached the planned installation position A is temporarily joined to the tip of the existing bridge girder portion 104. After that, the beam material 21 is returned to the arrangement below the joint girder 31, and reinforcing bars and concrete formwork 37 for the padded concrete are provided on the beam material 21. The climbing jack 27 shown in FIG. 5 may be removed at an appropriate timing.

その後、コンクリート型枠37にコンクリートが打設されて、図5(b)に示されるように橋桁既設部分104と接合桁31との間(図2に示される空間B)に間詰めコンクリート39が構築される。上記の接合桁31の仮接合、コンクリート型枠37の設置、及びコンクリートの打設・養生の作業時には、開口25は閉じられた状態であるので、開口25の上面も作業足場として使用することができる。また、閉じられた開口25の上面は、養生時に間詰めコンクリート39を加温するためのヒータの設置スペースとしても利用することができる。 After that, concrete is poured into the concrete formwork 37, and as shown in FIG. 5B, the padded concrete 39 is placed between the existing bridge girder portion 104 and the joint girder 31 (space B shown in FIG. 2). Will be built. Since the opening 25 is in a closed state during the temporary joining of the joining girder 31, the installation of the concrete formwork 37, and the work of placing and curing the concrete, the upper surface of the opening 25 can also be used as a work scaffold. can. Further, the upper surface of the closed opening 25 can also be used as an installation space for a heater for heating the interstitial concrete 39 during curing.

続いて、下部作業床5の開口25の開閉機構の例について説明する。開閉機構は、開口25の開放状態と閉鎖状態とを選択的に切替可能とする機構である。開放状態とは、前述のように吊上げ又は吊下げで搬送される対象物が、開口25を上下方向に通過可能な状態である。閉鎖状態とは、上記のような対象物が、開口25を上下方向に通過不可能な状態であり、開口25の上面を作業者の足場、又は機材・資材等の置き場として利用可能な状態である。 Subsequently, an example of the opening / closing mechanism of the opening 25 of the lower work floor 5 will be described. The opening / closing mechanism is a mechanism that can selectively switch between the open state and the closed state of the opening 25. The open state is a state in which an object to be lifted or suspended as described above can pass through the opening 25 in the vertical direction. The closed state is a state in which the above-mentioned object cannot pass through the opening 25 in the vertical direction, and the upper surface of the opening 25 can be used as a scaffolding for workers or a storage place for equipment and materials. be.

図6は、下部作業床5の平面図である。図6(a)等に示されるように、下部作業床5は、橋軸方向に延在し橋軸直角方向に複数列並べられた梁材51と、当該梁材51上に敷設された足場板材55とを備えている。下部作業床5上で開口25に対応する位置においては、梁材51は、開口25の前方に位置する前部梁材51aと、開口25の後方に位置する後部梁材51bと、に二分されており、開口25上には梁材51が存在しない。梁材51としては、例えばH鋼が使用される。 FIG. 6 is a plan view of the lower work floor 5. As shown in FIG. 6A and the like, the lower work floor 5 includes a beam member 51 extending in the bridge axis direction and arranged in a plurality of rows in a direction perpendicular to the bridge axis, and a scaffold laid on the beam member 51. It includes a plate material 55. At the position corresponding to the opening 25 on the lower work floor 5, the beam member 51 is divided into a front beam member 51a located in front of the opening 25 and a rear beam member 51b located behind the opening 25. There is no beam member 51 above the opening 25. As the beam member 51, for example, H steel is used.

