JP2021004104A - Jib crane - Google Patents

Jib crane Download PDF

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JP2021004104A
JP2021004104A JP2019117245A JP2019117245A JP2021004104A JP 2021004104 A JP2021004104 A JP 2021004104A JP 2019117245 A JP2019117245 A JP 2019117245A JP 2019117245 A JP2019117245 A JP 2019117245A JP 2021004104 A JP2021004104 A JP 2021004104A
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jib
main
winding
wire rope
flying
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JP7365794B2 (en
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宏明 田畑
Hiroaki Tabata
宏明 田畑
宗典 堀内
Sosuke Horiuchi
宗典 堀内
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IHI Transport Machinery Co Ltd
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IHI Transport Machinery Co Ltd
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Abstract

To provide a jib crane having a flying jib installed at a tip of a main jib without reducing maintenance performance and greatly increasing cost.SOLUTION: A jib crane 1 having a flying jib 10 installed at a tip of a main jib 9 attached to a turntable 8 so as to undulate and capable of performing loading operation by using a hoisting wire rope 16 drawn down from the tip of the main jib 9 as a main rope and a hoisting wire rope 17 drawn down from the tip of the flying jib 10 as an auxiliary rope comprises two hoists 18, 19 which wind and deliver the hoisting wire ropes 16, 17 respectively serving as the main rope and the auxiliary rope, and is configured such that the entire jib (main jib 9 and flying jib 10) can be pulled in by further winding up the other of the hoisting wire ropes 16, 17 from maximum winding-up during loading work which uses one of the hoisting wire ropes 16, 17 serving as the main rope and the auxiliary rope.SELECTED DRAWING: Figure 1

Description

本発明は、フライングジブを主ジブの先端に備えたジブクレーンに関するものである。 The present invention relates to a jib crane having a flying jib at the tip of a main jib.

ジブクレーンの中には造船所に備えられて重量物の運搬に使用されるものがあり、このようなジブクレーンは、その上部に設けられた旋回台と、該旋回台から張り出されたジブとを備えている。前記ジブは、その基端が前記旋回台に枢支されて起伏ワイヤロープの引き込み又は引き出しにより起伏し得るようになっており、前記ジブの先端からは、巻上ワイヤロープを介してフック等の吊具が吊持され、この吊具に吊荷を掛けて巻上ワイヤロープの巻き取り及び繰り出しを行うことで、前記吊荷の吊り上げ・吊り降ろしの作業(荷役作業)が行われるようになっている。 Some jib cranes are installed in shipyards and used to carry heavy objects, and such jib cranes have a swivel provided on top of the jib crane and a jib overhanging the swivel. I have. The base end of the jib is pivotally supported by the swivel base so that the jib can be undulated by pulling in or pulling out the undulating wire rope, and from the tip of the jib, a hook or the like is provided via a hoisting wire rope. The hanging tool is suspended, and by hanging the hanging load on the hanging tool and winding and unwinding the hoisting wire rope, the work of lifting and lowering the suspended load (cargo handling work) can be performed. ing.

ここで、前記造船所において、ゴライアスクレーンと称される巨大なトロリー式橋形クレーンが装備されており、このゴライアスクレーンの橋形の内側に前記ジブクレーンが配備され且つ前記ゴライアスクレーンの走行方向に沿い敷設されたレール上を走行するようにした軌道走行式のジブクレーンとなっている場合、該ジブクレーンのアウトリーチを長くしたいという要望があっても、単純にジブを長くしただけでは、該ジブを引込動作のために起こした際に前記ゴライアスクレーンとの干渉が生じる虞れがある。 Here, at the shipyard, a huge trolley type bridge crane called a Goliath crane is equipped, and the jib crane is deployed inside the bridge shape of the Goliath crane and along the traveling direction of the Goliath crane. In the case of a track-traveling jib crane that travels on laid rails, even if there is a request to lengthen the outreach of the jib crane, simply lengthening the jib will pull the jib in. When raised for operation, there is a risk of interference with the Goliath crane.

