JP2021085172A - Bridge floor slab cutting device and method - Google Patents

Bridge floor slab cutting device and method Download PDF

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JP2021085172A
JP2021085172A JP2019213048A JP2019213048A JP2021085172A JP 2021085172 A JP2021085172 A JP 2021085172A JP 2019213048 A JP2019213048 A JP 2019213048A JP 2019213048 A JP2019213048 A JP 2019213048A JP 2021085172 A JP2021085172 A JP 2021085172A
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pulley
wire
deck
conversion
floor slab
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JP7290320B2 (en
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松原裕行
Hiroyuki Matsubara
中村直見
Naomi Nakamura
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Consec Corp
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Abstract

To provide a bridge floor slab cutting device that allows one worker under a floor slab to easily adjust a vertical position of a conversion pulley for horizontal cutting attached to a support rod under the floor slab in a bridge renewal method.SOLUTION: A cutting device comprises: a support 21 installed vertically on a floor slab 1; a drive pulley 22 supported by the floor slab 1 so as to be able to move up and down, rotationally driven on the floor slab 1 by a drive device, and moved up and down by a lifting mechanism; and a pulley device 27 attached to positions protruding from the floor slab 1 where support rods 25 are passed through vertical holes 37 formed on both sides of a convex section of the floor slab 1 supported by a steel girder 9 in a downwardly bulging floor slab convex part 1a and having conversion pulleys 24a, 24b, 26a, 26b on which a wire 28 is hung. The pulley device 27 includes a lower conversion pulley 33a and an upper conversion pulley 33b. The wire 28 hung on the upper conversion pulley 33b above the lower conversion pulley 33a through the vertical hole 37 is positioned at a horizontal cutting position of the floor slab convex part 1a.SELECTED DRAWING: Figure 2

Description

本発明は、橋梁のリニューアル工法において、コンクリート製床版取替えのため、鋼桁より床版を取外すのに用いる床版の切断装置及び方法に関する。 The present invention relates to a deck cutting device and method used for removing a deck from a steel girder for replacing a concrete deck in a bridge renewal method.

橋梁の老朽化対策の一環として行われる床版の取替工事に際しては、既設の床版取外しのため、橋脚上に横架される鋼桁にアンカーボルトにより固定される床版下に膨出する凸部がアンカーボルトと共に切断される。 When replacing the floor slab, which is carried out as part of measures to prevent the deterioration of the bridge, the existing floor slab is removed, so it bulges under the floor slab, which is fixed to the steel girder laid on the pier by anchor bolts. The protrusion is cut with the anchor bolt.

図１は、下記特許文献１に開示される装置と同様な切断装置について示すもので、この装置は、床版１に縦設される支柱２と、該支柱２に昇降可能に取付けられ、図示しないピニオンラック機構よりなる昇降機構により昇降すると共に、モータを含む回転駆動機構により回転駆動される駆動プーリ３と、支柱下部に横架される取付棒４と、該取付棒４に取付けられる変換プーリ５ａ、５ｂ、５ｃ、５ｄと、取付棒４の両端部に平行をなして下向きに取付けられる支持棒６と、各支持棒６の下端にそれぞれ取付けられる変換プーリ７よりなり、各プーリ３、５ａ、５ｂ、５ｃ、５ｄ及び７にエンドレスなダイヤモンドワイヤー（以下、単にワイヤーという）１１が所定の順序で掛けられている。 FIG. 1 shows a cutting device similar to the device disclosed in Patent Document 1 below, and this device is illustrated by being vertically attached to a support column 2 vertically installed on a deck 1 and attached to the support column 2 so as to be able to move up and down. A drive pulley 3 that moves up and down by an elevating mechanism consisting of a pinion rack mechanism and is rotationally driven by a rotary drive mechanism including a motor, a mounting rod 4 that is laid horizontally under the support column, and a conversion pulley that is mounted on the mounting rod 4. It consists of 5a, 5b, 5c, 5d, a support rod 6 that is mounted parallel to both ends of the mounting rod 4 and is mounted downward, and a conversion pulley 7 that is mounted at the lower end of each support rod 6, and each pulley 3, 5a. Endless diamond wires (hereinafter, simply referred to as wires) 11 are hung on 5b, 5c, 5d and 7 in a predetermined order.

上記装置を用いた工法においては先ず、下向きに膨出する凸部１ａが鋼桁９上に図示しないアンカーボルトによって固定される床版１に対し、一対の縦孔８を前記凸部１ａの鋼桁９を挟んだ箇所に貫通して形成すると共に、縦孔８との間で前記凸部１ａを挟む近傍箇所に鋼桁９と直交するワイヤーを通す水平な通孔１２（以下、ワイヤー通孔という）または切断溝を下向きに膨出する凸部１aに形成し、前記各縦孔８に下端に変換プーリ７を備えた支持棒６を挿入し配置する。 In the construction method using the above device, first, a pair of vertical holes 8 are formed in the steel of the convex portion 1a with respect to the deck 1 in which the convex portion 1a protruding downward is fixed on the steel girder 9 by an anchor bolt (not shown). A horizontal through hole 12 (hereinafter referred to as a wire through hole) formed by penetrating the portion sandwiching the girder 9 and passing a wire orthogonal to the steel girder 9 in a vicinity portion sandwiching the convex portion 1a with the vertical hole 8 (hereinafter, wire through hole). A cutting groove is formed in the convex portion 1a that bulges downward, and a support rod 6 having a conversion pulley 7 at the lower end is inserted into each of the vertical holes 8 and arranged.

