Method for dismantling a large bulk ship loader

Abstract

The application discloses a large-scale bulk cargo ship loader dismounting method, which comprises the following steps: installing a large-scale bulk cargo ship loader dismounting protection device on the bulk cargo ship loader, wherein the large-scale bulk cargo ship loader dismounting protection device comprises a movable belt frame vehicle temporary support, a first main column temporary support and a second main column and inclined column temporary support; placing the movable belt frame vehicle; dismounting a machine room and a cab; dividing the movable belt frame vehicle into two sections and dismounting a section of the movable belt frame vehicle away from a main body structure section; dismounting a structure above a 15m platform; dismounting the first main column; dismounting the 15m platform; dismounting a remaining section of the movable belt frame vehicle; dismounting a part above a 5m platform; dismounting a remaining part of the second main column; and dismounting a remaining part of the inclined column. The large-scale bulk cargo ship loader dismounting method can maintain the stability of the overall structure of the large-scale bulk cargo ship loader during the dismounting process, avoids structure overturning, is simple in dismounting operation, low in cost and extremely promising in application.

Description

Technical Field

[0001] This invention relates to the field of port machinery equipment dismantling and construction technology, and to a method for dismantling a large bulk cargo ship loader. Background Technology

[0002] 500t / h and 800t / h ship loaders are the main loading equipment at existing bulk cargo terminals, widely distributed across inland and coastal wharves. Terminal transportation operates continuously year-round. As the service life of ship loaders increases, their working conditions gradually deteriorate, their steel structures corrode and deform, and major load-bearing components crack, compromising equipment safety. The service life of ship loaders is generally around 20 years. Due to technological advancements, conventional bulk cargo ship loaders will gradually be replaced by more efficient and energy-efficient all-weather intelligent ship loaders. Therefore, the annual market demand for the dismantling of existing ship loaders is substantial.

[0003] Ship loader dismantling typically employs a dismantling process of "gas cutting disassembly and modular hoisting." The main frame of the ship loader is an irregular steel structure support system. During the disassembly, detachment, and hoisting of ship loader components, the steel structure support system is highly susceptible to instability, which can lead to safety accidents such as ship loader overturning and collapse.

[0004] The existing concrete beams and slabs of the wharf are all installed on the top of the pile foundation in the water, which has limited bearing capacity. Most cargo wharves are built with strip or L-shaped structures, and the wharf operation space is narrow. Large cranes cannot enter the wharf area. The 500-800t / h ship loader has a large single weight and needs to be dismantled into sections and components first, and then lifted and dismantled by small cranes. In order to prevent the ship loader from becoming unstable and overturning during gas cutting and lifting and dismantling, its steel structure support system must be reinforced before dismantling.

[0005] Therefore, developing a safe and effective method for dismantling large bulk cargo ship loaders is of great practical significance. Summary of the Invention

[0006] Due to the aforementioned defects in the existing technology, the present invention provides a method for dismantling a large bulk cargo ship loader, in order to solve the problems of structural overturning and workers falling from heights, high safety risks, and difficulty in ensuring the safety of ship loader dismantling operations during the dismantling of the existing technology.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A method for dismantling a large bulk cargo ship loader, wherein the main structure of the large bulk cargo ship loader (fixed tower tilting cantilever bulk cargo ship loader) includes two first main columns, two second main columns, and two inclined columns. The second main columns are generally of a broken line structure, including an upper second main column and a lower second main column connected to each other. The free end of the lower second main column is in contact with the ground, and the free end of the upper second main column is connected to one end of the first main column. The other end of the first main column is in contact with the ground. The two ends of the inclined columns are connected to the first main columns and the connection points of the upper and lower second main columns, respectively. The first main columns, inclined columns, and upper second main columns together form a triangular structure. The steps are as follows:

[0009] (1) Install a large bulk cargo loader dismantling protection device on the bulk cargo loader (fixed tower tilting cantilever bulk cargo loader). The large bulk cargo loader dismantling protection device includes a temporary support for the movable belt conveyor trolley, a temporary support for the first main column (8# channel steel), and temporary supports for the second main column and inclined column. The temporary support for the movable belt conveyor trolley is used to provide temporary support for the movable belt conveyor trolley. It is arranged on the side of the loader where the movable belt conveyor trolley is located. It is located below the movable belt conveyor trolley and is fixedly connected to the main beam on the wheel rail of the loader. The temporary support for the first main column is used to provide temporary support for the first main column. Each first main column supports... Two temporary supports for the first main column should be provided. The two ends of the temporary supports for the first main column are connected to the first main column and the main beam of the computer room platform, respectively (the temporary supports for the first main column are welded to the first main column in a fully welded manner on all four sides). The two temporary supports for the first main column provide triangular support for the first main column. The temporary supports for the second main column and the inclined column are used to provide temporary support for the second main column and the inclined column. The temporary supports for the second main column and the inclined column are located below the lower second main column and the inclined column. The upper end of the temporary supports for the second main column and the inclined column is connected to the lower second main column and the inclined column, and the lower end is in contact with the ground, thereby providing temporary support for the lower second main column and the inclined column.

[0010] (2) Lay the movable belt rack flat;

[0011] (3) Dismantle the machine room and driver's cab;

[0012] (4) Divide the movable belt conveyor into two sections and remove the section of the movable belt conveyor away from the main structure;

[0013] (5) Demolish the structure above the 15m platform;

[0014] (6) Remove the first main column;

[0015] (7) Dismantle the 15m platform;

[0016] (8) Remove the remaining section of the movable belt conveyor;

[0017] (9) Remove the portion of the platform above 5m;

[0018] (10) Remove the remaining part of the second main column;

[0019] (11) Remove the remaining part of the inclined column.