そこで、本発明者らは、従来のジブクレーンにおけるジブを主ジブとし、その先端にフライングジブを傾動自在に備え、主ジブが起伏してもフライングジブが水平状態に保たれるようにして高さを抑え、アウトリーチを稼ぎながらもゴライアスクレーンとの干渉を回避し得るようにすることを創案するに到った。 Therefore, the present inventors have a jib in a conventional jib crane as a main jib, and a flying jib is provided at the tip thereof so as to be tiltable so that the flying jib is kept horizontal even if the main jib undulates. I came up with the idea of being able to avoid interference with the Goliath Crane while gaining outreach.

尚、一般的なジブクレーンに関連する先行技術文献情報としては下記の特許文献1等がある。 The following patent document 1 and the like are available as prior art document information related to a general jib crane.

特開2011−37574号公報Japanese Unexamined Patent Publication No. 2011-37574

しかしながら、前述した如き主ジブの先端にフライングジブを装備したジブクレーンにあっては、主ジブの先端から吊り降ろした巻上ワイヤロープを主巻(巻き掛数を増やした重荷重用のもの)とし、フライングジブの先端から吊り降ろした巻上ワイヤロープを補巻(単索で荷を吊る補助用のもの)として、何れの先端からも荷役作業を行い得るようにすることになるため、主巻用と補巻用の巻上装置と、主ジブの引込動作のための引込装置とを備えなければならず、計三台の独立した駆動装置が必要となることでメンテナンス性の低下と大幅なコストアップを招くという課題があった。 However, in the case of a jib crane equipped with a flying jib at the tip of the main jib as described above, the hoisting wire rope suspended from the tip of the main jib is used as the main winding (for heavy loads with an increased number of windings). For the main winding, the hoisting wire rope suspended from the tip of the flying jib is used as a supplementary winding (for assisting in hanging the load with a single rope) so that cargo handling work can be performed from any tip. And a hoisting device for auxiliary winding and a pulling device for pulling in the main jib must be provided, and a total of three independent drive devices are required, resulting in reduced maintainability and significant cost. There was a problem of inviting up.

本発明は上述の実情に鑑みてなしたもので、メンテナンス性の低下と大幅なコストアップを招くことなくフライングジブを主ジブの先端に装備したジブクレーンを実現することを目的とする。 The present invention has been made in view of the above circumstances, and an object of the present invention is to realize a jib crane equipped with a flying jib at the tip of a main jib without causing a decrease in maintainability and a significant increase in cost.

本発明は、旋回台に起伏自在に取り付けた主ジブの先端にフライングジブを備え、前記主ジブの先端から吊り降ろした巻上ワイヤロープを主巻とし且つ前記フライングジブの先端から吊り降ろした巻上ワイヤロープを補巻として荷役作業を行い得るようにしたジブクレーンであって、主巻と補巻の巻上ワイヤロープの巻き取り及び繰り出しを行う二台の巻上装置を備え、主巻と補巻の何れか一方の巻上ワイヤロープを使用した荷役作業時に他方の巻上ワイヤロープを最大限巻き上げたところから更に巻き上げることでジブ全体を引込操作し得るよう構成したことを特徴とするものである。 In the present invention, a flying jib is provided at the tip of a main jib undulatingly attached to a swivel base, and a winding wire rope suspended from the tip of the main jib is used as the main winding and a winding suspended from the tip of the flying jib. It is a jib crane that can perform cargo handling work using the upper wire rope as a supplementary winding, and is equipped with two hoisting devices for winding and unwinding the main winding and the auxiliary winding winding wire rope, and the main winding and the auxiliary winding. It is characterized by being configured so that the entire jib can be retracted by further winding the other winding wire rope from the place where the other winding wire rope is wound to the maximum during cargo handling work using one of the winding wire ropes. is there.

また、本発明においては、主巻と補巻の各巻上ワイヤロープを最大限巻き上げたところで主ジブ及びフライングジブの先端近傍に到るよう前記各巻上ワイヤロープ側に装備したストライカと、前記主ジブ及びフライングジブの先端に設けられて前記ストライカを受けるストッパとを備えることが好ましい。 Further, in the present invention, the striker equipped on the winding wire rope side so as to reach the vicinity of the tips of the main jib and the flying jib when the winding wire ropes of the main winding and the auxiliary winding are wound to the maximum, and the main jib. It is also preferable to provide a stopper provided at the tip of the flying jib to receive the striker.

