Construction method for protective demolition of 280-ton overhead crane

Abstract

The embodiment of the present invention discloses a protective demolition construction method for a 280-ton crane, comprising the following steps: demolishing the roof according to the position of the crane; demolishing the auxiliary components of the crane; before the crane is powered off, dropping the plate hook back onto the trailer, retracting all the wire ropes on the drum, pulling the wire rope heads back to the ground, cutting the wire ropes section by section, and removing the plate hooks and the cut wire ropes; slowly dropping the cab down 3 meters with a fall chain, docking it with a car crane, and finally dropping the cab to the ground; demolishing the auxiliary trolley, dismantling it and loading it onto a truck, demolishing the main trolley, dismantling it and loading it onto a truck, demolishing the auxiliary beam and end beam, dismantling it and loading it onto a truck, and then demolishing the main beam, dismantling it and loading it onto a truck. After the trolley is dismantled and loaded and transported out, the main beam on one side is demolished, the main beam is hoisted with a lock, and both ends of the main beam are tied with hemp ropes. The operator adjusts the rotation posture of the main beam by using the hemp ropes so that the beam is staggered from the track, and finally the main beam is placed on the ground; the roof is restored. The present invention solves the problems encountered in the existing protective demolition of a 280-ton crane.

Description

Technical Field

[0001] The present invention relates to the field of crane demolition, and specifically to a protective demolition construction method for a 280-ton crane. Background Art

[0002] Due to the need for a new ironmaking project, a new 280-ton crane needs to be installed. Cranes of this tonnage belong to special equipment and the customized price is extremely high. In order to achieve energy conservation and emission reduction and save costs, an old crane is demolished from another factory and reinstalled after repair, which greatly saves costs.

[0003] The 280t / 80t bridge crane of the crane is a 4-beam 4-rail heavy-duty bridge crane, with two trolleys. The auxiliary trolley is below the main trolley. The clearance between the highest point of the auxiliary trolley and the lowest point of the main trolley is about 200 mm. The main beam, auxiliary beam, and end beam are all box-shaped structures, and the end beam is connected to the main and auxiliary beams entirely by high-strength bolts. The large car running wheels are connected to the main beam through vehicle pins. The self-weight of the main beam of the 280t / 80t bridge crane is 74t, the electrical equipment inside the beam weighs 14t, the large car running mechanism inside the beam weighs 10t, the heat insulation plate weighs about 1t, and including miscellaneous accessories, it totals about 125t. The main trolley weighs about 170t, and the auxiliary trolley weighs about 70t. The crane beam is composed of two main beams and two auxiliary beams, and the total weight of the entire bridge is about 315t. The total weight of the large car running mechanism is about 120t, which consists of 4 groups of load-bearing wheels. The power for driving the load-bearing wheels mainly comes from 4 motors and 4 gearbox devices. The motors are internally connected to the gear devices through a gear coupling with a brake disc. The main trolley mainly includes the chassis of two main trolleys, with wire rope pulleys with top pulleys and wire rope fixing and lifting platforms on the upper part. A lifting mechanism and a wire rope drum are installed on the platform. The running of the main trolley is mainly composed of 8 pairs of installed load-bearing wheels, and its power comes from 4 motors. The motors and the gearbox are connected through a gear coupling with a brake disc installed. The mechanical braking for the movement of the trolley is mainly carried out through a double shoe type brake. The main trolley lifting mechanism uses 2 motors to drive two wire rope drums through a planetary gear reducer and a secondary reducer. The planetary gear reducer and the motor are connected through a gear coupling with a brake disc installed, and the planetary gear reducer and the secondary reducer are connected through a universal joint shaft. The auxiliary trolley consists of a trolley frame with welded supports and a load-bearing base, and the load-bearing base is mainly provided for installing mechanical and electrical equipment. The running of the auxiliary trolley is mainly composed of 4 pairs of installed load-bearing wheels, and its power comes from 2 motors. The auxiliary trolley lifting drum is driven through a spur gear device and a motor.

[0004] During the demolition, there are the following difficulties:

[0005] (1) The construction space is narrow, and the disassembly and assembly of large equipment are difficult

[0006] The equipment demolition and the equipment stacking site are limited. For the demolition operation of the overhead crane, the overhead crane is seriously covered with dust, the single-piece volume is large, there are many uncertain factors, and the workload of disassembly and disassembly is large;

[0007] (2) The protective demolition of the 280t overhead crane is difficult. The main girder, main and auxiliary trolleys of the 280t overhead crane for protective demolition are heavy, the equipment structure is complex, there are many parts, the volume is large, the demolition workload is large, the precision requirement is high, and the hoisting difficulty is large;

[0008] (3) There are many high-altitude operations. The installation rail surface elevation of the equipment is above 30m, which belongs to high-altitude operations and is dangerous. Summary of the Invention

[0009] The embodiment of the present invention provides a construction method for the protective demolition of a 280-ton overhead crane to solve the problems encountered in the protective demolition of the existing 280-ton overhead crane.

