JP2019019477A - Floor slab replacement method and portal crane - Google Patents

Floor slab replacement method and portal crane Download PDF

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JP2019019477A
JP2019019477A JP2017136548A JP2017136548A JP2019019477A JP 2019019477 A JP2019019477 A JP 2019019477A JP 2017136548 A JP2017136548 A JP 2017136548A JP 2017136548 A JP2017136548 A JP 2017136548A JP 2019019477 A JP2019019477 A JP 2019019477A
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floor slab
portal crane
crane
portal
tip support
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JP6867249B2 (en
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博幸 落合
Hiroyuki Ochiai
博幸 落合
重美 福島
Shigemi Fukushima
重美 福島
裕太 大山
Yuta Oyama
裕太 大山
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Sumitomo Mitsui Construction Co Ltd
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Sumitomo Mitsui Construction Co Ltd
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Abstract

To provide a floor slab replacement method capable of shortening a floor slab construction term without using a large crane or the like which requires installation space in the vicinity of a bridge, and a portal crane used for said replacement method.SOLUTION: A floor slab replacement method for a floor slab installed on a steel girder comprises: a process for preparing a portal crane which can be moved on the floor slab; a process for bringing an edge support part, provided on one end of the portal crane, into contact with the steel girder; a process for holding the portal crane on the floor slab; a process for removing the floor slab in a prescribed section along a bridge longer direction from the edge support part; and a process for installing a new floor slab at the position where the floor slab was removed.SELECTED DRAWING: Figure 1

Description

本発明は、橋梁の鋼桁上に架設されている既設床版を撤去し、新設プレキャスト床版に架け替える床版の交換方法及びこの床版の交換に用いる門型クレーンに関する。   The present invention relates to a floor slab replacement method in which an existing floor slab installed on a steel girder of a bridge is removed and replaced with a new precast floor slab, and a portal crane used for replacement of the floor slab.

橋梁に架設されている床版は、架設後複数年が経過すると、その老朽化に伴って既設床版を撤去して新設床版に架け替える据え付け工事を行う必要がある。このような新設床版の架け替えを行う据え付け工事は、種々の方法が知られている。   The floor slabs installed on the bridge will need to be installed to remove the existing floor slab and replace it with a new floor slab when it has been installed for several years. Various methods are known for such installation work for replacing a new floor slab.

例えば、既設床版は、鋼桁上に架設された鉄筋コンクリート製の床版が多く用いられているため、既設床版の撤去に際しては、既設床版を所定の大きさに切断したうえで、大型のクレーン車を用いて搬出している。   For example, reinforced concrete floor slabs installed on steel girders are often used for existing floor slabs. When removing existing floor slabs, the existing floor slabs are cut into a predetermined size and then large It is carried out using a crane truck.

また、特許文献１に記載されているように、昇降手段を備えた複数の走行台車を搬送すべき床版の前後に配置して床版を吊下させ、全走行台車を同期速度で橋面上を走行させ、軌条段差位置で先方走行台車の走行段差を盛替調整し、床版敷設位置で床版下の軌条を撤去して新床版を橋面上に据付け、新床版上に軌条を敷設し、先行走行台車の走行段差を盛り替え、全台車を戻り走行させ、次の床版の搬送・据付を繰り返すという床版の架設方法が知られている。   Moreover, as described in Patent Document 1, a plurality of traveling carriages provided with lifting means are arranged in front of and behind a floor slab to be transported to suspend the floor slab, and all traveling carriages are bridged at a synchronous speed. Drive on the rail, adjust the level difference of the traveling carriage at the rail step position, remove the rail under the floor slab at the floor laying position, install the new floor slab on the bridge surface, and on the new floor slab There is known a slab erection method in which rails are laid, the traveling steps of the preceding trolley are changed, all trolleys are moved back, and the next floor slab is repeatedly conveyed and installed.

このような床版の架設方法によれば、床版の幅が橋幅と一致し、橋軸直角方向寸法が１０ｍに達する大規模プレキャスト床版を架設することが可能となる。   According to such a slab erection method, it is possible to construct a large-scale precast slab in which the width of the slab coincides with the bridge width and the direction perpendicular to the bridge axis reaches 10 m.

特開２００３−７４０１８号公報Japanese Patent Laid-Open No. 2003-74018

しかし、従来の床版の交換方法によると、大型のクレーン車を用いた場合には、都市部など橋梁の近傍に構築物が多数あり、橋梁の近傍に大型クレーンを設置するスペースを確保することが難しく、橋面に大型クレーンを設置しても床版交換時はクレーンの旋回作業が伴うため、橋梁周りの施工状態から大型クレーンを用いた交換を行うことが難しいという問題があり、特許文献１に記載された架設方法のように門型クレーンを用いた場合であっても、走行台車を走行させる軌条を敷設する必要があり、このような軌条の敷設及び撤去作業が床版の交換作業に必要となり工期短縮を図ることが難しいという問題があった。   However, according to the conventional method of exchanging floor slabs, when a large crane is used, there are many structures in the vicinity of the bridge, such as in urban areas, and it is possible to secure a space for installing the large crane in the vicinity of the bridge. Even if a large crane is installed on the bridge surface, there is a problem that it is difficult to perform replacement using the large crane from the construction state around the bridge because the crane is turned when the slab is replaced. Even when a portal crane is used as in the construction method described in, it is necessary to lay a rail that runs the traveling carriage. There was a problem that it was necessary and it was difficult to shorten the construction period.

