CN107416547B - Anti-collision method for dismantling cantilever girder of ship unloader - Google Patents
Anti-collision method for dismantling cantilever girder of ship unloader Download PDFInfo
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- CN107416547B CN107416547B CN201710367368.5A CN201710367368A CN107416547B CN 107416547 B CN107416547 B CN 107416547B CN 201710367368 A CN201710367368 A CN 201710367368A CN 107416547 B CN107416547 B CN 107416547B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G67/00—Loading or unloading vehicles
- B65G67/60—Loading or unloading ships
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Abstract
The invention provides an anti-collision method for dismantling a girder of a cantilever of a ship unloader, which is characterized by comprising the following steps: step S1, manufacturing an anti-collision pressure plate; and step S2, welding an anti-collision pressure plate on the girder of the ship unloader cantilever, wherein the anti-collision pressure plate is not welded with the girder in the ship unloader cantilever, and when the hinge of the girder of the cantilever is cut off, impact force generated under the action of gravity is transmitted to the girder in the cantilever step by step through the anti-collision pressure plate. The method provided by the invention can prevent and slow down the situation that the ship body sinks (or the deflection of the hoisting arm is too large) and the ship unloader cantilever girder swings to impact the ship unloader body due to the sudden loading of the hoisting weight on the floating crane hoisting arm when the ship unloader cantilever girder is separated from the girder in the body, so that the safety and the uncontrolled hoisting are caused.
Description
Technical Field
The invention relates to the field of dismantling construction of port machinery equipment, in particular to an anti-collision method for dismantling a cantilever girder of a ship unloader.
Background
At present, a grab bucket type ship unloader is the main ship unloading equipment of the current bulk cargo wharf, and tens of thousands of grab bucket type ship unloaders are distributed on inland rivers and coastal wharfs. Along with the use frequency and the operation working condition of the ship unloader, the corrosion of a steel structure can occur, the deflection of a cantilever girder exceeds the standard, main stressed components such as the girder and a door frame large inclined strut are cracked, the equipment of the whole unloader is degraded, the safety performance is not guaranteed, and the service life of the unloader is generally between 20 and 25 years; due to the technical progress, the bulk cargo ship unloading equipment at the wharf is gradually replaced by a continuous ship unloader which has higher efficiency, lower energy consumption and more environment-friendly operation process; therefore, the dismantling construction of the ship unloader is eliminated, and the market demand is high every year.
The weight of a cantilever girder of the ship unloader is about 110 t; the cantilever girder is connected with a girder in the ship unloader body by a movable hinge, and a steel rail is laid on the upper part of the girder and used for a material taking trolley to take materials back and forth; a pull rod and a steel wire rope are arranged at the outer side end of the cantilever girder and the upper tower frame beam, the pull rod is used for decomposing the stress of the cantilever beam, and the steel wire rope is used for pitching the cantilever; the cantilever girder extends out of the wharf edge by 30-48m and is hoisted and dismantled by a 1000t floating crane, if the recovery impact when the pull rod is cut off and the impact force when the cantilever girder is separated from the ship unloader body cannot be processed, the pull rod or the cantilever girder can be collided with the ship unloader body, and the ship unloader is arranged on a wharf rail and has weak side impact resistance, so that the ship unloader can be tipped over or dismantled by personnel to fall off, and thus, the wharf is safely dismantled, and huge hidden danger is caused.
When the known ship unloader is disassembled, in order to prevent the cantilever girder from impacting the ship unloader body too much, a steel supporting plate is welded on the lower portion of a box beam steel plate of the middle girder at a hinge of the ship unloader in advance, when the cantilever girder is subjected to gas cutting and disconnected at the hinge, a suspension arm of a floating crane is stressed to deflect downwards, the cantilever girder instantly falls on the bottom supporting plate, and the supporting plate temporarily bears the downward weight and the side swinging impact force of the cantilever girder, so that the impact on the ship unloader body is relieved. 1/2 of the length of the supporting plate is welded on a steel plate at the lower part of the box girder of the middle girder in an upward and vertical mode, in addition, 1/2 strides over a hinge and extends into the lower part of the cantilever beam, because the supporting plate bears heavy weight and impact force, the specification of the supporting plate is generally 500 × 200 × 25, 3 box girders at each side are provided, the upward welding operation of the supporting steel supporting plate is very difficult, the welding quality is difficult to ensure, an overhanging welding operation platform (the height of the lower part of the platform is about 30m) needs to be erected at the lower part of the middle girder, the erection and the removal of the platform are very dangerous, and the safety cannot be ensured. Therefore, the known technology has a plurality of inconveniences, and the anti-collision supporting plate is installed and welded, so that great potential safety hazards are left for operators.
Disclosure of Invention
In view of the above, the present invention provides an anti-collision method for dismantling a boom girder of a ship unloader, which aims to solve the above problems.