[0010] To achieve this purpose, the embodiment of the present invention provides the following technical solutions:

[0011] The construction method for the protective demolition of a 280-ton overhead crane includes the following steps:

[0012] According to the position of the overhead crane, demolish the roof of the factory building;

[0013] Demolish the accessory components of the overhead crane;

[0014] Demolition of the plate hook and wire rope

[0015] Before the overhead crane is powered off, lower the plate hook to the trailer, unwind all the wire ropes on the drum, pull the wire rope head back to the ground, cut the wire rope section by section, and remove the plate hook and the cut wire rope;

[0016] Demolition of the cab

[0017] Fix one end of 4 5t chain hoists on the main girder of the overhead crane, and connect the other end to the four corners of the top surface of the cab. Slowly lower the cab by 3m with the chain hoist, then connect it with a truck crane, and finally lower the cab to the ground;

[0018] Demolition, disassembly and loading of the auxiliary trolley

[0019] Demolition, disassembly and loading of the main trolley

[0020] Use a 650-ton crawler crane to slowly lift the main trolley off the track, pull the main girder frame to one side, let the main trolley fall onto the steel plate placed in advance on the ground for fixing, after removing the drum and reducer of the main trolley, directly load the main trolley body and transport it outside the factory building for disassembly;

[0021] Demolition, disassembly and loading of the secondary beam and end beam

[0022] Demolition and Disassembly of Main Girder and Loading onto Trucks

[0023] After the trolley is demolished, loaded onto a truck and transported out, start demolishing one side of the main girder. The main girder is hoisted using locking devices. Both ends of the main girder are tied firmly with 20-mm hemp ropes. Ensure the balance of the girder during hoisting. When the wheels of the main girder are lifted 300 mm off the track, the operators adjust the rotation attitude of the main girder through the hemp ropes to stagger the girder from the track. Finally, use a crane to place it on the steel stools pre-placed on the ground.

[0024] Roof Restoration

[0025] Furthermore, during the cutting of the wire rope, the wire rope is in a free state. When lowering it from above, use a thin wire rope or thick hemp rope to tow the wire rope down. During the lowering process, set up a warning perimeter and an isolation area around.

[0026] Furthermore, in the step of demolishing, disassembling and loading the main trolley, when the height exceeds the height of the crane itself, use a winch to pull the main girder frame to one side.

[0027] Furthermore, after the main girder and main trolley of the crane are fixed on the ground, the operators stand on the steel structure platform to carry out the disassembly work.

[0028] Furthermore, before demolishing the roof of the factory building, first arrange the roof rain protection and safety facilities. After the crane is demolished, recycle the roof rain protection and safety facilities.

[0029] Furthermore, the main boom of the 650t crawler crane is 42 m and the auxiliary boom is 36 m; a wire rope with a diameter of 56 mm and a 50t shackle are selected for hoisting operations.

[0030] Furthermore, when carrying out the disassembly work on the ground, use a 200t truck crane to cooperate in the operation of the reducer, drum on the main trolley, the traveling wheels and the cab on the main girder.

[0031] Compared with the prior art, the beneficial effects and significant progress of the present invention are as follows:

[0032] The embodiment of the present invention realizes the demolition of a 280T crane in a narrow space, completes the demolition and hoisting with high precision, completes the protective demolition, and the parts of the demolished crane can be reinstalled to form a crane again, greatly saving costs. Brief Description of the Drawings

[0033] To more clearly illustrate the technical solutions of the present invention, the following briefly introduces the drawings required for the embodiments of the present invention.

[0034] Obviously, the accompanying drawings in the following description are only the drawings of some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, but these other drawings also fall within the scope of the drawings required for the embodiments of the present invention.

[0035] Figure 1 It is a construction schematic diagram of the present invention;

[0036] Figure 2 It is a schematic diagram before the driving device is removed;

[0037] Figure 3 It is a schematic diagram of the cab removal in an embodiment of the present invention. Detailed implementation manners

[0038] To make the objectives, technical solutions, beneficial effects and remarkable progress of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings provided in the embodiments of the present invention.