そこで、本発明は上記問題に鑑みてなされたものであり、橋梁の近傍に設置スペースを必要となる大型のクレーンなどを用いることなく、床版の工期短縮を図ることができる床版の交換方法、及びこの交換方法に用いられる門型クレーンを提供することを目的とする。   Therefore, the present invention has been made in view of the above problems, and a method for replacing a floor slab that can shorten the work period of the floor slab without using a large crane or the like that requires an installation space near the bridge. And a portal crane used in this replacement method.

本発明に係る床版の交換方法は、鋼桁に架設された床版の交換方法であって、前記床版上を移動可能な門型クレーンを準備する工程と、前記門型クレーンの一端に設けられた先端サポート部を前記鋼桁に当接させる工程と、前記門型クレーンを前記床版上に保持する工程と、前記先端サポート部から橋梁の長手方向に沿った所定の区間の前記床版を除去する工程と、前記床版を除去した位置に新たな床版を架設する工程とを備えることを特徴とする。   A floor slab replacement method according to the present invention is a floor slab replacement method installed on a steel girder, comprising a step of preparing a portal crane movable on the floor slab, and one end of the portal crane. A step of abutting a provided tip support portion against the steel girder, a step of holding the portal crane on the floor slab, and the floor in a predetermined section along the longitudinal direction of the bridge from the tip support portion The method includes a step of removing the plate and a step of installing a new floor slab at a position where the floor slab is removed.

また、本発明に係る床版の交換方法において、前記新たな床版を架設する際に、前記床版の勾配に沿って前記新たな床版を所定の方向に傾ける工程を備えると好適である。   Further, in the method for replacing a floor slab according to the present invention, it is preferable that a step of tilting the new floor slab in a predetermined direction along the gradient of the floor slab when the new floor slab is installed. .

また、本発明に係る床版の交換方法において、前記先端サポート部は、前記床版に形成された貫通孔を介して前記鋼桁に当接させると好適である。   In the floor slab replacement method according to the present invention, it is preferable that the tip support portion is brought into contact with the steel beam via a through hole formed in the floor slab.

また、本発明に係る床版の交換方法において、前記門型クレーンが前記床版上を自走して前記門型クレーンの位置を設定する工程を備えると好適である。   In the floor slab replacement method according to the present invention, it is preferable that the portal crane includes a step of self-propelling the floor slab to set the position of the portal crane.

また、本発明に係る門型クレーンは、鋼桁に架設された床版上を移動可能な移動手段が取り付けられた門型クレーン本体を備える門型クレーンであって、前記門型クレーン本体の一端に設けられると共に、前記鋼桁に当接可能に設けられた先端サポート部と、前記門型クレーン本体と前記先端サポート部の間の任意の位置に架設する新たな床版を吊り下げて移動せしめるクレーン部を備えることを特徴とする。   Further, the portal crane according to the present invention is a portal crane including a portal crane body to which a moving means capable of moving on a floor slab installed on a steel girder is attached, and one end of the portal crane body. And a tip support portion provided so as to be able to contact the steel girder and a new floor slab installed at an arbitrary position between the portal crane body and the tip support portion are suspended and moved. A crane portion is provided.

また、本発明に係る門型クレーンにおいて、前記先端サポート部は、前記床版の貫通孔に挿入可能な挿入部を備えると好適である。   Moreover, the portal crane which concerns on this invention WHEREIN: It is suitable for the said front-end | tip support part to be provided with the insertion part which can be inserted in the through-hole of the said floor slab.

また、本発明に係る門型クレーンにおいて、前記先端サポート部は、橋梁の傾斜勾配に応じて前記挿入部を傾斜又は突出し量を調整する傾斜調整手段を備える傾斜調整手段を備えると好適である。   Moreover, the portal crane which concerns on this invention WHEREIN: It is suitable for the said front-end | tip support part to provide the inclination adjustment means provided with the inclination adjustment means which adjusts the amount of inclination or protrusion of the said insertion part according to the inclination gradient of a bridge.

また、本発明に係る門型クレーンにおいて、前記クレーン部は、前記床版の勾配に沿って吊り下げた前記新たな床版の傾斜を調整する勾配調整手段を備えると好適である。   In the portal crane according to the present invention, it is preferable that the crane unit includes a slope adjusting unit that adjusts a slope of the new floor slab suspended along the slope of the floor slab.

また、本発明に係る門型クレーンにおいて、前記勾配調整手段は、複数のスクリュージャッキを用いて構成されると好適である。   In the portal crane according to the present invention, it is preferable that the gradient adjusting means is configured using a plurality of screw jacks.