図6(a)に示されるように、開口25の閉鎖状態では、開口25を横切るように橋軸方向に延在する開口部梁材53が橋軸直角方向に複数列並べられ設置されている。開口部梁材53は、前部梁材51aと後部梁材51bとに両持ち支持されている。開口25上では、開口部梁材53上に足場板材55が敷設されている。以下では、下部作業床5の足場板材55のうち、開口25上に敷設されたものを「足場板材55a」、それ以外の箇所に敷設されたものを「足場板材55b」、と区別して呼ぶ場合がある。上記のような開口部梁材53及び足場板材55aによって、開口25を開閉するための扉部57が構成されている。以下においても、複数の開口部梁材と開口部梁材上に敷設される足場板材とを有する部材を「扉部」と呼ぶ。 As shown in FIG. 6A, in the closed state of the opening 25, a plurality of rows of opening beam members 53 extending in the bridge axis direction so as to cross the opening 25 are arranged and installed in the direction perpendicular to the bridge axis. .. The opening beam member 53 is supported by both the front beam member 51a and the rear beam member 51b. On the opening 25, a scaffolding plate member 55 is laid on the opening beam member 53. In the following, among the scaffolding board 55 of the lower work floor 5, the one laid on the opening 25 is referred to as "scaffolding board 55a", and the one laid in other places is referred to as "scaffolding board 55b". There is. The door portion 57 for opening and closing the opening 25 is configured by the opening beam material 53 and the scaffolding plate material 55a as described above. Also in the following, a member having a plurality of opening beam members and a scaffolding board material laid on the opening beam members is referred to as a “door portion”.

図6(a)に示される開閉機構50Aでは、H鋼よりも軽量であり手作業で移動可能な部材(例えば角鋼管)が開口部梁材53として採用されている。また、開口部梁材53の両端は脱着可能な連結機構を介してそれぞれ前部梁材51aと後部梁材51bとに固定されている。そして、図6(b)に示されるように、足場板材55a及び開口部梁材53が開口25上から除去されることで、開口25が開放状態とされる。開口25上から除去された足場板材55a及び開口部梁材53は、下部作業床5上の他の位置に仮置きすればよい。この開閉機構50Aでは、前述の通り開口部梁材53が比較的軽量であり、作業者が開口部梁材53を手作業で比較的容易に移動可能であるので、手作業によって開口25を開閉することができる。 In the opening / closing mechanism 50A shown in FIG. 6A, a member (for example, a square steel pipe) that is lighter than H steel and can be manually moved is adopted as the opening beam member 53. Further, both ends of the opening beam member 53 are fixed to the front beam member 51a and the rear beam member 51b, respectively, via a detachable connecting mechanism. Then, as shown in FIG. 6B, the scaffolding plate member 55a and the opening beam member 53 are removed from above the opening 25, so that the opening 25 is opened. The scaffolding plate material 55a and the opening beam material 53 removed from above the opening 25 may be temporarily placed at other positions on the lower work floor 5. In this opening / closing mechanism 50A, as described above, the opening beam member 53 is relatively lightweight, and the operator can move the opening beam member 53 relatively easily by hand. Therefore, the opening 25 is manually opened and closed. can do.

図7(a)に示される開閉機構50Bでは、開口25の前端の位置において、ヒンジ構造部59を介して各開口部梁材53と各前部梁材51aとが連結されている。ヒンジ構造部59は、橋軸直角方向に平行な回転軸を有している。開口部梁材53と後部梁材51bとは、脱着可能な連結機構を介して連結されている。この開閉機構50Bでは、開口25の前端の位置を中心として扉部57を回動させることで、開口25が開閉可能である。なお、ヒンジ構造部59が開口25の後端の位置において開口部梁材53と後部梁材51bとの間に介在され、開口25の後端の位置を中心として扉部57を回動させるようにしてもよい。 In the opening / closing mechanism 50B shown in FIG. 7A, each opening beam member 53 and each front beam member 51a are connected via a hinge structure portion 59 at the position of the front end of the opening 25. The hinge structure 59 has a rotation axis parallel to the direction perpendicular to the bridge axis. The opening beam member 53 and the rear beam member 51b are connected via a detachable connecting mechanism. In this opening / closing mechanism 50B, the opening 25 can be opened / closed by rotating the door portion 57 around the position of the front end of the opening 25. The hinge structure portion 59 is interposed between the opening beam member 53 and the rear beam member 51b at the position of the rear end of the opening 25, and the door portion 57 is rotated around the position of the rear end of the opening 25. You may do it.