The invention provides an anti-collision method for dismantling a girder of a cantilever of a ship unloader, which is characterized by comprising the following steps of:
step S1, manufacturing an anti-collision pressure plate;
and step S2, welding an anti-collision pressure plate on the girder of the ship unloader cantilever, wherein the anti-collision pressure plate is not welded with the girder in the ship unloader cantilever, and when the hinge of the girder of the cantilever is cut off, impact force generated under the action of gravity is transmitted to the girder in the cantilever step by step through the anti-collision pressure plate.
Further, in the anti-collision method for dismantling the cantilever girder of the ship unloader, the anti-collision pressure plate is made of Q235 hot rolled steel plates; the middle part of the anti-collision pressing plate is provided with a groove with a certain size, the end part of the anti-collision pressing plate is designed into an inclined plane with a preset angle, and the junction of the horizontal plane of the pressing plate and the inclined plane is provided with a radius angle with a preset size.
Further, the anti-collision method for dismantling the cantilever girder of the ship unloader is characterized in that during installation, V-shaped grooves are arranged on two sides of an anti-collision pressure plate to be welded, the anti-collision pressure plate is fully welded on a steel plate on the upper portion of the box-shaped beam of the cantilever girder, and the grooves are located at a gas cutting limit of the cantilever girder and the middle girder.
Furthermore, the specification of the anti-collision pressure plate is 450mm by 200mm by 20-25 mm; at the middle part of crashproof clamp plate, the recess wall is semi-circular, and semicircle radius 25mm, welding length 175mm, the angle is preset on the inclined plane for 30 degrees, radius of rounding off 150 mm.
Further, in the anti-collision method for dismantling the cantilever girder of the ship unloader, the anti-collision method is characterized in that a gap with a certain size is formed between the middle girder and the anti-collision pressing plate.
Further, in the anti-collision method for dismantling the cantilever girder of the ship unloader, the size of the gap is 5 mm.
The invention has the beneficial effects that: due to the unique design and the welding position of the anti-collision pressure plate, when the ship unloader cantilever beam is separated from the beam in the body, the ship body is sunk (or the deflection of the hoisting arm is too large) and the ship unloader cantilever beam swings to impact the ship unloader body due to the sudden loading of the hoisting weight on the floating crane hoisting arm, so that the situations of safety and out-of-control hoisting occur.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a front view of an embodiment of the present invention
FIG. 2 shows an anti-crash pressure plate according to an embodiment of the present invention
FIG. 3 shows a ship unloader according to an embodiment of the present invention
Wherein: 1. anti-collision pressure plate 2, ship unloader 101, cantilever girder welding section 102, hinge gas cutting section 103, gravity buffering section 104, impact force buffering section (fillet) 105, impact force buffering section (inclined plane) 106, welding joint 201, cantilever girder 202, front pull rod 203, pitch hinge 204, cantilever middle girder 205, upright post door leg 206, reinforced concrete ground 207, rail travelling wheel
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The Bao steel raw material wharf 18U3 ship unloader is a grab bucket type double-cantilever bulk material ship unloader, the elevation of sea side girders, namely cantilever girders 201 (weight: 110t, box girder specification: 44 × 10 × 2.2m) and land side girder cantilever girders 204 (weight: 90t, box girder specification: 34 × 11 × 2.2m) is 31m, and the sea side girders are connected with girder bodies in the ship unloader through hinges.
In the implementation, step S1 is carried out to manufacture the anti-collision pressure plate 1; and step S2, welding an anti-collision pressure plate on the ship unloader cantilever girder 201, wherein the anti-collision pressure plate is not welded with the ship unloader cantilever girder 204, and when the cantilever girder hinge is cut off, impact force generated under the action of gravity is transmitted to the cantilever girder through the anti-collision pressure plate step by step.
Manufacturing an anti-collision pressure plate by using a Q235 hot-rolled steel plate; at the middle part of anticollision clamp plate, set up the recess of equidimension, the setting of recess is for the convenience of gas cutting hinge, and anticollision clamp plate tip design is the inclined plane of predetermineeing the angle, and clamp plate horizontal plane sets up the radius fillet of predetermined size with inclined plane juncture. The wall surface of the groove is here provided in a semi-circular shape.
During installation, V-shaped grooves are arranged on two sides of the anti-collision pressure plate to be welded, the anti-collision pressure plate is fully welded on a steel plate on the upper portion of a box-shaped beam of the cantilever girder, and the semicircle is located at a gas cutting limit of the cantilever girder and the middle girder.
The cantilever beam of the ship unloader is a door frame tower type box beam, two anti-collision pressure plates are symmetrically welded and installed at the position 300mm away from the two sides of the central line of the box beam (the distance can be adjusted according to the real situation) on the top steel plate of each box beam of the cantilever girder, and the sea side girder comprises two cantilever box beams, so that 4 anti-collision pressure plates are required to be welded.
The specification of the anti-collision pressure plate is 450mm by 200mm by 20-25 mm; at the middle part of crashproof clamp plate, semicircle radius 25mm, welding length 175mm, the angle is preset on the inclined plane for 30 degrees, radius of rounding 150 mm.
The middle girder and the anti-collision pressure plate have a certain gap, and the gap is 5 mm.