また、本発明に係る門型クレーンにおいて、前記門型クレーン本体と前記先端サポート部の間で前記クレーン部によって吊り下げられた前記新たな床版を回転可能な回転手段を備えると好適である。   In the portal crane according to the present invention, it is preferable that the portal crane includes rotating means capable of rotating the new floor slab suspended by the crane portion between the portal crane body and the tip support portion.

上記発明の概要は、本発明の必要な特徴の全てを列挙したものではなく、これらの特徴群のサブコンビネーションもまた発明となり得る。   The above summary of the invention does not enumerate all the necessary features of the present invention, and sub-combinations of these features can also be the invention.

本発明に係る床版の交換方法によれば、門型クレーンの一端に設けられた先端サポート部を鋼桁に当接させる工程を備えているので、門型クレーンを支持する部材を別途設けることなく、門型クレーンの保持を図ることができる。また、本発明に係る門型クレーンは、先端サポート部が鋼桁に当接すると共に床版上を移動可能な移動手段を備えているので、門型クレーンを支持する部材や軌条などの部材を別途設けることなく門型クレーンの設置及び移動を図ることができる。したがって、橋梁の近傍に設置スペースを必要となる大型のクレーンなどを用いることなく、門型クレーンの準備にも別途部材を設けることなく、床版の工期短縮を図ることができる。   According to the method for replacing a floor slab according to the present invention, since a step of bringing the tip support portion provided at one end of the portal crane into contact with the steel girder is provided, a member for supporting the portal crane is separately provided. In addition, the portal crane can be held. In addition, the portal crane according to the present invention includes a moving means capable of moving on the floor slab while the tip support portion abuts on the steel girder. Therefore, a member for supporting the portal crane and a member such as a rail are separately provided. It is possible to install and move the portal crane without providing it. Therefore, it is possible to shorten the construction period of the floor slab without using a large crane or the like that requires an installation space in the vicinity of the bridge and without providing a separate member for preparing the portal crane.

本実施形態に係る門型クレーンの概要を説明するための図。The figure for demonstrating the outline | summary of the portal crane which concerns on this embodiment. 本実施形態に係る門型クレーンの正面図。The front view of the portal crane which concerns on this embodiment. 本実施形態に係る門型クレーンの先端サポート部を示す拡大図であって、（Ａ）は側面図、（Ｂ）は正面図を示す。It is an enlarged view which shows the front-end | tip support part of the portal crane which concerns on this embodiment, Comprising: (A) is a side view, (B) shows a front view. 本実施形態に係る門型クレーンのクレーン部を示す拡大図であって、（Ａ）は側面図、（Ｂ）は正面図を示す。It is an enlarged view which shows the crane part of the portal crane which concerns on this embodiment, Comprising: (A) is a side view, (B) shows a front view. 本実施形態に係る床版の交換方法を説明するための図であって、門型クレーンを準備する工程及び先端サポート部を鋼桁に当接させる工程を説明するための図。It is a figure for demonstrating the exchange method of the floor slab which concerns on this embodiment, Comprising: The figure for demonstrating the process of preparing a portal crane, and the process of making a front-end | tip support part contact | abut to a steel girder. 本実施形態に係る床版の交換方法を説明するための図であって、古い床版を除去する工程を説明するための図。It is a figure for demonstrating the replacement | exchange method of the floor slab which concerns on this embodiment, Comprising: The figure for demonstrating the process of removing an old floor slab. 本実施形態に係る床版の交換方法を説明するための図であって、古い床版の除去が完了した状態を示す図。It is a figure for demonstrating the replacement method of the floor slab which concerns on this embodiment, Comprising: The figure which shows the state which the removal of the old floor slab was completed. 本実施形態に係る床版の交換方法を説明するための図であって、新しい床版を架設する工程を説明するための図。It is a figure for demonstrating the replacement method of the floor slab which concerns on this embodiment, Comprising: The figure for demonstrating the process of constructing a new floor slab. 本実施形態に係る床版の交換方法を説明するための図であって、新しい床版を架設する工程を説明するための図。It is a figure for demonstrating the replacement method of the floor slab which concerns on this embodiment, Comprising: The figure for demonstrating the process of constructing a new floor slab. 本実施形態に係る床版の交換方法を説明するための図であって、床版の交換工程が完了し、次の床版の交換工程に移動する状態を説明するための図。It is a figure for demonstrating the replacement method of the floor slab which concerns on this embodiment, Comprising: The figure for demonstrating the state which the replacement process of a floor slab is completed and moves to the replacement | exchange process of the next floor slab.

以下、本発明を実施するための好適な実施形態について、図面を用いて説明する。なお、以下の実施形態は、各請求項に係る発明を限定するものではなく、また、実施形態の中で説明されている特徴の組み合わせの全てが発明の解決手段に必須であるとは限らない。   DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described with reference to the drawings. The following embodiments do not limit the invention according to each claim, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. .