また、図7(b)に示される開閉機構50Cのように、扉部57が橋軸方向に前後二分割され、前扉部57aが開口25の前端位置のヒンジ構造部59aを中心として回転し、後扉部57bが開口25の後端位置のヒンジ構造部59bを中心として回転するようにしてもよい。この開閉機構によれば、扉部57を両開き状に開閉して開口25を開閉することができる。また、この場合、前扉部57aと後扉部57bとは所定の連結機構によって脱着可能に連結される。 Further, as in the opening / closing mechanism 50C shown in FIG. 7B, the door portion 57 is divided into two front and rear parts in the bridge axis direction, and the front door portion 57a rotates around the hinge structure portion 59a at the front end position of the opening 25. The rear door portion 57b may rotate about the hinge structure portion 59b at the rear end position of the opening 25. According to this opening / closing mechanism, the door portion 57 can be opened / closed in a double-opening manner to open / close the opening 25. Further, in this case, the front door portion 57a and the rear door portion 57b are detachably connected by a predetermined connecting mechanism.

図8(a)に示される開閉機構50Dでは、扉部57が橋軸直角方向に左右二分割されている。そして、下部作業床5は、分割された右扉部57cと左扉部57dとを橋軸直角方向にスライドさせるスライド機構を有している。当該スライド機構は、例えば、右扉部57c及び左扉部57dを橋軸直角方向に案内するレール等を有してもよい。この開閉機構50Dによれば、図8(b)に示されるように、右扉部57cと左扉部57dとを下部作業床5に沿って左右にスライドさせることで、開口25を開閉することができる。 In the opening / closing mechanism 50D shown in FIG. 8A, the door portion 57 is divided into left and right in the direction perpendicular to the bridge axis. The lower work floor 5 has a slide mechanism that slides the divided right door portion 57c and the left door portion 57d in the direction perpendicular to the bridge axis. The slide mechanism may have, for example, a rail or the like that guides the right door portion 57c and the left door portion 57d in the direction perpendicular to the bridge axis. According to the opening / closing mechanism 50D, as shown in FIG. 8B, the opening 25 is opened / closed by sliding the right door portion 57c and the left door portion 57d left and right along the lower work floor 5. Can be done.

また、図9(a)に示される開閉機構50Eのように、右扉部57cと左扉部57dとを橋軸方向にスライドさせてもよい。また、図9(b)に示されるように、扉部57を分割せずに、一体の扉部57を橋軸方向又は橋軸直角方向にスライドさせてもよい。 Further, as in the opening / closing mechanism 50E shown in FIG. 9A, the right door portion 57c and the left door portion 57d may be slid in the direction of the bridge axis. Further, as shown in FIG. 9B, the integrated door portion 57 may be slid in the bridge axis direction or the bridge axis perpendicular direction without dividing the door portion 57.

開閉機構50B〜50Eにおける各扉部57,57a,57b,57c,57dの移動は、例えば、チェーンブロック、電動モータ、チルホール等の駆動式を用いた手動装置又は自動装置を用いて適宜実行される。開口25の開閉機構は、上述した開閉機構50A〜50Eの各例には限定されない。すなわち、開口25の開放状態と閉鎖状態とを選択的に切替可能とする機構であれば、他の機構が採用されてもよい。 The movement of the door portions 57, 57a, 57b, 57c, 57d in the opening / closing mechanisms 50B to 50E is appropriately executed by using, for example, a manual device or an automatic device using a drive type such as a chain block, an electric motor, or a chill hole. .. The opening / closing mechanism of the opening 25 is not limited to each of the above-mentioned opening / closing mechanisms 50A to 50E. That is, another mechanism may be adopted as long as it is a mechanism that can selectively switch between the open state and the closed state of the opening 25.

続いて、上述の張出架設作業車1及び施工方法による作用効果について説明する。一般的に張出架設工法では、橋梁100の部材(例えば、接合桁31)、橋梁100の仮設資材、又は機材等を、外部から施工現場に搬入する作業又は施工現場から外部に搬出する作業が発生する。この場合の搬入される対象物は、張出架設作業車1の鉛直下方の位置(水面上又は地上)から移動作業車3によって吊上げて搬入することができ、また、搬出される対象物も移動作業車3によって吊下げて搬出することができる。このとき、移動作業車3の鉛直下方に位置する下部作業床5が搬送の邪魔になり得る。 Subsequently, the operation and effect of the above-mentioned overhanging erection work vehicle 1 and the construction method will be described. Generally, in the overhanging erection method, the work of bringing in the members of the bridge 100 (for example, the joint girder 31), the temporary materials of the bridge 100, the equipment, etc. from the outside to the construction site or the work of carrying them out from the construction site is performed. appear. In this case, the object to be carried in can be lifted by the moving work vehicle 3 from a position (above the water surface or above the ground) vertically below the overhanging erection work vehicle 1, and the object to be carried out can also be moved. It can be hung and carried out by the work vehicle 3. At this time, the lower work floor 5 located vertically below the mobile work vehicle 3 may interfere with the transportation.