そして駆動プーリ３に掛けられるワイヤー１１を変換プーリ５ａ、５ｂ、５ｃ、５ｄ及び前記縦孔８内の変換プーリ７に掛け、変換プーリ７間のワイヤー１１を鋼桁９上の凸部１ａに開けられた前記ワイヤー通孔１２に通して、床版凸部１ａを囲うようにして水平に掛け渡す。次に前記ワイヤー１１を無端状に連結した状態で駆動プーリ３の回転により走行駆動させると共に、前記昇降機構により駆動プーリ３を図の矢印方向に上昇させてワイヤー１１を牽引し、床版凸部１ａを図示しない前記アンカーボルトと共に水平切断し鋼桁９より分離するようにしている。 Then, the wire 11 hung on the drive pulley 3 is hung on the conversion pulleys 5a, 5b, 5c, 5d and the conversion pulley 7 in the vertical hole 8, and the wire 11 between the conversion pulleys 7 is opened in the convex portion 1a on the steel girder 9. It is passed through the wire through hole 12 and horizontally hung so as to surround the floor slab convex portion 1a. Next, the wire 11 is driven to travel by rotation of the drive pulley 3 in a state where the wire 11 is connected endlessly, and the drive pulley 3 is raised in the direction of the arrow in the figure by the elevating mechanism to pull the wire 11 and the floor slab convex portion. 1a is horizontally cut together with the anchor bolt (not shown) so as to be separated from the steel girder 9.

なお上記工法において、図示する変換プーリ７が縦孔８内に納められているのは、変換プーリ７より下向きに方向転換するワイヤー１１を水平切断位置に位置させる必要があるためである。 In the above construction method, the illustrated conversion pulley 7 is housed in the vertical hole 8 because it is necessary to position the wire 11 that changes direction downward from the conversion pulley 7 at the horizontal cutting position.

別の工法として、下記非特許文献１には、ワイヤーソーよりなる切断装置全体を床版下の鋼桁に取付け、鋼桁上の床版を水平切断する装置が提案されている。 As another construction method, Non-Patent Document 1 below proposes a device in which the entire cutting device made of a wire saw is attached to a steel girder under the floor slab and the floor slab on the steel girder is horizontally cut.

特開２００９−１１４６８８号公報Japanese Unexamined Patent Publication No. 2009-114688

２０１９年８月９日発行の日本経済新聞Nihon Keizai Shimbun published on August 9, 2019

特許文献１に開示される工法では、切断装置は床版上に設置されるが、床版下の鋼桁に取付けられる非特許文献１に開示される装置と比べ、重量のある切断装置の床版への取付作業が容易である利点があるが、縦孔内に配置される変換プーリ７に掛けられるワイヤー１１は切断時、鋼桁９と干渉しない、鋼桁上の所望の水平切断位置に位置させる必要があることから、ワイヤー１１による切断位置を設定するために変換プーリ７の上下位置を調整する必要が生ずる。 In the construction method disclosed in Patent Document 1, the cutting device is installed on the deck, but the floor of the cutting device is heavier than the device disclosed in Non-Patent Document 1 attached to the steel girder under the deck. Although it has the advantage of being easy to attach to the plate, the wire 11 hung on the conversion pulley 7 arranged in the vertical hole does not interfere with the steel girder 9 at the time of cutting, and is at a desired horizontal cutting position on the steel girder. Since it is necessary to position the conversion pulley 7, it is necessary to adjust the vertical position of the conversion pulley 7 in order to set the cutting position by the wire 11.

変換プーリ７の上下位置の調整は、変換プーリ７を支持棒６と共に上げ下げすることにより行われ、上下位置調整後、支持棒６を固定するが、上下位置調整時には変換プーリ下端が所要の上下位置となるように、すなわち水平切断位置となるように床版下で変換プーリ７の上げ下げを行う作業員と、床版上で変換プーリ７が取付けられる支持棒６の固定作業を行う作業員が必要となる。 The vertical position of the conversion pulley 7 is adjusted by raising and lowering the conversion pulley 7 together with the support rod 6, and after adjusting the vertical position, the support rod 6 is fixed. It is necessary to have a worker who raises and lowers the conversion pulley 7 under the deck so that the conversion pulley 7 is in the horizontal cutting position, and a worker who fixes the support rod 6 on which the conversion pulley 7 is mounted on the deck. It becomes.

支持棒を固定し、床版下で固定の支持棒６に対し、変換プーリ７を上げ下げして上下位置を調整することができれば、１人の作業員で調整作業を行うことができるが、スペースの限られた狭い縦孔８内で変換プーリの調整作業を行うのは容易でない。 If the support rod is fixed and the conversion pulley 7 can be raised and lowered to adjust the vertical position with respect to the support rod 6 fixed under the floor slab, one worker can perform the adjustment work, but space is required. It is not easy to adjust the conversion pulley in the limited narrow vertical hole 8.

ワイヤーはまた、駆動プーリへの送り側と駆動プーリから送り出される側とでは、前者が張り側、後者が緩み側となり、緩み側は張り側に比べ張力が小さいうえ、変換プーリの回転による遠心力によってワイヤーが垂れ下がりがちで、多少でも垂れ下がりがあると、床版に切り込まれるワイヤーが次第に床版を支持するＨ型鋼よりなる鋼桁９に達し、該鋼桁を傷付けるおそれがある。 The wire also has a tension side on the tension side and a loosening side on the latter side on the side sent to the drive pulley and the side sent out from the drive pulley, and the tension on the loosening side is smaller than that on the tension side, and the centrifugal force due to the rotation of the conversion pulley. If the wire hangs down even a little, the wire cut into the deck gradually reaches the steel girder 9 made of H-shaped steel that supports the deck, and there is a risk of damaging the steel girder.