上記した本発明のジブクレーンによれば、二台の巻上装置だけで荷役作業と引込操作を賄うことができて引込装置を別途設置する必要がなくなるので、メンテナンス性の大幅な向上と顕著なコストダウンを図ることができるという優れた効果を奏し得る。 According to the jib crane of the present invention described above, the cargo handling work and the pull-in operation can be covered by only two hoisting devices, and it is not necessary to separately install the pull-in device, so that the maintainability is greatly improved and the cost is remarkable. It can produce an excellent effect that it can be downed.

本発明を実施する形態の一例を示す概略構成図である。It is a schematic block diagram which shows an example of embodiment of this invention. 図1の補巻を使用して荷役作業を行う例を示す概略構成図である。It is a schematic block diagram which shows the example which performs the cargo handling work using the auxiliary winding of FIG. 図1におけるIII部の詳細を示す拡大図である。It is an enlarged view which shows the detail of the part III in FIG.

以下、本発明の実施の形態を図面を参照しつつ説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図1〜図3は本発明を実施する形態の一例を示すもので、ここに図示している例では、造船所等でゴライアスクレーンの橋形の内側に軌道走行式のジブクレーン1として利用する場合で例示しており、図1及び図2の紙面と直交する方向へレール2が敷設されており、該レール2に沿って転動自在な走行車輪3を備えた走行装置4が基台5の脚部6に取り付けられ、前記基台5上にはマスト7が立設されて該マスト7の上端に旋回台8が旋回自在に配設されている。この旋回台8には、主ジブ9が起伏自在に取り付けられていると共に、該主ジブ9の先端にフライングジブ10が傾動自在に備えられており、前記主ジブ9が起伏しても前記フライングジブ10を水平状態に保ち得るよう該フライングジブ10が支持ワイヤロープ11等により支持されている。ここでフライングジブ10は、支持ワイヤロープ11以外の他の部材により支持されても良く、支持の構成は特に制限されるものではない。 1 to 3 show an example of the embodiment of the present invention, and in the example shown here, when the jib crane 1 is used as a track traveling type jib crane inside the bridge shape of a Goliath crane at a shipyard or the like. In the example, the rail 2 is laid in the direction orthogonal to the paper surface of FIGS. 1 and 2, and the traveling device 4 provided with the traveling wheel 3 that can roll along the rail 2 is the base 5. It is attached to the leg portion 6, and a mast 7 is erected on the base 5, and a swivel base 8 is rotatably arranged at the upper end of the mast 7. A main jib 9 is undulatingly attached to the swivel base 8, and a flying jib 10 is provided at the tip of the main jib 9 so as to be tiltable. Even if the main jib 9 undulates, the flying The flying jib 10 is supported by a support wire rope 11 or the like so that the jib 10 can be kept horizontal. Here, the flying jib 10 may be supported by a member other than the support wire rope 11, and the support configuration is not particularly limited.

即ち、前記旋回台8の上面に、前支柱12と後支柱13とを有する上部フレーム14が立設され、前記フライングジブ10の基端には、前記前支柱12と同じ高さの中間支柱15が立設されていて、前記旋回台8の上面から繰り出された前記支持ワイヤロープ11が前記前支柱12上端と前記中間支柱15上端とを経由して前記フライングジブ10先端に連結されるようになっているので、前記主ジブ9の起伏にかかわらず前記支持ワイヤロープ11の繰り出し長が一定に保持され、前記フライングジブ10が水平状態に保たれるようになっている。 That is, an upper frame 14 having a front strut 12 and a rear strut 13 is erected on the upper surface of the swivel base 8, and an intermediate strut 15 having the same height as the front strut 12 is erected at the base end of the flying jib 10. Is erected, and the support wire rope 11 drawn out from the upper surface of the swivel 8 is connected to the tip of the flying jib 10 via the upper end of the front strut 12 and the upper end of the intermediate strut 15. Therefore, the feeding length of the support wire rope 11 is kept constant regardless of the undulations of the main jib 9, and the flying jib 10 is kept in a horizontal state.