これに対し、張出架設作業車1では、移動作業車3の吊位置(クライミングジャッキ27の位置)の鉛直下方に開口25が設けられているので、吊上げ又は吊下げ搬送される対象物を、開口25を上下方向に通過させて移動することができる。また、対象物の移動経路を空けるための準備作業としては、開口25を開放状態とする作業で済む。すなわち、下部作業床5自体を移動させたり、下部作業床5の一部を変形させたりする(例えば、前述の非特許文献1を参照)などの大掛りな作業が不要であるので、作業効率の向上が図られる。また、上記のような準備作業は高所で行われるため、安全性の確保に対する負担を強いられるところ、準備作業が簡素化されることにより安全性の向上にも寄与する。 On the other hand, in the overhanging erection work vehicle 1, since the opening 25 is provided vertically below the suspension position (the position of the climbing jack 27) of the mobile work vehicle 3, the object to be lifted or suspended and transported can be lifted or transported. It can be moved by passing through the opening 25 in the vertical direction. Further, as the preparatory work for opening the movement path of the object, the work of opening the opening 25 is sufficient. That is, since it is not necessary to perform large-scale work such as moving the lower work floor 5 itself or deforming a part of the lower work floor 5 (see, for example, Non-Patent Document 1 described above), work efficiency is not required. Is improved. In addition, since the above-mentioned preparatory work is performed at a high place, a burden is imposed on ensuring safety, and the simplification of the preparatory work also contributes to the improvement of safety.

また、開口25が開閉可能であることから、作業に応じて開口25を閉鎖状態とすることも可能である。開口25が閉鎖状態のときには、開口25の上面を作業者の足場、又は機材・資材等の置き場として有効に利用可能である。また、開口25は下部作業床5の中央部に設けられるので、開口25が開放状態の場合にも当該開口25の全周囲に足場板材55bが敷設されている状態であり、安全性が高い。 Further, since the opening 25 can be opened and closed, it is possible to close the opening 25 according to the work. When the opening 25 is in the closed state, the upper surface of the opening 25 can be effectively used as a scaffold for workers or a place for storing equipment and materials. Further, since the opening 25 is provided in the central portion of the lower work floor 5, the scaffolding plate material 55b is laid all around the opening 25 even when the opening 25 is open, which is highly safe.

なお、開口25を通過させて吊上げ又は吊下げ移動される対象物としては、前述の例のような接合桁31には限定されない。当該対象物の例としては、橋梁100の部材、橋梁100の仮設資材、又は機材が挙げられる。 The object to be lifted or hung and moved through the opening 25 is not limited to the joining girder 31 as in the above example. Examples of the object include a member of the bridge 100, a temporary material of the bridge 100, or equipment.

橋梁の部材とは、完成後の橋梁の一部を成す部材である。橋梁の部材には、例えば、前述の接合桁31のようなプレキャスト部材、斜張橋の斜材ケーブル、ハーフプレキャスト部材、主桁プレファブ、グラウト材、本設排水装置、鉄筋材、PC鋼材、ダイヤフラム構造部材、斜材定着体、鉄筋部材、支承装置、高欄などが含まれる。 A bridge member is a member that forms a part of a bridge after completion. Bridge members include, for example, precast members such as the above-mentioned joint girder 31, cable-stayed bridge diagonal cable, half precast members, main girder prefabs, grout materials, main drainage devices, reinforcing bars, PC steel materials, diaphragms. Structural members, cable-stayed members, reinforcing bar members, support devices, balustrades, etc. are included.

橋梁の仮設資材とは、一時的に橋梁の一部を成し完成時までに橋梁から除去される資材である。橋梁の仮設資材には、例えば、型枠材、支保工材、コンクリート養生材、足場材などコンクリートを保持又は形成するのに必要な部材が含まれる。 Temporary materials for bridges are materials that temporarily form part of the bridge and are removed from the bridge by the time it is completed. Temporary materials for bridges include, for example, formwork materials, support materials, concrete curing materials, scaffolding materials, and other members necessary for holding or forming concrete.