In the dismounting project of 2016, the inventor technology of the anti-collision pressing plate is successfully utilized, 1200t floating cranes are adopted to hoist and dismount the sea side cantilever beams and the land side cantilever beams of the ship unloader, the safety and the stability are realized, and the generated impact force on the ship unloader body is controllable.
The anti-collision pressure plate achieves the purpose of buffering impact force in the following mode:
1. when the cantilever girder hinge is cut off, the downward weight impact force is transmitted to the girder in the ship unloader body (vertical stress) through the anti-collision pressing plate welded on the steel plate on the upper part of the cantilever box girder;
2. the upper part of the middle girder is not welded with the anti-collision pressure plate, and a gap of 5mm is formed (the height h of the anti-collision pressure plate is 195mm), and the gap is small and no large impact is generated, so that the first-stage speed reduction is realized;
3. the 30-degree bevel is designed at the position of 100mm at the end part L4 of the anti-collision pressure plate, and the radius r of the fillet at the transition position is 50mm, so that the speed of the cantilever girder when the cantilever girder is separated from the hinge can be reduced, the swinging impact force is decomposed, the (round angle) is reduced at the second level, and the (30-degree bevel) is reduced at the third level.
In the implementation of the invention, due to the unique design and welding position of the anti-collision pressure plate, when the sea-side and land-side cantilever girders of the ship unloader are separated from the girders in the ship body, the ship body is sunk (or the deflection of the hoisting arm is overlarge) and the ship unloader cantilever girders swing to impact the ship unloader body due to the sudden loading of the hoisting weight on the hoisting arm of the floating crane, so that the situations of safety and out-of-control hoisting occur.
The anti-collision method can also be used for the installation and the removal construction of the large cantilever steel structure.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (5)
1. An anti-collision method for dismantling a girder of a cantilever of a ship unloader is characterized by comprising the following steps:
step S1, manufacturing an anti-collision pressure plate;
step S2, an anti-collision pressure plate is welded on a girder of a cantilever of the ship unloader, the anti-collision pressure plate is not welded with the girder in the cantilever of the ship unloader, and when a hinge of the girder of the cantilever is cut off, impact force generated under the action of gravity is transmitted to the girder in the cantilever step by step through the anti-collision pressure plate;
a preset gap is formed between the girder in the cantilever and the anti-collision pressure plate;
the anti-collision device is characterized in that the middle of the anti-collision pressing plate is provided with a groove, the end part of the anti-collision pressing plate is provided with an inclined plane with a preset angle, and the junction of the horizontal plane of the pressing plate and the inclined plane is provided with a fillet with a preset radius.
2. The method of claim 1, wherein the crash pressure plate is made of a Q235 hot rolled steel plate.
3. The method of claim 1, wherein the step of installing the impact preventing member includes the step of providing a V-groove on both sides of the impact preventing pressing plate to be welded, and fully welding the V-groove to the steel plate on the box beam of the cantilever girder, so that the groove is located at the gas cutting boundary between the cantilever girder and the middle girder.
4. The method of claim 1, wherein the crush plate is 450mm by 200mm by 20 to 25 mm; at the middle part of crashproof clamp plate, the recess wall is semi-circular, and semicircle radius 25mm, welding length 175mm, the angle is preset on the inclined plane for 30 degrees, radius of rounding off 150 mm.
5. The method of claim 1, wherein the size of the gap is 5 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710367368.5A CN107416547B (en) | 2017-05-23 | 2017-05-23 | Anti-collision method for dismantling cantilever girder of ship unloader |
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| CN201710367368.5A CN107416547B (en) | 2017-05-23 | 2017-05-23 | Anti-collision method for dismantling cantilever girder of ship unloader |
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| CN107416547B true CN107416547B (en) | 2020-02-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5971177A (en) * | 1998-04-09 | 1999-10-26 | Carter; E. Dan | Pickup crane |
| JP2001200653A (en) * | 2000-01-19 | 2001-07-27 | Shimizu Corp | Seismic controlling building |
| CN2717910Y (en) * | 2004-07-23 | 2005-08-17 | 傅国华 | Crane main girder capable of restoring upper camber |
| CN102556853B (en) * | 2011-12-31 | 2014-03-19 | 攀钢集团工程技术有限公司 | Metallurgical crane dismantling method |
| CN103058070B (en) * | 2012-12-28 | 2014-12-10 | 徐州重型机械有限公司 | An introducing beam and a tower crane |
| CN203740851U (en) * | 2013-10-28 | 2014-07-30 | 中船华南船舶机械有限公司 | Detachable lifting beam |
| CN104192579B (en) * | 2014-08-20 | 2017-02-15 | 东北大学 | Method for replacing material taking machine jackstay and material taking machine jackstay used for method |
| CN106477350B (en) * | 2015-08-31 | 2019-05-28 | 中冶宝钢技术服务有限公司 | The method for dismounting of bridge ship loader-unloader |
| CN105905810B (en) * | 2016-06-28 | 2017-07-21 | 青岛海西重机有限责任公司 | A kind of ship unloaders drivers' cab safeties |
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