図１は、本実施形態に係る門型クレーンの概要を説明するための図であり、図２は、本実施形態に係る門型クレーンの正面図であり、図３は、本実施形態に係る門型クレーンの先端サポート部を示す拡大図であって、（Ａ）は側面図、（Ｂ）は正面図を示す図であり、図４は、本実施形態に係る門型クレーンのクレーン部を示す拡大図であって、（Ａ）は側面図、（Ｂ）は正面図を示す図であり、図５は、本実施形態に係る床版の交換方法を説明するための図であって、門型クレーンを準備する工程及び先端サポート部を鋼桁に当接させる工程を説明するための図であり、図６は、本実施形態に係る床版の交換方法を説明するための図であって、古い床版を除去する工程を説明するための図であり、図７は、本実施形態に係る床版の交換方法を説明するための図であって、古い床版の除去が完了した状態を示す図であり、図８は、本実施形態に係る床版の交換方法を説明するための図であって、新しい床版を架設する工程を説明するための図であり、図９は、本実施形態に係る床版の交換方法を説明するための図であって、新しい床版を架設する工程を説明するための図であり、図１０は、本実施形態に係る床版の交換方法を説明するための図であって、床版の交換工程が完了し、次の床版の交換工程に移動する状態を説明するための図である。   FIG. 1 is a diagram for explaining an outline of a portal crane according to this embodiment, FIG. 2 is a front view of the portal crane according to this embodiment, and FIG. 3 is according to this embodiment. It is an enlarged view which shows the front-end | tip support part of a portal crane, Comprising: (A) is a side view, (B) is a figure which shows a front view, FIG. 4 shows the crane part of the portal crane which concerns on this embodiment. (A) is a side view, (B) is a diagram showing a front view, and FIG. 5 is a diagram for explaining a method for replacing a floor slab according to the present embodiment, FIG. 6 is a diagram for explaining a step of preparing a portal crane and a step of bringing the tip support part into contact with a steel beam, and FIG. 6 is a diagram for explaining a method for replacing a floor slab according to the present embodiment. FIG. 7 is a diagram for explaining a process of removing an old floor slab, and FIG. 7 is a method for replacing a floor slab according to the present embodiment. It is a figure for demonstrating, Comprising: It is a figure which shows the state which removal of the old floor slab was completed, FIG. 8 is a figure for demonstrating the replacement method of the floor slab which concerns on this embodiment, Comprising: A new floor FIG. 9 is a diagram for explaining a process for laying a plate, and FIG. 9 is a diagram for explaining a method for replacing a floor slab according to the present embodiment, for explaining a process for installing a new slab. FIG. 10 is a diagram for explaining a method for replacing a floor slab according to the present embodiment, and illustrates a state in which the floor slab replacement process is completed and the process moves to the next floor slab replacement process. It is a figure for doing.

まず、本実施形態に係る床版の交換方法に好適に用いられる門型クレーン１０について説明を行う。本実施形態に係る床版の交換方法は、図１に示すように、橋梁５０の鋼桁４０に架設された古い床版１４１を新たな床版４１に交換する交換方法であって、本実施形態に係る門型クレーン１０は、古い床版１４１上を移動可能な移動手段１２が取り付けられた一対の脚枠１５，１５と、該一対の脚枠１５，１５の上端を連結して概略門型の門型クレーン本体１１を構成する天枠１４と、門型クレーン本体１１の一端に設けられた先端サポート部２０とを備えている。天枠１４の橋梁５０の長手方向に沿った長さは、脚枠１５よりも長く形成されており、これによって、先端サポート部２０と門型クレーン本体１１の間には、作業スペース６０が形成されている。   First, the portal crane 10 used suitably for the floor slab replacement method according to the present embodiment will be described. The floor slab replacement method according to the present embodiment is a replacement method in which an old floor slab 141 installed on a steel girder 40 of a bridge 50 is replaced with a new floor slab 41 as shown in FIG. The portal crane 10 according to the embodiment is configured by connecting a pair of leg frames 15 and 15 to which a moving means 12 movable on an old floor slab 141 is attached, and upper ends of the pair of leg frames 15 and 15. The top-type frame 14 which comprises the type | mold portal crane body 11 and the front-end | tip support part 20 provided in the end of the portal crane body 11 are provided. The length of the top frame 14 along the longitudinal direction of the bridge 50 is longer than that of the leg frame 15, whereby a work space 60 is formed between the tip support portion 20 and the portal crane body 11. Has been.

図２に示すように、脚枠１５の下端に設けられた移動手段１２は、電動モータ等の周知の駆動手段によって回転駆動可能な車輪１６が取り付けらえており、該車輪の回転によって門型クレーン１０を既設の古い床版１４１上で移動可能としている。   As shown in FIG. 2, the moving means 12 provided at the lower end of the leg frame 15 is provided with a wheel 16 that can be driven to rotate by known driving means such as an electric motor. 10 can be moved on the existing old floor slab 141.

また、脚枠１５の下端には、古い床版１４１に当接可能な固定ジャッキ１３を備えている。固定ジャッキ１３は、周知のジャッキ機構が好適に用いられるが、例えば油圧ジャッキなどを用いると好適である。固定ジャッキ１３は、移動手段１２によって門型クレーン１０を所定の位置に移動させた後、当該位置に門型クレーン１０を固定するために用いられる。   In addition, a fixed jack 13 capable of contacting the old floor slab 141 is provided at the lower end of the leg frame 15. As the fixed jack 13, a known jack mechanism is preferably used. For example, a hydraulic jack or the like is preferably used. The fixed jack 13 is used to fix the portal crane 10 to the position after the portal crane 10 is moved to a predetermined position by the moving means 12.