斯かるジブクレーン1では、前記主ジブ9の先端から吊り降ろした巻上ワイヤロープ16を主巻とし且つ前記フライングジブ10の先端から吊り降ろした巻上ワイヤロープ17を補巻として荷役作業を行い得るようにしてあり、前記主巻の巻上ワイヤロープ16の巻き取り及び繰り出しを行う巻上装置18と、前記補巻の巻上ワイヤロープ17の巻き取り及び繰り出しを行う巻上装置19とが前記旋回台8の上面に搭載されている。 In such a jib crane 1, cargo handling work can be performed using the hoisting wire rope 16 suspended from the tip of the main jib 9 as the main winding and the hoisting wire rope 17 suspended from the tip of the flying jib 10 as the auxiliary winding. The hoisting device 18 for winding and unwinding the main winding wire rope 16 and the hoisting device 19 for winding and unwinding the auxiliary winding wire rope 17 are described above. It is mounted on the upper surface of the swivel table 8.

尚、前記主ジブ9を起伏させるための起伏ワイヤロープの配索や、該起伏ワイヤロープの巻き取り及び繰り出しを行う引込装置の設置は成されておらず、主巻と補巻の何れか一方の巻上ワイヤロープ16又は17を使用した荷役作業時に、他方の巻上ワイヤロープ17又は16を最大限巻き上げたところから更に巻き上げることでジブ全体(主ジブ9及びフライングジブ10)を引込操作し得るように構成してある。 It should be noted that the undulating wire rope for undulating the main jib 9 and the retracting device for winding and unwinding the undulating wire rope have not been installed, and either the main winding or the auxiliary winding has not been installed. During cargo handling work using the hoisting wire rope 16 or 17, the entire jib (main jib 9 and flying jib 10) is pulled in by further hoisting the other hoisting wire rope 17 or 16 from the place where it is wound up to the maximum. It is configured to get.

そして、図3にフライングジブ10の先端を例として示す通り、補巻の巻上ワイヤロープ17を最大限巻き上げたところでフライングジブ10の先端近傍に到るよう前記巻上ワイヤロープ17側にストライカ20が装備されており、前記フライングジブ10の先端には、最先端のシーブ21を回転自在に支持するブラケット22から延びて前記ストライカ20を受けるストッパ23が設けられている。 Then, as shown in FIG. 3 with the tip of the flying jib 10 as an example, the striker 20 is placed on the hoisting wire rope 17 side so as to reach the vicinity of the tip of the flying jib 10 when the hoisting wire rope 17 of the auxiliary winding is wound to the maximum. The flying jib 10 is equipped with a stopper 23 that extends from a bracket 22 that rotatably supports the state-of-the-art sheave 21 and receives the striker 20 at the tip of the flying jib 10.

また、ここではフライングジブ10の先端を例として説明しているが、主ジブ9の先端についても同様であり、主巻の巻上ワイヤロープ16を最大限巻き上げたところで主ジブ9の先端近傍に到るよう前記巻上ワイヤロープ16側にストライカが装備され、前記主ジブ9の先端には、前記巻上ワイヤロープ16側のストライカを受けるストッパが設けられるようになっている。 Further, although the tip of the flying jib 10 is described here as an example, the same applies to the tip of the main jib 9, and when the winding wire rope 16 of the main winding is wound up to the maximum, the tip of the main jib 9 is near the tip. A striker is provided on the hoisting wire rope 16 side so as to reach it, and a stopper for receiving the striker on the hoisting wire rope 16 side is provided at the tip of the main jib 9.

尚、図1及び図2中における符号の24は主巻の巻上ワイヤロープ16を介して吊持されたフック等の吊具、25は補巻の巻上ワイヤロープ17を介して吊持されたフック等の吊具、26は吊荷を示す。 In FIGS. 1 and 2, reference numeral 24 is a hanging tool such as a hook suspended via the winding wire rope 16 of the main winding, and 25 is suspended via the winding wire rope 17 of the auxiliary winding. A hanging tool such as a hook, 26 indicates a suspended load.