そこで床版凸部を水平切断する際には、ワイヤーが鋼桁９と接触することがないように鋼桁９より離れた箇所を切断せざるを得なくなるが、ワイヤーが鋼桁９より離れるほど、床版切断後に鋼桁９上に残るコンクリートが多くなり、多くなるほど切断終了後、該コンクリートをハツって除去するのに多くの手間が掛かるようになる。 Therefore, when horizontally cutting the convex portion of the deck, it is necessary to cut a portion away from the steel girder 9 so that the wire does not come into contact with the steel girder 9, but the more the wire is separated from the steel girder 9. The amount of concrete remaining on the steel girder 9 after cutting the deck increases, and as the amount increases, it takes a lot of time and effort to remove the concrete after cutting.

本発明は、橋梁のコンクリート床版上に取付けられるワイヤーソーよりなる切断装置において、支持棒に取付けられる水平切断位置決め用の変換プーリの上下位置の調整作業が床版下において、１人の作業員で容易に行え、しかも水平切断が鋼桁に近い箇所で行えて切断終了後の鋼桁上に残るコンクリートのハツリ作業を軽減させることができる床版凸部の切断装置及び方法を提供することを目的とする。 According to the present invention, in a cutting device consisting of a wire saw mounted on a concrete deck of a bridge, one worker adjusts the vertical position of a conversion pulley for horizontal cutting positioning mounted on a support rod under the deck. To provide a deck cutting device and method that can be easily performed with a steel girder and can reduce the chipping work of concrete remaining on the steel girder after cutting by performing horizontal cutting near the steel girder. The purpose.

請求項１に係る発明は、橋梁のコンクリート製床版上に縦設される支柱と、該支柱に昇降可能に取付けられる駆動プーリと、該駆動プーリを回転駆動する駆動装置と、前記駆動プーリを支柱に沿って昇降させる昇降機構と、床版上に配置される変換プーリと、下面より膨らむ凸部において鋼桁に支持される床版に対し、鋼桁両側の凸部にあけられた一対の縦孔にそれぞれ配置される支持棒と、床版より下向きに突出する支持棒に上下位置が調整可能に取付けられるプーリ装置と、床版上の前記駆動プーリ及び変換プーリと、床版下のプーリ装置とに掛けられる無端状のワイヤーを有し、前記各プーリ装置は複数の変換プーリよりなり、そのうちの最上位の変換プーリに掛けられるワイヤーが水平切断位置に位置することを特徴とする。 The invention according to claim 1 comprises a column vertically installed on a concrete deck of a bridge, a drive pulley that is vertically attached to the column, a drive device that rotationally drives the drive pulley, and the drive pulley. A pair of elevating mechanisms that move up and down along the columns, a conversion pulley placed on the floor slab, and a pair of convex parts on both sides of the steel girder with respect to the floor slab that is supported by the steel girder at the convex parts that bulge from the lower surface. A support rod arranged in each of the vertical holes, a pulley device whose vertical position is adjustablely attached to a support rod protruding downward from the deck, the drive pulley and conversion pulley on the deck, and a pulley under the deck. Each pulley device comprises a plurality of conversion pulleys, and the wire hung on the highest conversion pulley is located at a horizontal cutting position.

請求項２に係る発明は、請求項１に係る発明において、前記プーリ装置は上下の変換プーリよりなり、縦孔に通されたワイヤーがプーリ装置の下側の変換プーリより上側の変換プーリに掛けられことを特徴とする。 The invention according to claim 2 is the invention according to claim 1, wherein the pulley device is composed of upper and lower conversion pulleys, and a wire passed through a vertical hole is hooked on a conversion pulley above the conversion pulley on the lower side of the pulley device. It is characterized by being a wire.

請求項３に係る発明は、請求項１又は２に係る発明において、凸部の一側部に前記縦孔が、他側部に溝底が水平切断位置に位置する縦溝又は水平切断位置に位置するワイヤー通孔が形成され、鋼桁を挟む凸部両側の傾斜した側面のうち、少なくとも前記縦溝又はワイヤー通孔へのワイヤー導入側の側面に開口する溝端又はワイヤー通孔端には、ワイヤーの受ガイドが設けられることを特徴とする。 The invention according to claim 3 is the invention according to claim 1 or 2, in which the vertical hole is located on one side of the convex portion and the groove bottom is located on the other side in the vertical groove or the horizontal cutting position. Of the inclined side surfaces on both sides of the convex portion that sandwiches the steel girder, at least the groove end or the wire through hole end that opens on the side surface on the side where the wire is introduced into the vertical groove or the wire through hole is formed. It is characterized in that a wire receiving guide is provided.

請求項４に係る発明は、請求項１に係る発明の切断装置を用いた床版凸部の切断方法であって、前記床版にワイヤーを通す縦孔をあける作業、床版上に支柱を取付ける作業、変換プーリを備えた取付棒を前記支柱に横架する作業、床版にあけられた縦孔に支持棒を通す作業、前記縦孔より突出する支持棒にプーリ装置を上下位置調整後、取付けられる作業、床版上の駆動プーリ及び変換プーリと、床版下に突出する支持棒に取付けのプーリ装置にワイヤーを掛ける作業の各作業を行ったのち、前記駆動プーリを駆動装置により回転駆動すると共に、昇降機構により上方に移動させてワイヤーを走行駆動しながら牽引し、前記床版凸部を水平切断することを特徴とする。 The invention according to claim 4 is a method for cutting a convex portion of a floor slab using the cutting device of the invention according to claim 1, wherein a vertical hole for passing a wire is formed in the floor slab, and a support is provided on the floor slab. After adjusting the vertical position of the pulley device to the support rod protruding from the vertical hole, the work of mounting, the work of laying the mounting rod with the conversion pulley horizontally on the support column, the work of passing the support rod through the vertical hole drilled in the deck. After performing each of the work of attaching, the work of hanging the wire on the drive pulley and conversion pulley on the deck, and the work of hanging the wire on the pulley device attached to the support rod protruding under the deck, the drive pulley is rotated by the drive device. It is characterized in that it is driven and moved upward by an elevating mechanism to pull the wire while traveling and driving, and horizontally cuts the convex portion of the deck.