[0020] This invention discloses a method for dismantling a large bulk material loader, which, in conjunction with a simple overall structure and a protective device for dismantling the large bulk material loader, and a reasonable dismantling sequence design, not only allows for rapid dismantling but also maintains the overall structural stability of the large bulk material loader during dismantling, preventing structural overturning and personnel falls from heights. This significantly improves the safety of the dismantling process, is relatively simple to operate, requires minimal equipment, and is inexpensive, making it highly promising for application.

[0021] As a preferred technical solution:

[0022] As described above, in the dismantling method of a large bulk cargo ship loader, the temporary support for the movable belt conveyor includes a first gantry frame arranged vertically to the ground.

[0023] The first portal frame includes an upper crossbeam I, a lower crossbeam I, and two columns I connecting the upper and lower crossbeams I (the upper crossbeam I, the lower crossbeam I, and the two columns I are made of 300H-beam steel). The first portal frame is provided with an internal support I for strengthening the structure of the first portal frame (the internal support I is made of 150H-beam steel or channel steel). The protection scope of the materials of each component of the present invention is not limited to this. Those skilled in the art can select appropriate materials according to the actual situation.

[0024] The lower crossbeam I is in contact with and parallel to the ground. Each column I is connected to a side brace I and a horizontally arranged support I. The side brace I is welded to the upper wall of the main beam on the ship loader's wheel rail, and the horizontally arranged support I is welded to the side wall of the main beam on the ship loader's wheel rail. The specific structure of the temporary support for the movable belt conveyor trolley of the present invention is not limited to this. Those skilled in the art can design the actual structure of the temporary support for the movable belt conveyor trolley according to the actual situation. Of course, the simple design described above can also ensure effective support for the movable belt conveyor trolley during the dismantling of the large bulk ship loader, avoid structural overturning during the dismantling of the large bulk ship loader, and thus significantly improve the safety of the ship loader dismantling operation.

[0025] The dismantling method of a large bulk cargo ship loader as described above, the dismantling protection device of the large bulk cargo ship loader further includes two structural support members located above the temporary support of the first main column. One end of the structural support member is connected to the first main column, and the other end is connected to the upper second main column. The connection between the structural support member and the first main column is higher than the connection between the temporary support of the first main column and the first main column.

[0026] The decomposition point of the first main column is located between the connection between the structural support and the first main column and the connection between the temporary support and the first main column. The presence of the structural support ensures that the relative positions of the first main column and the upper second main column do not change when the superstructure is dismantled, thus avoiding construction safety risks caused by changes in the angle between the first main column and the upper second main column during hoisting.

[0027] As described above, in the dismantling method of a large bulk cargo ship loader, the temporary support for the second main column and inclined column includes a second portal frame arranged vertically to the ground.

[0028] The second portal frame includes an upper crossbeam II, a lower crossbeam II, and two columns II connecting the upper and lower crossbeams II. The second portal frame is provided with an internal support II for strengthening the structure of the second portal frame.

[0029] The lower crossbeam II is in contact with and parallel to the ground. The tops of the two columns II are welded to the inclined columns. Each column II is connected to a horizontally arranged support II and a side brace II. The horizontally arranged support II is welded to the side wall of the main beam on the ship loader's wheel rail. The side brace II is welded to the lower second main column. A crossbeam III connecting the two side supports II is also provided on the fixed side of the side brace II and the lower second main column. The specific structure of the temporary support for the second main column and inclined column of the present invention is not limited to this. Those skilled in the art can design the actual structure of the temporary support for the second main column and inclined column according to the actual situation. Of course, the above simple design can also ensure effective support for the second main column and inclined column during the dismantling of the large bulk ship loader, avoid structural overturning during the dismantling of the large bulk ship loader, and thus significantly improve the safety of the ship loader dismantling operation. In addition, those skilled in the art can also divide the integral temporary support structure for the second main column and inclined column into multiple parts. Of course, the integral structure has better stability and can better ensure the construction safety of the dismantling process of the large bulk ship loader.

[0030] The dismantling method for a large bulk cargo ship loader as described above, specifically step (1) is as follows:

[0031] (1.1) The temporary support of the hoisting mobile belt frame vehicle makes the first gantry frame perpendicular to the ground, and welds the side support I and the horizontally arranged support I to the main beam on the wheel rail of the ship loader into one piece;

[0032] (1.2) After using a hand chain hoist to lift the temporary support of the first main column to the designated position, weld the two ends of the temporary support of the first main column to the main beam of the computer room platform and the first main column respectively;

[0033] (1.3) After using a hand chain hoist to lift the structural support to the designated position, weld the two ends of the structural support to the upper second main column and the first main column respectively;

[0034] (1.4) After using a hand-operated hoist to lift the second gantry frame to the designated position, weld the top of column II to the inclined column, weld the side support II to the lower second main column, and weld the horizontally arranged support II to the upper beam of the ship loader wheel rail.

[0035] As described above, in the dismantling method of a large bulk cargo ship loader, step (2) of leveling the movable belt trolley refers to using a crane to lift the movable belt trolley, cutting the wire rope connecting the movable belt trolley to the bulk cargo ship loader, and then controlling the crane to level the movable belt trolley.

[0036] The dismantling method of a large bulk cargo ship loader described above, in steps (3) to (11), refers to cutting the section to be dismantled after fixing it on the crane, and then using the crane to lift the section to be dismantled to the designated position.