機材とは、橋梁の一部を成すもの以外で、張出架設工法に使用される機械等である。この機材には、例えば、前述のクライミングジャッキ27のようなジャッキ類、本設緊張用の斜材ジャッキ、養生用ヒータ設備、仮設排水用ポンプ設備、発電機、打設用バイブレータが含まれる。 The equipment is a machine or the like used in the overhanging erection method other than the one that forms a part of the bridge. This equipment includes, for example, jacks such as the climbing jack 27 described above, a diagonal jack for main tension, a heater for curing, a pump for temporary drainage, a generator, and a vibrator for driving.

上記のうち、斜張橋の斜材ケーブルを搬入する作業の例は、図10に示されるようなものである。図10(a)に示されるように、コンクリート場所打ち等で形成された橋桁先端部106が開口25の鉛直上方に位置している。斜材ケーブル61は台船29で張出架設作業車1の下方に運び込まれ、斜材ケーブル61の端部がクライミングジャッキ27によって台船29上から引き上げられる。斜材ケーブル61は、台船29上から索状に延びながら開口25を通過する。なお図10においては、斜材ケーブル61を引き上げるための吊材35の図示は省略されている。 Among the above, an example of the work of carrying in the cable-stayed bridge is as shown in FIG. As shown in FIG. 10A, the bridge girder tip 106 formed by casting concrete or the like is located vertically above the opening 25. The diagonal member cable 61 is carried below the overhanging erection work platform 1 by the pontoon 29, and the end portion of the diagonal member cable 61 is pulled up from above the pontoon 29 by the climbing jack 27. The diagonal cable 61 passes through the opening 25 while extending in a cord shape from the pontoon 29. In FIG. 10, the hanging member 35 for pulling up the diagonal member cable 61 is not shown.

その後、斜材ケーブル61の上端は、橋桁先端部106の前方から挿入され、斜材ケーブル設置孔に挿通される。斜材ケーブル61の上端は、橋桁既設部分104の上面から引き出され、橋梁100の塔(図示せず)に向けて斜め上方に引き上げられる。その後、図10(b)に示されるように、斜材ケーブル61の下端は、開口25を通過した後、橋桁先端部106の定着位置106aで定着される。その後、斜材ケーブル61の上端が更に斜め上方に引き上げられ、最終的に塔に定着されることで、斜材ケーブル61の設置が完了する。なお、上記のように斜材ケーブルを開口25に通過させて引上げる手法は、移動作業車3の前方に位置する橋桁先端部106の斜材ケーブル設置のみならず、移動作業車3の後方に位置する橋桁既設部分104の斜材ケーブル設置にも適用することができる。 After that, the upper end of the diagonal member cable 61 is inserted from the front of the bridge girder tip portion 106, and is inserted into the diagonal member cable installation hole. The upper end of the diagonal cable 61 is pulled out from the upper surface of the existing bridge girder portion 104, and is pulled up diagonally upward toward the tower (not shown) of the bridge 100. After that, as shown in FIG. 10B, the lower end of the diagonal member cable 61 is fixed at the fixing position 106a of the bridge girder tip portion 106 after passing through the opening 25. After that, the upper end of the diagonal member cable 61 is pulled up diagonally upward and finally fixed to the tower, so that the installation of the diagonal member cable 61 is completed. The method of passing the diagonal material cable through the opening 25 and pulling it up as described above is not only for installing the diagonal material cable at the tip 106 of the bridge girder located in front of the moving work vehicle 3, but also for installing the diagonal material cable behind the moving work vehicle 3. It can also be applied to the installation of diagonal cable of the existing portion 104 of the bridge girder located.

本発明は、上述した実施形態を始めとして、当業者の知識に基づいて種々の変更、改良を施した様々な形態で実施することができる。また、上述した実施形態に記載されている技術的事項を利用して変形例を構成することも可能である。各実施形態の構成を適宜組み合わせて使用してもよい。また、本発明の張出架設作業車の移動作業車は、ワーゲンと呼ばれるタイプのものに限定されず、エレクションノーズと呼ばれるタイプのものであってもよい。また、本発明における移動作業車は、移動式支保工または架設桁架設機であってもよい。 The present invention can be carried out in various forms having various modifications and improvements based on the knowledge of those skilled in the art, including the above-described embodiment. It is also possible to construct a modified example by utilizing the technical matters described in the above-described embodiment. The configurations of the respective embodiments may be combined and used as appropriate. Further, the mobile work vehicle of the overhanging erection work vehicle of the present invention is not limited to the type called Wagen, and may be of the type called erection nose. Further, the mobile work vehicle in the present invention may be a mobile support or an erection girder erection machine.