而して、このようにすれば、主巻と補巻の何れか一方の巻上ワイヤロープ16又は17を使用して荷役作業を行い、荷役作業に用いない他方の巻上ワイヤロープ17又は16を最大限巻き上げたところから更に巻き上げることでジブ全体の引込操作に使用することが可能となるので、二台の巻上装置18,19だけで荷役作業と引込操作を賄うことができて引込装置を別途設置する必要がなくなる。 Thus, in this way, the cargo handling work is performed using either the main winding or the auxiliary winding wire rope 16 or 17, and the other winding wire rope 17 or 16 not used for the cargo handling work. Since it is possible to use it for the pulling operation of the entire jib by winding it further from the place where it is wound up to the maximum, it is possible to cover the cargo handling work and the pulling operation with only two hoisting devices 18 and 19. There is no need to install it separately.

例えば、図1に示す如く、主巻の巻上ワイヤロープ16を使用し吊具24に吊荷26を掛けて荷役作業を行う場合に、荷役作業に用いない補巻の巻上ワイヤロープ17を最大限巻き上げたところから更に巻き上げると、ジブ全体が引き込まれて起き上がり、補巻の巻上ワイヤロープ17を繰り出すと、ジブ全体が前に倒れることになる。 For example, as shown in FIG. 1, when the main winding hoisting wire rope 16 is used and the hanging load 26 is hung on the hanger 24 to perform cargo handling work, the auxiliary winding hoisting wire rope 17 not used for the cargo handling work is used. When the jib is further wound from the maximum winding position, the entire jib is pulled in and rises, and when the auxiliary winding wire rope 17 is unwound, the entire jib falls forward.

他方、図2に示す如く、補巻の巻上ワイヤロープ17を使用し吊具25に吊荷26を掛けて荷役作業を行う場合には、荷役作業に用いない主巻の巻上ワイヤロープ16を最大限巻き上げたところから更に巻き上げると、ジブ全体が引き込まれて起き上がり、主巻の巻上ワイヤロープ16を繰り出すと、ジブ全体が前に倒れることになる。 On the other hand, as shown in FIG. 2, when the auxiliary winding hoisting wire rope 17 is used and the hanging load 26 is hung on the hanger 25 to perform the cargo handling work, the main winding hoisting wire rope 16 not used for the cargo handling work is performed. When the wind is further wound from the place where the main winding is wound further, the entire jib is pulled in and rises, and when the winding wire rope 16 of the main winding is unwound, the entire jib falls forward.

また、主巻と補巻の各巻上ワイヤロープ16,17を最大限巻き上げたところで主ジブ9及びフライングジブ10の先端近傍に到るよう前記各巻上ワイヤロープ16,17側に装備したストライカ20(補巻側についてのみ図3に図示)と、前記主ジブ9及びフライングジブ10の先端に設けられて前記ストライカ20を受けるストッパ23(補巻側についてのみ図3に図示)とを備えておけば、主巻の巻上ワイヤロープ16又は補巻の巻上ワイヤロープ17を最大限巻き上げた際に、ストライカ20がストッパ23に受け止められて前記巻上ワイヤロープ16又は17の巻き上げが確実に止まり、主ジブ9やフライングジブ10の先端のシーブ21(補巻側についてのみ図3に図示)等をフック等の吊具24又は25との衝突から守りながら巻上装置18,19による巻き上げ力をジブ全体の引き込み力として効果的に作用させることが可能となる。 Further, the striker 20 (striker 20) equipped on the winding wire ropes 16 and 17 side so as to reach the vicinity of the tips of the main jib 9 and the flying jib 10 when the winding wire ropes 16 and 17 of the main winding and the auxiliary winding are wound to the maximum. If a stopper 23 (shown in FIG. 3 only on the auxiliary winding side) provided at the tips of the main jib 9 and the flying jib 10 to receive the striker 20 (shown in FIG. 3 only on the auxiliary winding side) is provided. When the winding wire rope 16 of the main winding or the winding wire rope 17 of the auxiliary winding is wound to the maximum, the striker 20 is received by the stopper 23 and the winding of the winding wire rope 16 or 17 is surely stopped. The hoisting force of the hoisting devices 18 and 19 is jibed while protecting the sheave 21 at the tip of the main jib 9 and the flying jib 10 (only the auxiliary winding side is shown in FIG. 3) from collision with the hanging tool 24 or 25 such as a hook. It is possible to effectively act as an overall pulling force.