門型クレーン本体１１の天枠１４には、長手方向に沿ってクレーン用レール３４が設けられており、該クレーン用レール３４には、後述するクレーン部３０が移動可能に取り付けられている。   A crane rail 34 is provided on the top frame 14 of the portal crane main body 11 along the longitudinal direction, and a crane section 30 described later is movably attached to the crane rail 34.

先端サポート部２０は、天枠１４の一端から垂下するように取り付けられており、先端サポート部２０の下方には、傾斜調整手段２１を介して新たな床版４１の貫通孔４３に挿入可能な挿入部２２が設けられている。図３（Ａ）及び（Ｂ）に示すように、先端サポート部２０は、天枠１４から垂下する支持腕２４と、支持腕２４の下端に傾斜調整手段２１を介して取り付けられた保持板２３を備えている。保持板２３には、床版４１に形成された貫通孔４３に対応した複数の挿入部２２が形成されており、本実施形態に係る門型クレーン１０では、貫通孔４３の数や位置に応じて幅方向に４つの挿入部２２の列を長手方向に２列備え、合計で８つの挿入部２２を備えている。   The tip support portion 20 is attached so as to hang from one end of the top frame 14. The tip support portion 20 can be inserted into the through hole 43 of the new floor slab 41 via the inclination adjusting means 21 below the tip support portion 20. An insertion portion 22 is provided. As shown in FIGS. 3A and 3B, the tip support portion 20 includes a support arm 24 that hangs down from the top frame 14, and a holding plate 23 that is attached to the lower end of the support arm 24 via an inclination adjusting means 21. It has. In the holding plate 23, a plurality of insertion portions 22 corresponding to the through holes 43 formed in the floor slab 41 are formed. In the portal crane 10 according to this embodiment, depending on the number and positions of the through holes 43. Thus, two rows of four insertion portions 22 in the width direction are provided in the longitudinal direction, and a total of eight insertion portions 22 are provided.

また、傾斜調整手段２１は、保持板２３を橋梁５０の傾斜勾配に応じて傾斜可能に取り付けており、具体的には、図３（Ｂ）に示すように、支持腕２４の一端に保持板２３の幅方向に沿ってピンを挿入し、該ピンの周方向に保持板２３を揺動自在に保持することで橋梁５０の長手方向に沿った縦断勾配の傾斜勾配に応じて保持板２３を傾斜可能に取り付けている。   In addition, the inclination adjusting means 21 has the holding plate 23 attached so as to be able to incline according to the inclination gradient of the bridge 50. Specifically, as shown in FIG. The pin 23 is inserted along the width direction of the pin 23, and the holding plate 23 is swingably held in the circumferential direction of the pin, so that the holding plate 23 is adjusted according to the inclination of the longitudinal gradient along the longitudinal direction of the bridge 50. It can be tilted.

さらに、図３（Ａ）に示すように、幅方向の傾斜については、所定の厚さを有する高さ調整板２５を介して挿入部２２を取り付けることで、挿入部２２の突出し量を調整することで幅方向の横断勾配に応じた高さ調整を行うことが可能となっている。このような傾斜調整手段２１によって、橋梁５０が所定の勾配を有していた場合であっても、挿入部２２を確実に鋼桁４０に当接させて門型クレーン１０を保持することができる。   Furthermore, as shown in FIG. 3A, with respect to the inclination in the width direction, the insertion portion 22 is attached via a height adjustment plate 25 having a predetermined thickness, thereby adjusting the protruding amount of the insertion portion 22. This makes it possible to adjust the height according to the transverse gradient in the width direction. Even if the bridge 50 has a predetermined gradient, the portal crane 10 can be held by reliably bringing the insertion portion 22 into contact with the steel beam 40 even when the bridge 50 has a predetermined slope. .

図４（Ａ）及び（Ｂ）に示すように、クレーン部３０は、クレーン用レール３４から吊り下げられた吊下部３５と、吊下部３５に対して回転手段３３を介して鉛直方向を軸に回転可能に組み付けられた保持板３６とを備えている。保持板３６には、勾配調整手段３１を介してフック部３２が取り付けられており、該フック部３２を新たな床版４１に設けられた被フック部４４に係合させて床版４１の移動及び設置を行うことができる。   As shown in FIGS. 4A and 4B, the crane unit 30 includes a suspended portion 35 suspended from a crane rail 34, and a vertical direction with respect to the suspended portion 35 via a rotating means 33. And a holding plate 36 that is rotatably assembled. A hook portion 32 is attached to the holding plate 36 via a gradient adjusting means 31, and the hook portion 32 is engaged with a hooked portion 44 provided on a new floor slab 41 to move the floor slab 41. And can be installed.

回転手段３３は、保持板３６を鉛直方向を軸に回転させることができれば如何なる構成を備えても構わないが、例えば電動モータによる駆動力をベアリングなどの軸受部材を介して荷重を保持するように構成すると好適である。   The rotating means 33 may have any configuration as long as the holding plate 36 can be rotated about the vertical direction. For example, a driving force by an electric motor is used to hold a load via a bearing member such as a bearing. It is preferable to configure.