請求項１に係る発明によると、切断装置の床版への取付作業は、床版より下向きに突出する支持棒へのプーリ装置の取付作業を除き、床版上で行われるため、特許文献１記載の装置に比べ、作業性に大した違いをもたらさず、特許文献１記載の装置と同様、床版への切断装置全体の取付作業が容易に行えるほか、プーリ装置の支持棒への取付けは、一人の作業員が床版下で床版より下向に突出する支持棒に対して上下位置を目視で確認しながら行うことができ、プーリ装置の支持棒への取付位置の調整が容易に低コストで行えるようになる。またプーリ装置のうち、ワイヤー送り出し側の緩み側のプーリ装置における最上位の変換プーリに掛かるワイヤーは、該プーリの回転による遠心力によって上方に飛ばされようとするため、図１に示す従来装置に比べ、床版を支持する鋼桁に接触し難くなり、そのためワイヤーによる切断位置を鋼桁に近付け易くなり、切断終了後の鋼桁上に残るコンクリート量を少なくでき、該コンクリートのハツリ作業を軽減できるようになる。 According to the invention of claim 1, the work of attaching the cutting device to the deck is performed on the deck except for the work of attaching the pulley device to the support rod protruding downward from the deck. Therefore, Patent Document 1 Compared to the described device, the workability is not significantly different, and as with the device described in Patent Document 1, the entire cutting device can be easily attached to the deck, and the pulley device can be attached to the support rod. , One worker can visually check the vertical position of the support rod protruding downward from the floor slab under the floor slab, and the mounting position of the pulley device on the support rod can be easily adjusted. It will be possible to do it at low cost. Further, among the pulley devices, the wire hanging on the highest conversion pulley in the pulley device on the loosening side on the wire feeding side tends to be blown upward by the centrifugal force due to the rotation of the pulley, so that the conventional device shown in FIG. 1 is used. In comparison, it becomes difficult to contact the steel girder that supports the deck, so the cutting position by the wire can be easily brought closer to the steel girder, the amount of concrete remaining on the steel girder after cutting can be reduced, and the chipping work of the concrete can be reduced. become able to.

請求項２に係る発明によると、支持棒に取付けられるプーリ装置の変換プーリは最小の２個でよく、上側の変換プーリに掛けられるワイヤーを水平切断位置に位置させることができる。 According to the invention of claim 2, the minimum number of conversion pulleys of the pulley device attached to the support rod is two, and the wire hung on the upper conversion pulley can be positioned at the horizontal cutting position.

請求項３に係る発明によると、床版凸部を取り囲むようにして掛けられるワイヤーを床版に形成される縦溝の溝底又はワイヤー通孔に拘束させた状態で水平切断位置が行われ、所定位置での水平切断を容易かつ確実に行うことができ、また凸部側面に開口する溝端又はワイヤー通孔端にはワイヤーを受ける受ガイドを設けることによってワイヤーの垂れ下がりを受け、ワイヤー垂れ下がりによる鋼桁の損傷をより一層防ぐことができる。 According to the invention of claim 3, the horizontal cutting position is performed in a state where the wire hung so as to surround the convex portion of the deck is constrained to the groove bottom of the vertical groove formed in the deck or the wire through hole. Horizontal cutting at a predetermined position can be easily and surely performed, and the wire is hung down by providing a receiving guide for receiving the wire at the groove end or the wire through-hole end that opens on the side surface of the convex portion. Damage to the girder can be further prevented.

請求項４に係る発明によると、請求項１に係る発明の切断装置を用いた床版凸部への水平切断が行える。 According to the invention of claim 4, horizontal cutting can be performed on the convex portion of the deck using the cutting device of the invention of claim 1.

従来法による床版切断装置の断面図。Sectional drawing of the floor slab cutting apparatus by the conventional method. 本実施形態に係る切断装置の断面図。Sectional drawing of the cutting apparatus which concerns on this embodiment. 支持棒に取付けられた床版下のプーリ装置の正面図。Front view of the pulley device under the floor slab attached to the support rod. 同プーリ装置の平面図。Top view of the pulley device. 床版凸部を水平切断するときの鋼桁付き床版の底面図。Bottom view of the deck with steel girders when horizontally cutting the convex part of the deck. 受ガイドを備えた図２に示すｃ部の拡大断面図。FIG. 2 is an enlarged cross-sectional view of part c shown in FIG. 2 provided with a receiving guide.