従って、上記形態例によれば、二台の巻上装置18,19だけで荷役作業と引込操作を賄うことができて引込装置を別途設置する必要がなくなるので、メンテナンス性の大幅な向上と顕著なコストダウンを図ることができる。 Therefore, according to the above embodiment, the cargo handling work and the pull-in operation can be covered only by the two hoisting devices 18 and 19, and it is not necessary to separately install the pull-in device, which greatly improves the maintainability and is remarkable. Cost reduction can be achieved.

尚、本発明のジブクレーンは、上述の形態例にのみ限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。 It should be noted that the jib crane of the present invention is not limited to the above-described embodiment, and of course, various modifications can be made without departing from the gist of the present invention.

1 ジブクレーン
8 旋回台
9 主ジブ
10 フライングジブ
16 巻上ワイヤロープ
17 巻上ワイヤロープ
18 巻上装置
19 巻上装置
20 ストライカ
23 ストッパ
1 Jib crane 8 Swivel 9 Main jib 10 Flying jib 16 Hoisting wire rope 17 Hoisting wire rope 18 Hoisting device 19 Hoisting device 20 Striker 23 Stopper

Claims (2)

旋回台に起伏自在に取り付けた主ジブの先端にフライングジブを備え、前記主ジブの先端から吊り降ろした巻上ワイヤロープを主巻とし且つ前記フライングジブの先端から吊り降ろした巻上ワイヤロープを補巻として荷役作業を行い得るようにしたジブクレーンであって、主巻と補巻の巻上ワイヤロープの巻き取り及び繰り出しを行う二台の巻上装置を備え、主巻と補巻の何れか一方の巻上ワイヤロープを使用した荷役作業時に他方の巻上ワイヤロープを最大限巻き上げたところから更に巻き上げることでジブ全体を引込操作し得るよう構成したことを特徴とするジブクレーン。 A flying jib is provided at the tip of the main jib undulatingly attached to the swivel base, and the hoisting wire rope suspended from the tip of the main jib is used as the main winding and the hoisting wire rope suspended from the tip of the flying jib is used as the main winding. It is a jib crane that can perform cargo handling work as a supplementary winding, and is equipped with two hoisting devices that wind and unwind the main winding and the auxiliary winding winding wire rope, and either the main winding or the auxiliary winding. A jib crane characterized in that the entire jib can be pulled in by further winding the other hoisting wire rope from the place where the other hoisting wire rope is wound up to the maximum during cargo handling work using one hoisting wire rope. 主巻と補巻の各巻上ワイヤロープを最大限巻き上げたところで主ジブ及びフライングジブの先端近傍に到るよう前記各巻上ワイヤロープ側に装備したストライカと、前記主ジブ及びフライングジブの先端に設けられて前記ストライカを受けるストッパとを備えたことを特徴とする請求項1に記載のジブクレーン。 A striker equipped on the winding wire rope side and provided at the tips of the main jib and the flying jib so that the main winding and the auxiliary winding wire ropes are wound up to the vicinity of the tips of the main jib and the flying jib. The jib rope according to claim 1, further comprising a stopper for receiving the striker.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56149996A (en) * 1980-03-07 1981-11-20 Philips Nv Indicator for load
JP2004051328A (en) * 2002-07-22 2004-02-19 Mitsubishi Heavy Ind Ltd Jib boom hoisting method of crane and crane
JP2008074498A (en) * 2006-09-18 2008-04-03 Kitagawa Iron Works Co Ltd Jib crane
US20160289051A1 (en) * 2015-03-30 2016-10-06 Oil States Industries, Inc. Crane Having Effectively Coincident Gantry and Boom Forces Upon an Upperstructure
JP2018131303A (en) * 2017-02-16 2018-08-23 株式会社タダノ Crane device with jib

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56149996A (en) * 1980-03-07 1981-11-20 Philips Nv Indicator for load
JP2004051328A (en) * 2002-07-22 2004-02-19 Mitsubishi Heavy Ind Ltd Jib boom hoisting method of crane and crane
JP2008074498A (en) * 2006-09-18 2008-04-03 Kitagawa Iron Works Co Ltd Jib crane
US20160289051A1 (en) * 2015-03-30 2016-10-06 Oil States Industries, Inc. Crane Having Effectively Coincident Gantry and Boom Forces Upon an Upperstructure
JP2018131303A (en) * 2017-02-16 2018-08-23 株式会社タダノ Crane device with jib

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