[0037] The above invention has the following advantages or beneficial effects:

[0038] This invention discloses a method for dismantling a large bulk cargo ship loader, which, in conjunction with a simple overall structure and a protective device for dismantling the large bulk cargo ship loader (simple and convenient to manufacture and install), and a reasonable dismantling sequence design (the ship loader body is rationally divided into sections, breaking it down into smaller parts, and controlling the structural weight and dimensions of each lifting and dismantling operation within the capacity of a small truck crane, greatly reducing construction costs and ensuring safe and controllable dismantling operations), not only allows for rapid dismantling but also maintains the overall structure of the large bulk cargo ship loader during the dismantling process. The stability of the system is improved, preventing structural overturning and worker falls from heights. This significantly enhances the safety of dismantling large bulk cargo ship loaders. The dismantling operation is relatively simple, with low requirements for equipment and site conditions (a small truck crane can be used, suitable for most existing bulk cargo loading terminals with narrow operating spaces and strip or L-shaped structures). The cost is low, and it can provide technical reference for similar projects of ship loader dismantling operations at terminals. The number of steps in the "ten-step dismantling and hoisting operation method" of this invention can be appropriately increased or decreased according to the structural dimensions and weight of the ship loader and the actual site conditions, making it highly promising for application. Attached Figure Description

[0039] The invention, its features, shape, and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference numerals denote like parts throughout the drawings. The drawings are not drawn to scale; their focus is on illustrating the gist of the invention.

[0040] Figure 1 A schematic diagram of a large bulk ship loader equipped with a large bulk ship loader removal protection device (step (1) end state);

[0041] Figure 2 and 3 These are the front and left views of the temporary support for the movable belt conveyor trolley;

[0042] Figure 4 and 5 These are the front and left views of the temporary supports for the second main column and the inclined column, respectively.

[0043] Figures 6 to 13 These are schematic diagrams for steps (2) to (9);

[0044] Figure 14 A schematic diagram showing the removal of the remaining parts of the second main column and the remaining parts of the inclined column;

[0045] Figure 15 This is a schematic diagram of the hoisting installation in the computer room.

[0046] Among them, 1-temporary support for the movable belt conveyor trolley, 101-upper crossbeam I, 102-inner support I, 103-side brace I, 104-support I, 105-column I, 106-lower crossbeam I, 2-temporary support for the first main column, 3-temporary support for the second main column and inclined column, 301-column II, 302-inner support II, 303-support II, 304-side brace II, 305-lower crossbeam II, 4-structural support component, 5-movable belt conveyor trolley, 6-first main column, 7-inclined column, 8-lower second main column, 9-upper second main column, 10-ship loader wheel rail upper beam, 11-machine room, 12-cab, 13-15m platform, 14-manual hoist. Detailed Implementation

[0047] The structure of the present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0048] Example 1

[0049] A method for dismantling a large bulk cargo ship loader is specifically applied to the construction of 800t / h and 500t / h ship loaders in the Baosteel Transportation Department's slag chemical production wharf scrapped fixed asset dismantling and disposal project. The main structure of the large bulk cargo ship loader includes two first main columns 6, two second main columns, and two inclined columns 7. The second main columns are generally of a broken line structure, including an upper second main column 9 and a lower second main column 8 connected to each other. The free end of the lower second main column 8 is in contact with the ground, and the free end of the upper second main column 9 is connected to one end of the first main column 6. The other end of the first main column 6 is in contact with the ground. The two ends of the inclined columns 7 are connected to the connection points of the first main column 6, the upper second main column 9, and the lower second main column 8, respectively. The first main column 6, the inclined columns 7, and the upper second main column 9 together form a triangular structure. The steps are as follows:

[0050] (1) Ship loader dismantling is usually carried out by disassembly. Since the structure of the ship loader is irregular, partial dismantling can easily lead to an unstable structure. Therefore, the structure of the ship loader needs to be reinforced before the dismantling operation. Large bulk ship loader dismantling protection devices are installed on the bulk ship loader:

[0051] (1.1) Fabrication and installation of temporary supports for the movable belt-driven vehicle;

[0052] When the movable belt conveyor is lowered and flattened, its lower part needs temporary support from the movable belt conveyor to provide support; otherwise, it will lose weight and there is a risk of structural overturning.

[0053] The temporary support of the hoisting conveyor belt trolley ensures that the first gantry frame is perpendicular to the ground. The lower crossbeam I is in contact with the ground and parallel to the ground, and is supported by the vertical column I. The first gantry frame is 2.5m wide and 8m high. The specific dimensions are based on the placement of the movable conveyor belt trolley with the head slightly upward. After the fabrication is completed on the ground, it is installed 1.5m from the edge of the dock. A 100-ton crane with a hoisting radius of 10 meters is used for installation. The main boom is 18.2m long and 16 meters high. On-site installation can be done according to hoisting requirements. After the crane erects the 8-meter support, workers on the ground use steel sections to firmly connect the support and the lower crossbeam of the ship loader (that is, weld the side brace I and the horizontally arranged support I to the main beam on the ship loader wheel rail as one piece). The hoisting wire rope is unhooked using the lifting vehicle.