以下、本発明の実施形態に係る床版の切断装置について図面により説明する。
図２は、ワイヤーソーよりなる切断装置の概略を示すもので、既知のこの種切断装置と同様、床版１上に着脱可能に縦設される支柱２１と、該支柱２１に昇降可能に取付けられ、図示しない電動モータ又は油圧モータ等の駆動源を備えた駆動装置により回転駆動されると共に、モータを駆動源とする図示しないピニオンラック機構よりなる昇降機構により支柱２１に沿って昇降する駆動プーリ２２と、前記支柱下端部に横架される取付棒２３と、前記駆動プーリ２２の下方両側に位置して取付棒２３に左右位置が調節可能に取着される変換プーリ２４ａ、２４ｂと、前記取付棒２３の左右両側端部に位置して該取付棒２３にそれぞれ取外し可能に取着又は固着して縦設される、任意断面形状をなす棒、例えば角棒状の支持棒２５と、床版下の支持棒２５に上下位置が調整可能に取付けられるプーリ装置２７と、床版上の前記駆動プーリ２２、変換プーリ２４ａ、２４ｂ及び２６ａ、２６ｂと、床版下の前記プーリ装置２７に掛け渡される無端状のワイヤー２８よりなっている。 Hereinafter, the deck cutting device according to the embodiment of the present invention will be described with reference to the drawings.
FIG. 2 shows an outline of a cutting device made of a wire saw, and like the known cutting device of this type, a support column 21 detachably installed vertically on the deck 1 and a support column 21 attached to the support column 21 so as to be able to move up and down. A drive pulley that is rotationally driven by a drive device provided with a drive source such as an electric motor or a hydraulic motor (not shown) and that moves up and down along the support column 21 by an elevating mechanism including a pinion rack mechanism (not shown) that uses the motor as a drive source. The 22 and the mounting rods 23 laid horizontally on the lower end of the support column, and the conversion pulleys 24a and 24b located on both lower sides of the drive pulley 22 and having the left and right positions adjustablely attached to the mounting rods 23. A rod having an arbitrary cross-sectional shape, for example, a square rod-shaped support rod 25, which is located at both left and right ends of the mounting rod 23 and is detachably attached to or fixed to the mounting rod 23 and vertically installed, and a floor slab. It is hung on a pulley device 27 whose vertical position can be adjusted to be attached to a lower support rod 25, a drive pulley 22 on a deck, conversion pulleys 24a, 24b and 26a, 26b, and a pulley device 27 under a deck. It is made of an endless wire 28.

プーリ装置２７は図３に示すように、床版下に突出する前記支持棒２５に上下方向にスライド可能に取付けられ、上下位置調整後、上下の止めネジ２９によって止着される筒状の取付部３０と、該取付部３０に支持棒２５と平行に軸支される枢軸３１に軸支されるブラケット３２と、該ブラケット３２に軸着される複数、好ましくは上部及び下部に軸着される２個の変換プーリ３３ａ、３３ｂとよりなり、これら上下の変換プーリ３３ａ、３３ｂは図４に示すように、ブラケット３２と共に枢軸３１の回りを図４の左右に旋回可能（図示する例においては、旋回途上の１位置を示しているが、少なくとも９０度は旋回可能に構成される）で、後述の縦孔３７を通り、下側の変換プーリ３３ａに下側より掛けられたワイヤー２８は上側の変換プーリ３３ｂに掛けられ、該変換プーリ３３ｂより横向きに伸びるワイヤー２８の上下位置が切断位置に合致するようにプーリ装置２７全体の支持棒２５への上下位置が調整される。図１、図２及び図６の矢印は、ワイヤー２８の進行方向を示し、図１及び図２に示す例では、図の右側がワイヤー２８の緩み側、左側が張り側となっている。 As shown in FIG. 3, the pulley device 27 is slidably attached to the support rod 25 projecting under the floor slab in the vertical direction, and after adjusting the vertical position, is fixed by the upper and lower set screws 29 in a tubular shape. A portion 30, a bracket 32 pivotally supported by a pivot 31 pivotally supported by the mounting portion 30 in parallel with a support rod 25, and a plurality of brackets pivotally attached to the bracket 32, preferably upper and lower parts. It is composed of two conversion pulleys 33a and 33b, and these upper and lower conversion pulleys 33a and 33b can rotate around the pivot 31 together with the bracket 32 to the left and right of FIG. 4 (in the illustrated example, in the illustrated example). One position on the way of turning is shown, but it is configured to be able to turn at least 90 degrees), and the wire 28 hung from the lower side on the lower conversion pulley 33a through the vertical hole 37 described later is on the upper side. The vertical position of the entire pulley device 27 on the support rod 25 is adjusted so that the vertical position of the wire 28 that is hung on the conversion pulley 33b and extends laterally from the conversion pulley 33b matches the cutting position. The arrows in FIGS. 1, 2 and 6 indicate the traveling direction of the wire 28, and in the examples shown in FIGS. 1 and 2, the right side of the figure is the loosening side of the wire 28, and the left side is the tension side.

図２における、断面がＨ型鋼よりなる鋼桁９は図示省略した橋脚上に横架され、その上に前記床版１の下向きに膨らむ山形状の凸部１ａが図示しないアンカーボルトにより固定されている。 In FIG. 2, a steel girder 9 having a cross section made of H-shaped steel is laid horizontally on a pier (not shown), and a mountain-shaped convex portion 1a swelling downward of the deck 1 is fixed thereto by anchor bolts (not shown). There is.

床版１を鋼桁９より取外すときには、先ず図２に示すように、前記凸部１ａの一側面で、かつ鋼桁９両側の床版１に前記支持棒２５及びワイヤー２８を通す縦孔３７を一対、工具例えばコアドリルを用いて貫通して形成すると共に、前記凸部他側にワイヤー２８を通す水平なワイヤー通孔３８が鋼桁９と平行に、かつ水平切断位置に対応する箇所に形成される。図５には、ワイヤー通孔３８の両端が凸部１ａの斜面に開口した状態を示している。前記ワイヤー通孔３８の凸部斜面に形成される傾斜した開口にはそれぞれ、図６に示すように、断面板状又は湾曲したワイヤー２８の受ガイド４０を設け、ワイヤー２８が垂れ下がったときに該ワイヤー２８を受け、ワイヤー２８が鋼桁９に接触するのを防止するのが望ましい。 When removing the deck 1 from the steel girder 9, first, as shown in FIG. 2, a vertical hole 37 through which the support rod 25 and the wire 28 are passed through the deck 1 on one side surface of the convex portion 1a and on both sides of the steel girder 9. Is formed by penetrating a pair using a tool such as a core drill, and a horizontal wire through hole 38 through which the wire 28 is passed on the other side of the convex portion is formed in parallel with the steel girder 9 and at a position corresponding to the horizontal cutting position. Will be done. FIG. 5 shows a state in which both ends of the wire through hole 38 are opened on the slope of the convex portion 1a. As shown in FIG. 6, a receiving guide 40 for the wire 28 having a plate-shaped or curved cross section is provided in each of the inclined openings formed on the convex slope of the wire through hole 38, and when the wire 28 hangs down, the receiving guide 40 is provided. It is desirable to receive the wire 28 and prevent the wire 28 from coming into contact with the steel girder 9.