また、勾配調整手段３１は、床版４１を架設する際に、橋梁５０の傾斜勾配に沿って床版４１を架設することができるように床版４１自体を傾斜させる機構を有しており、例えばフック部３２をスクリュージャッキを介して保持板３６に取り付けることで、該スクリュージャッキによってフック部３２の垂下する長さを調整して床版４１の勾配を調整することができる。なお、スクリュージャッキは、図４（Ａ）及び（Ｂ）に示すように、保持板３６の四隅に合計４つ備えると橋梁５０の長手方向及び幅方向の双方の勾配を調整することができる。   The gradient adjusting means 31 has a mechanism for inclining the floor slab 41 itself so that the floor slab 41 can be installed along the inclination gradient of the bridge 50 when the floor slab 41 is installed. For example, by attaching the hook portion 32 to the holding plate 36 via a screw jack, the slope of the floor slab 41 can be adjusted by adjusting the length of the hook portion 32 depending on the screw jack. As shown in FIGS. 4A and 4B, when four screw jacks are provided at the four corners of the holding plate 36, the gradient in both the longitudinal direction and the width direction of the bridge 50 can be adjusted.

次に、本実施形態に係る門型クレーン１０を用いた床版の交換方法について説明を行う。第一に、図５に示すように、門型クレーン１０を古い床版１４１上で走行させて交換を行う床版の位置に作業スペース６０が重畳するように移動する。このとき、門型クレーン１０は、橋梁５０上で組み立てても構わないし、トラックなどの搬送手段を備えた車両から床版上に移動させても構わない。   Next, a floor slab replacement method using the portal crane 10 according to the present embodiment will be described. First, as shown in FIG. 5, the portal crane 10 is moved on the old floor slab 141 so that the work space 60 is superimposed on the position of the floor slab to be replaced. At this time, the portal crane 10 may be assembled on the bridge 50, or may be moved onto a floor slab from a vehicle equipped with transport means such as a truck.

門型クレーン１０を所定の位置に移動した後、脚枠１５に備えられた固定ジャッキ１３によって古い床版１４１上に門型クレーン１０が移動しないように設置する。そして、すでに架設が終わった新たな床版４１の貫通孔４３に先端サポート部２０に形成された挿入部２２を挿入して、鋼桁４０に該挿入部２２を当接させる。このように、門型クレーン１０は、固定ジャッキ１３と挿入部２２とによって橋梁５０に固定設置される。このとき、移動手段１２は、軌条の敷設作業を不要とするので、工期短縮に寄与し、挿入部２２によって門型クレーン１０の先端を鋼桁４０によって支持しているので、門型クレーン１０を確実に支持することが可能となる。   After the portal crane 10 is moved to a predetermined position, the portal crane 10 is installed on the old floor slab 141 by the fixed jack 13 provided on the leg frame 15 so as not to move. And the insertion part 22 formed in the front-end | tip support part 20 is inserted in the through-hole 43 of the new floor slab 41 already erected, and this insertion part 22 is made to contact | abut with the steel girder 40. FIG. As described above, the portal crane 10 is fixedly installed on the bridge 50 by the fixed jack 13 and the insertion portion 22. At this time, since the moving means 12 does not require the work of laying the rail, it contributes to the shortening of the construction period, and the distal end of the portal crane 10 is supported by the steel girder 40 by the insertion portion 22. It becomes possible to support it reliably.

次に、図６に示すように、作業スペース６０に架設されている古い床版１４１の除去作業を行う。除去作業は、橋梁５０の長手方向に沿った所定の区間の古い床版１４１を除去し、例えば幅方向に二分割に切断してクレーン部３０によって切断除去した古い床版１４１を除去していく。   Next, as shown in FIG. 6, an old floor slab 141 installed in the work space 60 is removed. In the removing operation, the old floor slab 141 in a predetermined section along the longitudinal direction of the bridge 50 is removed. For example, the old floor slab 141 cut into two parts in the width direction and cut and removed by the crane unit 30 is removed. .

図７に示すように、作業スペース６０における古い床版１４１の除去が完了すると、鋼桁４０のフランジ面の清掃を行った後、新たな床版の架設を行う。図８に示すように、新たな床版４１は、橋梁の幅方向に長い長尺の部材であることから、搬入トラック７０によって長手方向に沿った方向で搬入される。この状態で、クレーン部３０によって新たな床版４１を吊り下げ、作業スペース６０まで移動させる。   As shown in FIG. 7, when the removal of the old floor slab 141 in the work space 60 is completed, the flange surface of the steel girder 40 is cleaned, and then a new floor slab is installed. As shown in FIG. 8, the new floor slab 41 is a long member that is long in the width direction of the bridge, and is therefore carried in by the carry-in truck 70 in the direction along the longitudinal direction. In this state, a new floor slab 41 is suspended by the crane unit 30 and moved to the work space 60.