[0054] (1.2) Fabrication and installation of temporary supports and structural support components for the first main column:

[0055] Due to crane constraints, the upper part of the first main column needs to be dismantled first during dismantling. After dismantling, it needs to be reinforced to prevent weight loss. During this dismantling, two No. 8 channel steels were used as temporary supports for each first main column. One end of the temporary support was supported on the main beam of the machine room platform, and the other end was supported on the column (0.5m on the 18m platform) to form a triangular support. The support was welded on three sides and installed using two 1-ton hand chain hoists. The temporary support point of the first main column must be located below the dismantling point and connected by full welding on all four sides. After the structural support was lifted to the designated position using the hand chain hoists, the two ends of the structural support were welded to the second and first main columns respectively.

[0056] (1.3) Fabrication and installation of temporary supports for the second main column and diagonal column:

[0057] The temporary supports for the second main column and the inclined column are made of H-beams of not less than 250 mm to form a second portal frame. The bottom of the second portal frame must be a transverse beam and the force is borne on the column II perpendicular to the dock road surface. The second portal frame must be equipped with diagonal bracing. The diagonal bracing is made of H-beams or channel steel of not less than 100 mm to form a portal frame (i.e., side bracing II + crossbeam III + lower crossbeam II). A 6.4 m * 2.5 m frame (i.e., the second portal frame) is made on the ground. Two lifting lugs are welded to the top of the frame (i.e., the second portal frame). The installation is carried out using two 5-ton hand-operated hoists. The workers stand on the ground and on the boom lift to carry out the construction. The top of column II is welded and fixed to the inclined column. The side bracing II is welded to the lower second main column. The horizontally arranged support II is fixed to the main beam on the ship loader wheel rail by welding.

[0058] The dismantling protection device for large bulk cargo ship loaders is installed on the large bulk cargo ship loaders, such as... Figure 1 As shown, the dismantling protection device for the large bulk cargo ship loader includes a temporary support for the movable belt conveyor trolley 1, a temporary support for the first main column 2, a structural support component 4, and temporary supports for the second main column and inclined column 3.

[0059] The temporary support 1 for the movable belt conveyor trolley is arranged on the side of the ship loader where the movable belt conveyor trolley is located, and it is situated below the movable belt conveyor trolley. The specific details of the temporary support 1 for the movable belt conveyor trolley are as follows: Figure 2 and 3The system includes a first portal frame arranged vertically to the ground. The first portal frame includes an upper crossbeam I 101, a lower crossbeam I 106, and two columns I 105 connecting the upper and lower crossbeams I (the upper crossbeam I 101, the lower crossbeam I 106, and the two columns I 105 are made of 300H-section steel). The first portal frame is equipped with an internal support I 102 for strengthening the structure of the first portal frame (the internal support I 102 is made of 150H-section steel or channel steel). The lower crossbeam I 106 is in contact with the ground and parallel to the ground. Each column I 105 is connected to a side brace I 103 and a horizontally arranged support I 104. The side brace I 103 is welded to the upper wall of the main beam 10 on the ship loader wheel rail, and the horizontally arranged support I 104 is welded to the side wall of the main beam 10 on the ship loader wheel rail.

[0060] Each first main column 6 is provided with two first main column temporary supports 2 (8# channel steel). The two ends of the first main column temporary supports 2 are connected to the first main column 6 and the main beam of the computer room platform respectively (the first main column temporary supports 2 and the first main column 6 are welded in the form of full welding around the perimeter). The two first main column temporary supports 2 provide triangular support for the first main column 6. There are two structural support members 4, located above the first main column temporary supports 2. One end of the structural support member 4 is connected to the first main column 6, and the other end is connected to the upper second main column 9. The connection between the structural support member 4 and the first main column 6 is higher than the connection between the first main column temporary supports 2 and the first main column 6. The decomposition point of the first main column 6 is located between the connection between the structural support member 4 and the first main column 6 and the connection between the first main column temporary supports 2 and the first main column 6.

[0061] The second main column and the temporary support 3 for the inclined column are located below the inclined column 7 and the lower second main column 8. The temporary support 3 for the second main column and the inclined column is as follows: Figure 4 and 5 As shown, a second portal frame is arranged vertically to the ground. The second portal frame includes an upper crossbeam II, a lower crossbeam II 305, and two columns II 301 connecting the upper and lower crossbeams II. The frame of the second portal frame is provided with an internal support II 302 for strengthening the structure of the second portal frame. The lower crossbeam II 305 is in contact with the ground and parallel to the ground. The tops of the two columns II 301 are welded and fixed to the inclined column 7. Each column II 301 is connected to a horizontally arranged support II 303 and a side support II 304. The side support II 304 is fixed to the lower second main column 8 and is also provided with a crossbeam III connecting the two side supports II 304. The horizontally arranged support II 303 is welded and fixed to the side wall of the main beam 10 on the ship loader wheel rail. The side support II 304 is welded and fixed to the lower second main column 8.

[0062] (2) Lay the movable belt rack flat, such as Figure 6 As shown:

[0063] Based on the actual site conditions, a 100-ton truck crane was selected to level the movable conveyor belt frame. Two long steel wire ropes were used. The crane has a maximum working radius of 16m and a main boom length of 30m. For the crane and its positioning, please refer to the relevant information on the crane and its positioning.

[0064] Lifting point setup: The hoisting is carried out using the movable pulley axle of the main body of the mobile belt frame. Two steel wire ropes pass through the two main body pulleys respectively and return to the hook.

[0065] Worker positioning: The personnel of this crane shall stand on the articulated boom lift for operation.

[0066] The specific steps for demolition are as follows:

[0067] 1) Position the 100-ton station and hoist the steel wire rope used to the vicinity of the hoisting point.