図示する例では、１つの縦孔３７に支持棒２５とワイヤー２８が一緒に通されているが、床版１に支持棒２５とワイヤー２８を通す孔を別個に独立して形成し、支持棒２５とワイヤー２８を個別に通すようにしてもよい。またワイヤー２８の上下位置を拘束するワイヤー通孔３８は床版１に下面より上方に向けて形成される縦溝に代えてもよい。この場合、縦溝は上端の溝底が水平切断位置に位置するように形成される。縦溝を形成する場合も、溝端にはワイヤー通孔３８と同様、受ガイド４０が設けられる。 In the illustrated example, the support rod 25 and the wire 28 are passed through one vertical hole 37 together, but the floor slab 1 is formed with holes for passing the support rod 25 and the wire 28 separately and independently, and the support rod is formed. The 25 and the wire 28 may be passed through individually. Further, the wire through hole 38 that restrains the vertical position of the wire 28 may be replaced with a vertical groove formed in the floor slab 1 so as to face upward from the lower surface. In this case, the vertical groove is formed so that the groove bottom at the upper end is located at the horizontal cutting position. When forming the vertical groove, a receiving guide 40 is provided at the groove end as in the wire through hole 38.

縦孔３７及びワイヤー通孔３８を形成後、次に図２に示すように、前記支柱２１を床版１に図示しないボルトにて止着する。変換プーリ２４ａ、２４ｂを備えた取付棒２３は支柱２１に予め横架して取付けておいてもよいし、前述するように床版１に支柱２１を取付けたのちに該支柱２１に取付けるようにしてもよい。 After forming the vertical hole 37 and the wire through hole 38, the support column 21 is fixed to the floor slab 1 with a bolt (not shown) as shown in FIG. The mounting rod 23 provided with the conversion pulleys 24a and 24b may be horizontally mounted on the support column 21 in advance, or as described above, the support column 21 may be attached to the floor slab 1 and then attached to the support column 21. You may.

ついで縦孔３７に支持棒２５が通され、取付棒２３に固定されるが、支持棒２５についても予め取付棒２３に取付けておいてもよい。取付棒２３に予め取付けておく場合、取付棒２３を支柱２１に取付ける際に支持棒２５が縦孔３７に挿入される。縦孔３７に挿入された支持棒２５の床版１より突出する部分には前記プーリ装置２７が上下位置を調整して取付けられる。 Then, the support rod 25 is passed through the vertical hole 37 and fixed to the mounting rod 23, but the support rod 25 may also be attached to the mounting rod 23 in advance. When the mounting rod 23 is attached to the mounting rod 23 in advance, the support rod 25 is inserted into the vertical hole 37 when the mounting rod 23 is attached to the support column 21. The pulley device 27 is attached to a portion of the support rod 25 inserted into the vertical hole 37 that protrudes from the floor slab 1 by adjusting the vertical position.

その後、ワイヤー２８が床版上の前記駆動プーリ２２から変換プーリ２４ａ、２４ｂ、２６ａ、２６ｂに掛けられ、縦孔３７に通されたのち、床版下側のプーリ装置２７の前記下側の変換プーリ３３ａ、ついで上側の変換プーリ３３ｂに掛けたのち、変換プーリ３３ｂ間のワイヤー２８を凸部１ａの山裾（傾斜面）に沿わせ、ワイヤ―横孔３８に通して凸部１ａを囲うようにしたのち、ワイヤー２８の自由端同士を連結し、無端状にする。駆動プーリ２２、変換プーリ２４ａ、２４ｂ、２６ａ、２６ｂ及び変換プーリ３３ａ、３３ｂへのワイヤー２８の通し順は前記順序に限定されず、図２に示すように形成して各プーリに掛けられていればよい。また、ワイヤー２８を無端状に連結する箇所はワイヤー通孔３８を通したのちであればどこでもよく、例えば床版上のいずれの箇所で連結してもよい。 After that, the wire 28 is hung from the drive pulley 22 on the deck to the conversion pulleys 24a, 24b, 26a, 26b, passed through the vertical hole 37, and then the conversion of the lower side of the pulley device 27 on the lower side of the deck. After hanging on the pulley 33a and then on the upper conversion pulley 33b, the wire 28 between the conversion pulleys 33b is placed along the mountain hem (inclined surface) of the convex portion 1a and passed through the wire-lateral hole 38 to surround the convex portion 1a. After that, the free ends of the wires 28 are connected to each other to form an endless shape. The order in which the wires 28 are passed through the drive pulley 22, the conversion pulleys 24a, 24b, 26a, 26b and the conversion pulleys 33a, 33b is not limited to the above order, and may be formed as shown in FIG. 2 and hung on each pulley. Just do it. Further, the place where the wire 28 is connected endlessly may be any place after passing through the wire through hole 38, and may be connected at any place on the deck, for example.