[0039] Obviously, all these described embodiments are only some embodiments of the present invention, rather than all embodiments; based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0040] It should be noted that the terms "first", "second" and "third" (if any) in the description, claims and accompanying drawings of the present invention are only used to distinguish different objects, rather than to describe a specific order. In addition, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or units inherent to these processes, methods, products or devices.

[0041] It should be understood that:

[0042] In the description of the embodiments of the present invention, the directional or positional terms such as "upper", "lower", "top", "bottom", etc. are only based on the orientation or positional relationship shown in the accompanying drawings of the embodiments of the present invention, and are for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element must have a specific orientation, specific orientation structure and operation. Therefore, it should not be construed as a limitation of the present invention.

[0043] In the present invention, unless otherwise clearly specified and defined, terms such as "installation", "connection", "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or a movable connection, or even be integrated; it may be a direct connection, an indirect connection through an intermediate medium or an invisible signal connection, or even an optical connection. It may be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined.

[0044] For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] It should also be noted that the following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in some embodiments.

[0046] Next, the technical solution of the present invention will be described in detail with specific embodiments.

[0047] Before demolition, first select a crane. On the premise of meeting the lifting requirements, comprehensively consider cost and construction period factors. The crane's standing position, type selection, and wire rope selection are the same as those during the installation of the 280t overhead crane. Use a 650t crawler crane for demolition construction, with a main boom of 42m and a jib of 36m; select a wire rope with a diameter of 56mm and a 50t shackle for hoisting operations. To ensure the safety of hoisting operations, before the crane enters the site, it is necessary to lay roadbed boxes at the standing position of the 650t crawler crane to increase the ground bearing strength. For example Figure 1 First, carry out construction preparations, such as the site, crane, steel structure platform, etc.

[0048] The embodiment of the present invention discloses a protective demolition construction method for a 280-ton overhead crane, including the following steps:

[0049] According to the position of the overhead crane, demolish the roof of the factory building; demolishing the roof facilitates hoisting. At the same time, fabricate matching lifting lugs.

[0050] Demolish the accessory components of the overhead crane, such as switch cabinets and cables, etc.;

[0051] Demolish the plate hook and wire rope

[0052] Before the overhead crane is powered off, gently lower the plate hook onto the trailer, unwind all the wire ropes on the drum, let the wire rope heads be pulled back to the ground, and then use oxyacetylene to cut the wire ropes section by section. The removed plate hooks and wire ropes should be cleared away in time;

[0053] Demolish the cab 5

[0054] Because the cab 5 is very close to the main beam 3 of the crane, it is impossible to directly lift it down with the truck crane 6. First, use four 5t fall chains 7 to fix one end to the main beam 3 of the crane, and connect the other ends to the four corners of the top surface of the cab 5. Use the fall chains 7 to slowly lower the cab 5 by 3m, then use the 200T truck crane 6 to connect it, and finally lower the cab 5 to the ground.

[0055] Auxiliary trolley 2 dismantling, disassembly and loading

[0056] Main trolley 1 dismantling, disassembly and loading

[0057] A 650-ton crawler crane was used to slowly lift the main trolley 1 off the track, and the main beam frame was pulled to one side. The main trolley was lowered to the ground and fixed on a pre-placed steel plate. After the drum and reducer of the main trolley were removed, the main trolley body was directly loaded onto a truck and transported outside the factory for dismantling.

[0058] Dismantle, dismantle and load the auxiliary beam 4 and end beam

[0059] Main beam 3 dismantling, disassembly and loading

[0060] After the trolley was dismantled and loaded, the main beam 3 on one side began to be dismantled. The main beam 3 was hoisted with a lock and tied with 20mm hemp rope at both ends to ensure the balance of the beam during hoisting. When the wheels of the main beam were lifted 300mm away from the track, the operator adjusted the rotation posture of the main beam with the hemp rope so that the beam was staggered from the track. Finally, the crane lowered the beam onto the steel bench placed in advance on the ground.

[0061] Roof restoration.

[0062] In one embodiment of the present invention, during the wire rope cutting process, the wire rope is in a free state. When lowering it from above, it is pulled down by a thin wire rope or a thick hemp rope. During the lowering process, the surrounding area is guarded and an isolation area is set up.

[0063] In one embodiment of the present invention, during the steps of dismantling, disassembling and loading the main trolley, when the height exceeds the height of the trolley itself, the main beam frame is pulled to one side by a winch.

[0064] In one embodiment of the present invention, after the main beam of the crane and the main trolley are fixed on the ground, personnel stand on the steel structure platform to perform the dismantling work.