[0068] 2) Using a boom lift, transport two people to the hook point of the movable belt frame (approximately 20 meters high). Thread the wire rope through the pulley axle, hang the wire rope onto the crane hook, and evacuate the personnel after confirming that the crane hook safety buckle is correctly closed.

[0069] 3) The crane slowly lifts itself from the hook of the 100-ton crane. After the wire rope is lightly stressed, a test lift is performed. Once it is confirmed that everything is in order, the entire load on the movable conveyor belt is transferred to the crane (the original wire rope is no longer under stress) for stability.

[0070] 4) Two workers boarded the loader platform 18, secured one end of the steel wire rope to be dismantled with a rope, then cut the lower end of the steel wire rope with an oxy-acetylene torch and slowly lowered the steel wire rope.

[0071] 5) The crane operator directs the crane to slowly descend until the movable belt support is firmly supported on the support frame.

[0072] 6) One operator detaches the hook via the mobile crane maintenance platform (only the large hook end of the crane needs to be detached).

[0073] (3) Dismantle the machine room and driver's cab, such as Figure 7 As shown:

[0074] During the dismantling of the machine room and operator's cab, the machine room and operator's cab were first cut around the baseboard to separate them from the platform. These were then hoisted to their designated positions on the ground. Next, the exposed indoor motors, control cabinets, and electrical cabinets were hoisted to their designated positions on the ground. Two steel wire ropes with a diameter of at least φ16mm were used for this hoisting operation.

[0075] When cutting through the server room, it is necessary to confirm whether the server room walls are made of flammable materials (such as foam board). If an abrasive wheel cutter is used, oxyacetylene cutting is prohibited. The server room platform and original handrails must be preserved during the server room demolition.

[0076] Lifting point setup: For the machine room and driver's cab, openings are made in the upper wall panels of the four existing columns, and the four columns are used for lifting (using 5t shackles). (e.g.) Figure 15 (As shown). Indoor motors, control cabinets, etc., are directly hoisted using the original equipment lifting lugs.

[0077] Worker positioning: During cutting operations, workers should stand on the 15m platform. When cutting at lifting points or hooking wire ropes, workers should stand on the boom lift.

[0078] Demolition steps:

[0079] 1) Cut a line around the baseboard of the computer room to separate the computer room from the platform.

[0080] 2) Use a boom lift to carry two people to the top side of the machine room, cut the hoisting hole, hook the wire rope, and then evacuate the personnel.

[0081] 3) The crane slowly lifts the machine room onto its hook, and after the wire rope is lightly stressed, a trial lift is performed. Once safety is confirmed, the machine room is lifted to the designated location.

[0082] 4) Hoist the motor, control cabinet, and electrical cabinet to their designated positions on the ground.

[0083] (4) Divide the movable belt conveyor into two sections, and dismantle the section of the movable belt conveyor away from the main structure, such as... Figure 8 As shown:

[0084] To prevent overall center of gravity imbalance, the movable belt conveyor was cut and lifted in sections. To prevent displacement of the telescopic boom, the boom frame and the outer frame of the boom were welded together before cutting, with no fewer than two welds, one at the beginning and one at the end. The section being dismantled was the head section of the movable belt conveyor; the cutting point for this section was 2 meters from the center of the original moving pulley support frame. Two φ26mm diameter steel wire ropes were used for lifting.

[0085] Lifting point setup: The lifting points are the same as in "Step 2," using two prime mover shafts as lifting points. To prevent center of gravity deviation, a 10t hand-operated hoist is used for auxiliary adjustment and balance during this lifting operation. Specifically, an additional 10t hand-operated hoist is added on the head side for balance adjustment, with the force on the crossbeam of the outer frame of the gantry crane.

[0086] Worker positioning: The cutting personnel will stand on the original maintenance platform of the movable belt-driven gantry. First, the internal structure of the gantry frame (telescopic gantry) will be cut. Then, the frame will be cut using a boom lift. The bottom frame will be cut first, followed by the upper frame.

[0087] The specific steps for demolition are as follows:

[0088] 1) The telescopic boom and the outer frame of the boom are welded together using L50 angle steel. There are 4 connection points, and the distance between each connection point is about 2.5m. The first and second connection points are about 1.25m in front of and behind the center of the original moving pulley support frame.

[0089] 2) A 10t hand-operated hoist is added to the original maintenance platform on the movable belt conveyor trolley, located on the front side of the trolley. The hand-operated hoist is connected to the upper crossbeam of the outer frame of the trolley using a short steel wire rope (approximately 1m) with a diameter of no less than φ16mm. Guy ropes, each 30m long, are suspended at both ends of the section of the movable belt conveyor trolley that has been dismantled.

[0090] 3) Using a boom lift, carry one person to the hook point of the movable belt frame, and attach the other end of the wire rope and the hand chain hoist to the crane hook.

[0091] 4) The crane slowly lifts the cable onto the hook, and after the wire rope is lightly stressed, adjust the hand-operated hoist for adjustment and perform a test lift. Once confirmed to be correct, lift it to the designated position on the dock.

[0092] (5) Demolish structures above the 15m platform, such as Figure 9 As shown:

[0093] During dismantling, first tighten the crane hook and wire rope, then apply light force (about half the force used during hoisting, approximately 4 tons), and then proceed with cutting and dismantling.