前記床版１に縦孔を形成する作業、ワイヤー通孔を形成する作業、床版上への支柱取付作業、取付棒２３の取付作業、支持棒２５の取付作業、支持棒２５への上下位置調整を含むプーリ装置２７の取付作業、ワイヤー２８の取付作業等は、前記作業順に限定されず、作業順は前記と異なっていても、要は切断装置が図２に示すような取付形態になっていればよい。 Work to form a vertical hole in the floor slab 1, work to form a wire through hole, work to attach a support column on the floor slab, work to attach a mounting rod 23, work to attach a support rod 25, and a vertical position on the support rod 25. The mounting work of the pulley device 27 including adjustment, the mounting work of the wire 28, and the like are not limited to the work order, and even if the work order is different from the above, the cutting device has a mounting form as shown in FIG. I just need to be there.

以上のようにして、床版１にワイヤーソー装置が取付けられ、ワイヤー２８が各プーリに掛けられたのち、駆動プーリ２２が前記駆動装置により回転駆動されると共に、昇降機構により図２の矢印方向に上昇し、これによりワイヤー２８が循環走行して牽引されながら鋼桁９上の床版凸部１ａに水平切断が行われ、この水平切断時に床版１と鋼桁９を連結する図示しないアンカーボルトの切断も行われる。 As described above, after the wire saw device is attached to the floor slab 1 and the wire 28 is hung on each pulley, the drive pulley 22 is rotationally driven by the drive device and is driven by the elevating mechanism in the direction of the arrow in FIG. Anchor (not shown) that connects the deck 1 and the steel girder 9 at the time of horizontal cutting is performed on the deck convex portion 1a on the steel girder 9 while the wire 28 is circulated and pulled by the wire 28. Bolt cutting is also done.

水平切断時、ワイヤー２８は切断が進行するのに伴い床版凸部１ａとの係合が図５に示すように山形となり、切断が進行するほど山裾の勾配が次第に低下する。そして変換プーリ３３ａ及び３３ｂもワイヤー２８の勾配に合せて、前記枢軸３１の回りを徐々に旋回し、向きを変えていく。切断終了時には、変換プーリ３３ａ及び３３ｂは内向きに９０度旋回し、ワイヤー２８も直線状になる。変換プーリ３３ａ及び３３ｂがワイヤー２８の傾きに合せて旋回することにより、ワイヤー２８が変換プーリ３３ａ、３３ｂより外れることなく循環走行する。 At the time of horizontal cutting, the wire 28 engages with the floor slab convex portion 1a in a chevron shape as the cutting progresses, and the slope of the mountain hem gradually decreases as the cutting progresses. Then, the conversion pulleys 33a and 33b also gradually turn around the pivot 31 in accordance with the gradient of the wire 28 and change their directions. At the end of cutting, the conversion pulleys 33a and 33b turn 90 degrees inward, and the wire 28 also becomes straight. By turning the conversion pulleys 33a and 33b according to the inclination of the wire 28, the wire 28 circulates without being separated from the conversion pulleys 33a and 33b.

床版１の凸部１ａが上述するようにして鋼桁上で水平切断される。そして床版１の各凸部１ａが鋼桁９と切り離されたのち、床版１がクレーンの操作により持上げられ鋼桁９より取外される。床版除去後、鋼桁９上に残る床版１の残部が削岩機等を用いて取り除かれる。 The convex portion 1a of the deck 1 is horizontally cut on the steel girder as described above. Then, after each convex portion 1a of the deck 1 is separated from the steel girder 9, the deck 1 is lifted by the operation of the crane and removed from the steel girder 9. After removing the deck, the rest of the deck 1 remaining on the steel girder 9 is removed using a rock drill or the like.

１・・床版
９・・鋼桁
２１・・支柱
２２・・駆動プーリ
２３・・取付棒
２４ａ、２４ｂ、２６ａ、２６ｂ、３３ａ、３３ｂ・・変換プーリ
２５・・支持棒
２７・・プーリ装置
２８・・ワイヤー
３１・・枢軸
３７・・縦孔
３８・・ワイヤー通孔
４０・・受ガイド 1 ... Floor slab 9 ... Steel girder 21 ... Strut 22 ... Drive pulley 23 ... Mounting rods 24a, 24b, 26a, 26b, 33a, 33b ... Conversion pulley 25 ... Support rod 27 ... Pulley device 28・ ・ Wire 31 ・ ・ Axis 37 ・ ・ Vertical hole 38 ・ ・ Wire through hole 40 ・ ・ Receiving guide

Claims (4)