そして、図９に示すように、作業スペース６０でクレーン部３０の回転手段３３によって新たな床版４１を略９０度回転させて、新たな床版４１を鋼桁４０に据付ける。その後、同様の作業を繰り返し、作業スペース６０における古い床版１４１を除去した位置に新たな床版４１を敷き詰めるように据付ける。最後に、据付けられた新たな床版４１の貫通孔４３にスタッドジベルを打ち込み、貫通孔にモルタルを流し込んで鋼桁４０と接合する。なお、新たな床版４１の据付けの際に、新たな床版４１と鋼桁４０の間に高さ調整のためのピンなどを用いて新たな床版４１のレベル合わせを行う。その後、図１０に示すように、床版の交換工程が完了し、次の床版の交換工程に移動して図５の状態で次の床版の交換工程に移行する。このように、交換が必要な床版の交換が完了するまで交換工程を繰り返し行って床版の交換を行う。   Then, as shown in FIG. 9, the new floor slab 41 is rotated approximately 90 degrees by the rotating means 33 of the crane unit 30 in the work space 60, and the new floor slab 41 is installed on the steel girder 40. Thereafter, the same operation is repeated, and a new floor slab 41 is installed in the work space 60 at a position where the old floor slab 141 is removed. Finally, a stud diver is driven into the through hole 43 of the newly installed floor slab 41, and mortar is poured into the through hole to join the steel girder 40. When the new floor slab 41 is installed, the level of the new floor slab 41 is adjusted between the new floor slab 41 and the steel girder 40 using a pin for adjusting the height. After that, as shown in FIG. 10, the floor slab replacement process is completed, and the process proceeds to the next floor slab replacement process, and the process proceeds to the next floor slab replacement process in the state of FIG. Thus, the replacement process is repeated until the replacement of the floor slabs that need to be replaced is completed.

続いて、次の作業箇所へ門型クレーン１０を移動させて古い床版１４１の交換作業を連続して行う。   Subsequently, the portal crane 10 is moved to the next work location, and the replacement work of the old floor slab 141 is continuously performed.

このように構成された古い床版の交換方法によれば、古い床版上を移動可能な門型クレーン１０を用いているので、軌条の敷設及び撤去作業を必要としないと共に、大型のクレーンなどを必要としないことから、都市部など大型クレーンを設置するスペースを十分に確保することができない場所でも古い床版の交換作業を行うことが可能となり、工期の短縮を図ることができる。また、門型クレーンの先端サポート部を鋼桁に当接させて支持し、先端サポート部と門型クレーン本体の間を作業スペースとして確保することで、重量物となる交換前後の床版を確実に保持して交換作業を確実に行うことができる。   According to the replacement method of the old floor slab configured in this way, the portal crane 10 that can be moved on the old floor slab is used, so that it is not necessary to lay and remove the rail, and a large crane or the like. Therefore, it is possible to replace the old floor slab even in a place such as an urban area where sufficient space for installing a large crane cannot be secured, thereby shortening the construction period. In addition, the tip support part of the portal crane is supported by contacting the steel girder, and the space between the tip support part and the portal crane body is secured as a work space, so that the floor slab before and after replacement, which becomes a heavy load, can be secured. Therefore, the replacement work can be performed reliably.

以上説明したように、上述した本実施形態に係る床版の交換方法では、古い床版を二分割に切断して除去する場合について説明を行ったが、二分割に限定されず、三分割以上または、分割せずに古い床版の除去を行っても構わない。その様な変更又は改良を加えた形態も本発明の技術的範囲に含まれうることが、特許請求の範囲の記載から明らかである。   As described above, in the floor slab replacement method according to the above-described embodiment, the case where the old floor slab is cut and removed in two parts has been described. However, the present invention is not limited to two parts and is not less than three parts. Alternatively, the old floor slab may be removed without dividing. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

１０ 門型クレーン， １１ 門型クレーン本体， １２ 移動手段， １３ ジャッキ， １４ 天枠， １５ 脚枠， １６ 車輪， ２０ 先端サポート部， ２１ 傾斜調整手段， ２２ 挿入部， ２３ 保持板， ２４ 支持腕， ２５ 高さ調整板， ３０ クレーン部， ３１ 勾配調整手段， ３２ フック部， ３３ 回転手段， ３４ クレーン用レール， ３５ 吊下部， ３６ 保持板， ４０ 鋼桁， ４１ 新たな床版， ４３ 貫通孔， ４４ 被フック部， ５０ 橋梁， ６０ 作業スペース， １４１ 古い床版。   DESCRIPTION OF SYMBOLS 10 Gate type crane, 11 Gate type crane main body, 12 Moving means, 13 Jack, 14 Top frame, 15 Leg frame, 16 Wheel, 20 Tip support part, 21 Inclination adjustment means, 22 Insertion part, 23 Holding plate, 24 Support arm , 25 Height adjusting plate, 30 Crane part, 31 Gradient adjusting means, 32 Hook part, 33 Rotating means, 34 Crane rail, 35 Hanging lower part, 36 Holding plate, 40 Steel girder, 41 New floor slab, 43 Through hole , 44 hooked part, 50 bridge, 60 working space, 141 old floor slab.