[0094] Cutting point as Figure 9 As shown, the cutting point of the main column is located 0.6m from the 18m platform. The existing maintenance platform will be used for cutting. The first main column will be cut first, followed by the second. A V-shaped cut will be made on the first main column. During cutting, the first main column will be cut away from the platform first, then the side closer to the platform. When cutting the second main column, the crane needs to be slightly offset towards the first main column. A 2m extended cutting gun must be used when cutting the second main column near the platform. High vigilance is required during cutting, and personnel must immediately evacuate to the control room platform after the cut is completed.

[0095] Lifting point setup: This lifting operation uses a binding method. Two steel wire ropes are passed through the gap between the first and second main columns, around the crossbeam of the fixed pulley block, and then bound together for lifting.

[0096] Worker positioning: During the cutting of the first main column, the workers stood on the 18m maintenance platform and the articulated boom lift. During the cutting of the second main column, the workers stood on the 15m platform. After the cutting was completed, they withdrew from the original staircase.

[0097] Construction steps:

[0098] 1) Use a boom lift to tie the pulley block beam, and after tying, the wire rope of the crane will be lightly stressed.

[0099] 2) After the wire rope is under tension, the personnel stand on the 18m maintenance platform to cut the column. The first main column is cut with a V-shaped cut. During cutting, the first main column is cut away from the platform first, and then the side closer to the platform is cut. Guy ropes are suspended at both ends of the dismantled section.

[0100] 3) After completing the 18-meter cut, retreat to the 15-meter platform to cut the second main column. First, cut the side furthest from the platform, then cut the side closer to the platform. When cutting the side closer to the platform, use a 2-meter extended cutting gun. After cutting, withdraw from the original staircase.

[0101] 4) The crane operator lifts and transports the crane to a designated location for temporary relocation (disassembly).

[0102] (6) Remove the first main column, such as Figure 10 As shown:

[0103] The first main support column consists of two pillars, each weighing approximately 5 tons. During dismantling, the one on the north side will be removed first, followed by the other pillar. Two steel wire ropes with a diameter of at least φ16mm will be used for hoisting during dismantling. Before all cutting and dismantling, the crane hook will be tightened with the steel wire ropes, and then subjected to light stress.

[0104] Hanging point settings:

[0105] This hoisting operation involved drilling holes on both sides of the box girder and connecting them to wire ropes using 10t shackles. Two holes were drilled on each side, each 100mm x 100mm, with a 60mm distance between them. The box girder wall thickness is 10mm. Considering the equipment has been in use for many years, calculations were performed using a thickness of 6mm and a width of 50mm (this thickness must be confirmed after drilling before formal hoisting). Each hoisting point can withstand a force of 6t, which is greater than the weight of the component and meets the requirements.

[0106] The lifting point is located 1 meter below the center of the beam. To prevent imbalance during lifting, a 5-ton hand-operated hoist is added at the top for adjustment and lifting, with the 5-ton hoist bearing the load on the box girder. Simultaneously, a 2-ton hand-operated hoist is added at the bottom to connect the box girder to the temporary support to prevent swaying after cutting.

[0107] Worker positioning: During the dismantling and cutting of the 18m platform and the cab platform, the personnel will stand on the boom lift, and the bottom of the column will be cut on the 4m maintenance platform. After the cutting is completed, the personnel will evacuate through the original staircase.

[0108] Construction steps:

[0109] The first main support column consists of two columns (support columns 01 and 02), each weighing approximately 5 tons. During dismantling, the first main support column on the north side will be removed first, followed by the other main support column. During dismantling, holes will be cut in the main support plate of the first main support column to insert retaining rings as lifting points.

[0110] The first main column lifting point is drilled, and a steel wire rope and an auxiliary 5t hand-operated hoist are threaded through it. Workers use a boom lift for construction.

[0111] Cut along the upper cutting line, with personnel positioned on the articulated boom lift.

[0112] After installing the 2t hand chain hoist at the bottom, the bottom is cut. Personnel stand on the 4m maintenance platform and evacuate through the original staircase after the cutting is completed.

[0113] The crane operator lifts and transports the object to a designated location for temporary relocation (disassembly).

[0114] (7) Remove the 15m platform, such as Figure 11 As shown:

[0115] For safety reasons, a portion of the 15m platform will be retained. The cutting point is located 1.2m from the crossbeam, as shown below. Figure 11 As shown. Before any cutting or dismantling, the crane hook is tightened with the wire rope, then lightly stressed before cutting and disassembling. Cutting is carried out using the existing 15m platform. A 2m extended cutting gun must be used, and extreme caution must be exercised during cutting. After the cut is completed, personnel must immediately evacuate. (The original handrails on the 15m platform must be preserved during dismantling, and some welded safety anchor points must also be retained for personnel to attach their safety belts.)

[0116] Lifting point setup: This lifting operation will utilize a sling-type hoisting method. A steel wire rope with a diameter of at least φ16mm will be used, passing through the lower opening of the platform's main beam and then through the sling.

[0117] Worker positioning: When cutting the 15m platform during this demolition, the workers will stand on the remaining part of the platform to carry out the work, and will evacuate through the original staircase after the cutting is completed.

[0118] Construction steps:

[0119] 1) Using a boom lift, thread the wire rope through the hole in the lower part of the platform's main beam and hook it up.

[0120] 2) After the wire rope is under tension, the personnel stand on the boom lift and cut the lower 2 / 3 of the platform's main beam. Then, the personnel stand on the 15m platform and cut using a skip-section cutting method. The remaining portion is then cut using a 2m extended cutting gun. After cutting is complete, personnel evacuate via the original staircase.

[0121] 3) The crane operator lifts and transports the crane to a designated location for temporary relocation (disassembly).