橋梁のコンクリート製床版上に縦設される支柱と、該支柱に昇降可能に取付けられる駆動プーリと、該駆動プーリを回転駆動する駆動装置と、前記駆動プーリを支柱に沿って昇降させる昇降機構と、床版上に配置される変換プーリと、下面より膨らむ凸部において鋼桁に支持される床版に対し、鋼桁両側の凸部にあけられた一対の縦孔にそれぞれ配置される支持棒と、床版より下向きに突出する支持棒に上下位置が調整可能に取付けられるプーリ装置と、床版上の前記駆動プーリ及び変換プーリと、床版下のプーリ装置とに掛けられる無端状のワイヤーを有し、前記各プーリ装置は複数の変換プーリよりなり、そのうちの最上位の変換プーリ間に掛けられるワイヤーが水平切断位置に位置することを特徴とする橋梁床版の切断装置。 A column installed vertically on the concrete deck of the bridge, a drive pulley that is vertically attached to the column, a drive device that rotationally drives the drive pulley, and an elevating mechanism that raises and lowers the drive pulley along the column. The conversion pulley arranged on the deck and the deck supported by the steel girder at the convex portion bulging from the lower surface are supported by a pair of vertical holes formed in the convex portions on both sides of the steel girder. An endless shape that is hung on a rod, a pulley device whose vertical position can be adjustedly attached to a support rod protruding downward from the deck, the drive pulley and conversion pulley on the deck, and a pulley device under the deck. A bridge deck cutting device having wires, each of which is composed of a plurality of conversion pulleys, wherein the wire hung between the highest conversion pulleys is located at a horizontal cutting position. 前記プーリ装置は上下の変換プーリよりなり、縦孔に通されたワイヤーがプーリ装置の下側の変換プーリより上側の変換プーリに掛けられことを特徴とする請求項１記載の橋梁床版の切断装置。 The bridge deck slab according to claim 1, wherein the pulley device is composed of upper and lower conversion pulleys, and a wire passed through a vertical hole is hung on a conversion pulley above the conversion pulley on the lower side of the pulley device. apparatus. 凸部の一側部に前記縦孔が、他側部に溝底が水平切断位置に位置する縦溝又は水平切断位置に位置するワイヤー通孔が形成され、鋼桁を挟む凸部両側の傾斜した側面のうち、少なくとも前記縦溝又はワイヤー通孔へのワイヤー導入側の側面に開口する溝端又はワイヤー通孔端には、ワイヤーの受ガイドが設けられることを特徴とする請求項１又は２記載の橋梁床版の切断装置。 The vertical hole is formed on one side of the convex portion, and a vertical groove or a wire through hole whose groove bottom is located at the horizontal cutting position is formed on the other side, and the inclination of both sides of the convex portion sandwiching the steel girder is formed. The first or second aspect of claim 1 or 2, wherein a wire receiving guide is provided at least at the groove end or the wire through hole end that opens on the side surface on the wire introduction side into the vertical groove or the wire through hole. Bridge deck cutting device. 前記床版にワイヤーを通す縦孔をあける作業、床版上に支柱を取付ける作業、変換プーリを備えた取付棒を前記支柱に横架する作業、床版にあけられた縦孔に支持棒を通す作業、前記縦孔より突出する支持棒にプーリ装置を上下位置調整後、取付けられる作業、床版上の駆動プーリ及び変換プーリと、床版下に突出する支持棒に取付けのプーリ装置にワイヤーを掛ける作業の各作業を行ったのち、前記駆動プーリを駆動装置により回転駆動すると共に、昇降機構により上方に移動させてワイヤーを走行駆動しながら牽引し、前記床版凸部を水平切断することを特徴とする請求項１に係る発明の切断装置を用いた床版凸部の切断方法。 Work to make a vertical hole for passing a wire through the deck, work to install a support on the floor slab, work to lay a mounting rod with a conversion pulley horizontally on the support, work to lay a support rod in the vertical hole made in the floor slab. Work to pass, work to attach the pulley device after adjusting the vertical position to the support rod protruding from the vertical hole, work to attach the drive pulley and conversion pulley on the deck, and wire to the pulley device attached to the support rod protruding below the deck After performing each work of hanging, the drive pulley is rotationally driven by a drive device, and the drive pulley is moved upward by an elevating mechanism to pull the wire while traveling, and the convex portion of the deck is horizontally cut. A method for cutting a convex portion of a deck using the cutting device of the invention according to claim 1.
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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0470309A (en) * 1990-06-29 1992-03-05 Nippon Steel Corp Cutting method for concrete and guiding device for wire saw
JPH05192920A (en) * 1992-01-16 1993-08-03 Daimoshiya:Kk Method and apparatus for cutting structure into circular shape
US5645040A (en) * 1994-04-13 1997-07-08 Hydrostress Ag Cable saw machine for cutting concrete bodies, rocks or the like
JP2006161391A (en) * 2004-12-07 2006-06-22 Create Nakagawa:Kk Cutting and removing apparatus for existing expansion joint, and method of using the same
JP2006299753A (en) * 2005-04-25 2006-11-02 Nippon Steel Engineering Co Ltd Partial cutting device for existing expansion joint part and partial cutting method
JP2009114688A (en) * 2007-11-05 2009-05-28 Sho Bond Constr Co Ltd Method of cutting bridge floor slab
JP2018087418A (en) * 2016-11-28 2018-06-07 宮地エンジニアリング株式会社 Demolition system and demolition method of concrete slab
JP2018145668A (en) * 2017-03-03 2018-09-20 Ｊｆｅエンジニアリング株式会社 Apparatus for cutting existing concrete floor slab

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0470309A (en) * 1990-06-29 1992-03-05 Nippon Steel Corp Cutting method for concrete and guiding device for wire saw
JPH05192920A (en) * 1992-01-16 1993-08-03 Daimoshiya:Kk Method and apparatus for cutting structure into circular shape
US5645040A (en) * 1994-04-13 1997-07-08 Hydrostress Ag Cable saw machine for cutting concrete bodies, rocks or the like
JP2006161391A (en) * 2004-12-07 2006-06-22 Create Nakagawa:Kk Cutting and removing apparatus for existing expansion joint, and method of using the same
JP2006299753A (en) * 2005-04-25 2006-11-02 Nippon Steel Engineering Co Ltd Partial cutting device for existing expansion joint part and partial cutting method
JP2009114688A (en) * 2007-11-05 2009-05-28 Sho Bond Constr Co Ltd Method of cutting bridge floor slab
JP2018087418A (en) * 2016-11-28 2018-06-07 宮地エンジニアリング株式会社 Demolition system and demolition method of concrete slab
JP2018145668A (en) * 2017-03-03 2018-09-20 Ｊｆｅエンジニアリング株式会社 Apparatus for cutting existing concrete floor slab

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