また実施形態では、開口25を通過させて下方から対象物を吊上げ移動させる例について説明したが、開口25を通過させて下方に対象物(例えば、使用済みの仮設資材等)を吊下げ移動させてもよい。また、実施形態では橋桁102の架設時の施工を例として説明したが、橋梁100の解体の施工に張出架設作業車1が使用されてもよい。例えば、解体で発生する橋梁の部材を張出架設作業車1を用いて台船29上に移動させる際に、開口25を通過させて当該部材を吊下げ移動させてもよい。 Further, in the embodiment, an example in which the object is lifted and moved from below by passing through the opening 25 has been described, but the object (for example, a used temporary material or the like) is suspended and moved downward by passing through the opening 25. You may. Further, in the embodiment, the construction at the time of erection of the bridge girder 102 has been described as an example, but the overhanging erection work vehicle 1 may be used for the construction of dismantling the bridge 100. For example, when the bridge member generated by the demolition is moved onto the pontoon 29 by using the overhanging erection work vehicle 1, the member may be suspended and moved by passing through the opening 25.

1…張出架設作業車、3…移動作業車、5…下部作業床、25…開口、31…接合桁(橋梁の部材、プレキャスト部材)、100…橋梁、102…橋桁。 1 ... Overhanging erection work vehicle, 3 ... Mobile work vehicle, 5 ... Lower work floor, 25 ... Opening, 31 ... Joint girder (bridge member, precast member), 100 ... Bridge, 102 ... Bridge girder.

Claims (4)

橋梁の架設又は解体に使用される張出架設作業車であって、
橋桁上に設置される移動作業車と、
前記移動作業車によって前記橋桁の下方の位置に吊支持される下部作業床と、を備え、
前記下部作業床には上下に貫通する開口が設けられており、
前記開口は前記橋梁の橋桁の一部をなすプレキャスト部材の設置位置の鉛直下方に位置し、前記移動作業車に吊られた前記プレキャスト部材が前記開口を通過して鉛直移動される、張出架設作業車。
An overhanging erection work vehicle used for erection or demolition of bridges.
A mobile work vehicle installed on the bridge girder and
A lower work floor, which is suspended and supported by the mobile work vehicle at a position below the bridge girder, is provided.
The lower work floor is provided with an opening that penetrates up and down .
The opening is located vertically below the installation position of the precast member forming a part of the bridge girder of the bridge, and the precast member suspended from the moving work vehicle is vertically moved through the opening. Work vehicle.
前記開口は開閉可能に設けられている、請求項に記載の張出架設作業車。 The overhanging erection work vehicle according to claim 1 , wherein the opening is provided so as to be openable and closable. 橋桁上に設置される移動作業車と、前記移動作業車によって前記橋桁の下方の位置に吊支持された下部作業床と、を備える張出架設作業車を使用して橋梁の架設又は解体を行う施工方法であって、
前記下部作業床には上下に貫通する開口が設けられており、
前記開口は前記橋梁の橋桁の一部をなすプレキャスト部材の設置位置の鉛直下方に位置し、前記移動作業車に吊られた前記プレキャスト部材が前記開口を通過して鉛直移動される工程を備える、施工方法。
A bridge is erected or demolished using an overhanging erection work vehicle provided with a mobile work vehicle installed on the bridge girder and a lower work floor suspended and supported by the mobile work vehicle at a position below the bridge girder. It ’s a construction method,
The lower work floor is provided with an opening that penetrates up and down .
The opening is located vertically below the installation position of the precast member forming a part of the bridge girder of the bridge, and includes a step of vertically moving the precast member suspended from the moving work vehicle through the opening. Construction method.
前記開口は開閉可能に設けられている、請求項に記載の施工方法。 The construction method according to claim 3 , wherein the opening is provided so as to be openable and closable.
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