Claims (10)

鋼桁に架設された床版の交換方法であって、
前記床版上を移動可能な門型クレーンを準備する工程と、
前記門型クレーンの一端に設けられた先端サポート部を前記鋼桁に当接させる工程と、
前記門型クレーンを前記床版上に保持する工程と、
前記先端サポート部から橋梁の長手方向に沿った所定の区間の前記床版を除去する工程と、
前記床版を除去した位置に新たな床版を架設する工程とを備えることを特徴とする床版の交換方法。 A method for replacing a floor slab installed on a steel girder,
Preparing a portal crane movable on the floor slab;
Contacting the steel beam with a tip support portion provided at one end of the portal crane;
Holding the portal crane on the floor slab;
Removing the floor slab in a predetermined section along the longitudinal direction of the bridge from the tip support portion;
And a step of laying a new floor slab at a position where the floor slab is removed. 請求項１に記載の床版の交換方法において、
前記新たな床版を架設する際に、前記床版の勾配に沿って前記新たな床版を所定の方向に傾ける工程を備えることを特徴とする床版の交換方法。 The floor slab replacement method according to claim 1,
A method of replacing a floor slab comprising the step of inclining the new floor slab in a predetermined direction along the gradient of the floor slab when the new floor slab is installed. 請求項１又は２に記載の床版の交換方法において、
前記先端サポート部は、前記床版に形成された貫通孔を介して前記鋼桁に当接させることを特徴とする床版の交換方法。 In the replacement method of the floor slab according to claim 1 or 2,
The tip support part is brought into contact with the steel beam via a through hole formed in the floor slab. 請求項１から３のいずれか１項に記載の床版の交換方法において、
前記門型クレーンが前記床版上を自走して前記門型クレーンの位置を設定する工程を備えることを特徴とする床版の交換方法。 In the replacement method of the floor slab according to any one of claims 1 to 3,
A method for replacing a floor slab, comprising the step of the portal crane self-propelled on the floor slab to set the position of the portal crane. 鋼桁に架設された床版上を移動可能な移動手段が取り付けられた門型クレーン本体を備える門型クレーンであって、
前記門型クレーン本体の一端に設けられると共に、前記鋼桁に当接可能に設けられた先端サポート部と、
前記門型クレーン本体と前記先端サポート部の間の任意の位置に架設する新たな床版を吊り下げて移動せしめるクレーン部を備えることを特徴とする門型クレーン。 A portal crane comprising a portal crane body with a moving means attached to a floor slab erected on a steel girder,
Provided at one end of the portal crane body, a tip support portion provided so as to be able to contact the steel beam,
A portal crane comprising a crane section for suspending and moving a new floor slab installed at an arbitrary position between the portal crane main body and the tip support section. 請求項５に記載の門型クレーンにおいて、
前記先端サポート部は、前記床版の貫通孔に挿入可能な挿入部を備えることを特徴とする門型クレーン。 The portal crane according to claim 5,
The portal crane according to claim 1, wherein the tip support portion includes an insertion portion that can be inserted into the through hole of the floor slab. 請求項６に記載の門型クレーンにおいて、
前記先端サポート部は、橋梁の傾斜勾配に応じて前記挿入部を傾斜又は突出し量を調整する傾斜調整手段を備えることを特徴とする門型クレーン。 The portal crane according to claim 6, wherein
The portal support crane according to claim 1, wherein the tip support portion includes an inclination adjusting means for adjusting an amount of inclination or protrusion of the insertion portion in accordance with an inclination gradient of the bridge. 請求項５から７のいずれか１項に記載の門型クレーンにおいて、
前記クレーン部は、前記床版の勾配に沿って吊り下げた前記新たな床版の傾斜を調整する勾配調整手段を備えることを特徴とする門型クレーン。 In the portal crane according to any one of claims 5 to 7,
The said crane part is equipped with the gradient adjustment means which adjusts the inclination of the said new floor slab suspended along the gradient of the said floor slab, The portal crane characterized by the above-mentioned. 請求項８に記載の門型クレーンにおいて、
前記勾配調整手段は、複数のスクリュージャッキを用いて構成されることを特徴とする門型クレーン。 The portal crane according to claim 8, wherein
The said gradient adjustment means is comprised using a some screw jack, The portal crane characterized by the above-mentioned. 請求項５から９のいずれか１項に記載の門型クレーンにおいて、
前記門型クレーン本体と前記先端サポート部の間で前記クレーン部によって吊り下げられた前記新たな床版を回転可能な回転手段を備えることを特徴とする門型クレーン。 The portal crane according to any one of claims 5 to 9,
A portal crane comprising rotating means capable of rotating the new floor slab suspended by the crane portion between the portal crane body and the tip support portion.
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JP2020133165A (en) * 2019-02-15 2020-08-31 三信工業株式会社 Precast floor slab laying device
JP7467729B1 (en) 2023-05-30 2024-04-15 大成建設株式会社 Conveyor

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JP2020133165A (en) * 2019-02-15 2020-08-31 三信工業株式会社 Precast floor slab laying device
JP7467729B1 (en) 2023-05-30 2024-04-15 大成建設株式会社 Conveyor

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