[0122] (8) Remove the remaining section of the movable belt conveyor, such as Figure 12 As shown:

[0123] The remaining part of the movable frame is cut at a point located at a distance from the pivot pin of the movable frame. Figure 12 As shown. Two steel wire ropes with a diameter of not less than φ26mm are used to bind the upper (longitudinal) beam of the outer frame of the movable frame vehicle at four points for hoisting. Considering force balance, the hoisting points are located 1m offset from the center point of the remaining section towards the head. A 10t hand-operated hoist is added on the side of the pin shaft for adjustment and balance. The hand-operated hoist bears the force on the lower crossbeam of the outer frame of the movable frame vehicle. During dismantling, after lightly applying force with the crane, the 10t hand-operated hoist is adjusted to achieve balance before cutting.

[0124] Lifting point setup: This lifting operation adopts a strap-on sling-lift method. Steel wire ropes with a diameter of at least φ26mm are used, secured to the upper (longitudinal) beams of the movable frame vehicle at four points for sling-lifting.

[0125] Worker positioning: When dismantling and cutting the remaining parts of the vehicle during this activity, personnel will stand on the maintenance platform on the fixed boom to carry out the work. After the cutting is completed, they will evacuate through the original staircase.

[0126] Construction steps:

[0127] 1) Using the original maintenance platform on the scaffold, pass the wire rope through the lower hole of the upper (longitudinal) beam of the movable scaffold frame and hook it.

[0128] 2) After the wire rope is under tension, personnel stand on the 10m platform to perform cutting. After cutting is completed, personnel evacuate through the original staircase.

[0129] 3) The crane operator lifts and transports the crane to a designated location for temporary relocation (disassembly).

[0130] (9) Remove the portion of the platform above 5m, such as Figure 13 As shown:

[0131] The portion above the 5m platform will be dismantled. The cutting point will be located above the temporary reinforcement support point, 6.5m above the ground, as shown in the diagram below. Two steel wire ropes with a diameter of at least φ26mm will be used to secure the 15m platform crossbeam at four points for hoisting. To ensure balance, a 10t hand-operated hoist will be added to the inclined column for adjustment. The hand-operated hoist will bear the load on the fixed frame crossbeam. During dismantling, after lightly applying load with the crane, the 10t hand-operated hoist will be adjusted to ensure balance before cutting. The inclined column will be cut first, followed by the second main column.

[0132] Lifting point setup: This lifting operation adopts a sling-lift method. Steel wire ropes with a diameter of at least 26mm are used, secured to the 15m platform crossbeam at four points for sling-lifting.

[0133] Worker positioning: When cutting the diagonal brace, the workers will be positioned on the articulated boom lift. When cutting the second main column, the workers will be positioned on the 5m maintenance platform. After the cutting is completed, the workers will evacuate from the original staircase.

[0134] Construction steps:

[0135] 1) Using the original maintenance platform on the scaffold, pass the wire rope through the lower hole of the upper (longitudinal) beam of the movable scaffold frame and hook it.

[0136] 2) After the wire rope is under tension, personnel stand on the 10m platform to perform cutting. After cutting is completed, personnel evacuate through the original staircase.

[0137] 3) The crane operator lifts and transports the crane to a designated location for temporary relocation (disassembly).

[0138] (10) After removing the remaining part of the second main column, remove the remaining part of the diagonal column, such as Figure 14 As shown:

[0139] When dismantling the remaining part on the side of the second main column, first disassemble and remove the electrical equipment and drive motor on the drive beam, and then dismantle the main frame.

[0140] When dismantling the remaining parts on the side of the inclined column, first disassemble and dismantle the auxiliary equipment such as the drive motor, and then dismantle the main frame.

[0141] In summary, the dismantling method for a large bulk cargo ship loader disclosed in this invention, combined with a simple overall structure for the dismantling and protection device (simple and convenient to manufacture and install), and a reasonable dismantling sequence design (the ship loader body is rationally divided into sections, breaking it down into smaller parts, controlling the structural weight and dimensions of each lifting and dismantling operation within the capacity of a small truck crane, greatly reducing construction costs and ensuring safe and controllable dismantling operations), not only results in fast dismantling speed but also maintains the integrity of the large bulk cargo ship loader during the dismantling process. The stability of the structure prevents structural overturning and falls of workers from heights, significantly improving the safety of the dismantling process of large bulk cargo ship loaders. The dismantling operation is relatively simple, with low requirements for equipment and site conditions (a small truck crane can be used, suitable for most existing bulk cargo loading terminals with narrow operating spaces and strip or L-shaped structures). It is also inexpensive and can provide technical reference for similar projects of ship loader dismantling operations at terminals. The number of steps in the "ten-step dismantling and hoisting operation method" of this invention can be appropriately increased or decreased according to the structural dimensions and weight of the ship loader and the actual site conditions, making it highly promising for application.

[0142] Those skilled in the art should understand that variations can be implemented by combining existing technology with the above embodiments, which will not be elaborated here. Such variations do not affect the essence of the present invention, and will not be elaborated here either.

[0143] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and the devices and structures not described in detail should be understood as being implemented in a conventional manner in the art. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention using the methods and techniques disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the present invention. This does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the present invention's technical solutions still fall within the protection scope of the present invention.