[0065] In one embodiment of the present invention, before dismantling the roof of the factory building, rainproofing and safety facilities are first arranged. After the demolition is completed, the temporary rainproofing measures are removed and the safety facilities are retrieved. The roof tiles at the location where the roof is cut need to be replaced.

[0066] In one embodiment of the present invention, the main arm of the 650t crawler is 42m, and the auxiliary arm is 36m; a steel wire rope with a diameter of 56mm and a 50t clamp are used for lifting operations.

[0067] In an embodiment of the present invention, when carrying out the disintegration work on the ground, the speed reducer on the main trolley, the drum, the running wheels on the main beam, and the cab all use a 200t truck crane to cooperate in the operation.

[0068] During the description process of the above specification:

[0069] The descriptions of terms such as "this embodiment", "embodiment of the present invention", "as shown in...", "further", "further improved technical sub-solutions", etc. mean that the specific features, structures, materials or characteristics described in this embodiment or example are included in at least one embodiment or example of the present invention; in this specification, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example, and moreover, the specific features, structures, materials or characteristics, etc. described can be combined or combined in a suitable manner in any one or more embodiments or examples; in addition, on the premise of not generating contradictions, those of ordinary skill in the art can combine or combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0070] Finally, it should be noted that:

[0071] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them;

[0072] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. The non-essential improvements, adjustments or replacements made by those skilled in the art according to the content of this specification all fall within the scope of protection required by the present invention.

Claims

1. Construction method for protective demolition of 1,280-ton overhead crane, characterized in that, The following steps are involved: According to the driving position, the roof of the factory building is removed; Dismantle the auxiliary components of the crane; Plate hook and wire rope removal Before the vehicle is powered off, lower the plate hook back onto the trailer, unwind all the wire ropes on the drum, pull the wire rope ends back to the ground, cut the wire ropes section by section, and remove the plate hook and cut wire ropes. Cab removal Use four 5t fall chains to fix one end on the main beam of the crane and connect the other end to the four corners of the cab top surface. Use the fall chains to slowly lower the cab 3m, then use a truck crane to connect it, and finally lower the cab to the ground. Auxiliary trolley dismantling, disassembly and loading Main trolley dismantling, disassembly and loading A 650-ton crawler crane was used to slowly lift the main trolley off the track, and the main beam frame was pulled to one side. The main trolley was lowered to the ground and fixed on a pre-placed steel plate. After the drum and reducer of the main trolley were removed, the main trolley body was directly loaded onto a truck and transported outside the factory for dismantling. Dismantling, dismantling and loading of auxiliary beams and end beams Main beam removal, dismantling and loading After the trolley was dismantled and loaded onto the truck, the main beam on one side began to be dismantled. The main beam was hoisted with a lock and tied with 20mm hemp rope at both ends to ensure the balance of the beam during lifting. When the wheels of the main beam were lifted 300mm off the track, the operators used the hemp rope to adjust the rotation posture of the main beam so that the beam was staggered from the track. Finally, the crane lowered the beam onto a steel bench that had been placed on the ground in advance. Roof restoration.

2. The protective demolition construction method of the 280-ton overhead crane according to claim 1, characterized in that: During the wire rope cutting process, the wire rope is in a free state. When lowering it from above, it must be pulled down by a thin steel rope or a thick hemp rope. During the lowering process, the surrounding area must be guarded and an isolation area must be set up.

3. The protective demolition construction method of the 280-ton overhead crane according to claim 1, characterized in that: During the main trolley dismantling, disassembly and loading steps, when the height exceeds the height of the trolley itself, the main beam frame is pulled to one side by a winch.

4. The protective demolition construction method of the 280-ton overhead crane according to claim 1, characterized in that: After the main crane beam and main trolley are fixed on the ground, personnel stand on the steel structure platform to carry out dismantling work.

5. The protective demolition construction method of the 280-ton overhead crane as described in claim 1, characterized in that: Before dismantling the roof of the factory building, the roof rain protection and safety facilities should be arranged first. After the driving dismantling is completed, the roof rain protection and safety facilities should be recovered.

6. The protective demolition construction method of the 280-ton overhead crane as described in claim 1, characterized in that: The main arm of the 650t crawler is 42m and the auxiliary arm is 36m; a 56mm diameter wire rope and a 50t clamp are used for lifting operations.

7. The protective demolition construction method of the 280-ton overhead crane as described in claim 1, characterized in that: When dismantling the structure on the ground, a 200t truck crane was used to operate the reducer, drum, running wheels and cab on the main trolley.

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