Claims

1. A method for dismantling a large bulk cargo ship loader, wherein the main structure of the large bulk cargo ship loader includes two first main columns, two second main columns, and two inclined columns. The second main columns are generally of a broken-line structure, including an upper second main column and a lower second main column connected to each other. The free end of the lower second main column is in contact with the ground, the free end of the upper second main column is connected to one end of the first main column, and the other end of the first main column is in contact with the ground. The two ends of the inclined columns are respectively connected to the first main column, the upper second main column, and the lower second main column. The first main columns, the inclined columns, and the upper second main columns together form a triangular structure. The large bulk cargo ship loader has a platform at a height of 15m and a platform at a height of 5m. The method is characterized by: The steps are as follows: (1) Install a large bulk ship loader dismantling protection device on the bulk ship loader. The large bulk ship loader dismantling protection device includes a temporary support for the movable belt trolley, a temporary support for the first main column, and temporary supports for the second main column and inclined columns. The temporary support for the movable belt trolley is used to provide temporary support for the movable belt trolley. It is arranged on the side of the ship loader where the movable belt trolley is arranged. It is located below the movable belt trolley and the temporary support for the movable belt trolley is fixedly connected to the main beam on the wheel rail of the ship loader. The temporary support for the first main column is used to provide temporary support for the first main column. Each first main column... The column is equipped with two temporary supports for the first main column. The two ends of the temporary supports for the first main column are connected to the first main column and the main beam of the computer room platform, respectively. The two temporary supports for the first main column provide triangular support for the first main column. The temporary supports for the second main column and the inclined column are used to provide temporary support for the second main column and the inclined column. The temporary supports for the second main column and the inclined column are located below the lower second main column and the inclined column. The upper end of the temporary supports for the second main column and the inclined column is connected to the lower second main column and the inclined column, and the lower end is in contact with the ground, thereby providing temporary support for the lower second main column and the inclined column. (2) Lay the movable belt rack flat; (3) Dismantle the machine room and driver's cab; (4) Divide the movable belt conveyor into two sections and remove the section of the movable belt conveyor away from the main structure; (5) Demolish the structure above the 15m platform, including the upper part of the second main column; (6) Remove the first main column; (7) Dismantle the 15m platform; (8) Remove the remaining section of the movable belt conveyor; (9) Remove the portion above the 5m platform, including the upper part of the inclined column; (10) Remove the remaining part of the second main column; (11) Remove the remaining part of the inclined column.

2. The method for dismantling a large bulk cargo ship loader according to claim 1, characterized in that, The temporary support for the movable belt-driven vehicle includes a first gantry frame arranged perpendicular to the ground; The first portal frame includes an upper crossbeam I, a lower crossbeam I, and two columns I connecting the upper crossbeam I and the lower crossbeam I. The first portal frame is provided with an internal support I for strengthening the structure of the first portal frame. The lower crossbeam I is in contact with and parallel to the ground. Each column I is connected to a side brace I and a horizontally arranged support I. The side brace I is welded to the upper wall of the main beam on the ship loader wheel rail, and the horizontally arranged support I is welded to the side wall of the main beam on the ship loader wheel rail.

3. The method for dismantling a large bulk cargo ship loader according to claim 2, characterized in that, The large bulk cargo ship loader dismantling protection device also includes two structural support members located above the temporary support of the first main column. One end of the structural support member is connected to the first main column, and the other end is connected to the upper second main column. The connection between the structural support member and the first main column is higher than the connection between the temporary support of the first main column and the first main column. The decomposition point of the first main column is located between the connection between the structural support and the first main column and the connection between the temporary support of the first main column and the first main column.

4. The method for dismantling a large bulk cargo ship loader according to claim 3, characterized in that, The temporary supports for the second main column and inclined column include a second portal frame arranged perpendicular to the ground; The second portal frame includes an upper crossbeam II, a lower crossbeam II, and two columns II connecting the upper crossbeam II and the lower crossbeam II. The second portal frame is provided with internal supports II for strengthening the structure of the second portal frame. The lower crossbeam II is in contact with and parallel to the ground. The tops of the two columns II are welded to the inclined columns. Each column II is connected to a horizontally arranged support II and a side brace II. The horizontally arranged support II is welded to the side wall of the main beam on the ship loader wheel rail. The side brace II is welded to the lower second main column. The side brace II and the lower second main column are also provided with a crossbeam III connecting the two side supports II.

5. The method for dismantling a large bulk cargo ship loader according to claim 4, characterized in that, The specific operation of step (1) is as follows: (1.1) The temporary support of the hoisting mobile belt frame vehicle makes the first gantry frame perpendicular to the ground, and welds the side support I and the horizontally arranged support I to the main beam on the wheel rail of the ship loader into one piece; (1.2) After using a hand chain hoist to lift the temporary support of the first main column to the designated position, weld the two ends of the temporary support of the first main column to the main beam of the computer room platform and the first main column respectively; (1.3) After using a hand chain hoist to lift the structural support to the designated position, weld both ends of the structural support to the upper second main column and the first main column respectively; (1.4) After using a hand-operated hoist to lift the second gantry frame to the designated position, weld the top of column II to the inclined column, weld the side support II to the lower second main column, and weld the horizontally arranged support II to the upper beam of the ship loader wheel rail.

6. The method for dismantling a large bulk cargo ship loader according to claim 1, characterized in that, Step (2) of leveling the movable belt trolley refers to using a crane to lift the movable belt trolley, cutting the wire rope connecting the movable belt trolley to the bulk material loader, and then controlling the crane to level the movable belt trolley.

7. The method for dismantling a large bulk cargo ship loader according to claim 1, characterized in that, The demolition mentioned in steps (3) to (11) refers to cutting the section to be demolished after fixing it on the crane, and then using the crane to lift the section to be demolished to the designated position.

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