Large plate girder turnover tool and turnover method

Abstract

The application discloses a large plate girder overturning tool and overturning method, and solves the problems of large safety hidden danger and time-consuming and laborious overturning operation in Osaka girder overturning. A U-shaped bracket is made of steel plates on site, the U-shaped aperture of the U-shaped bracket is equal to the thickness of the flange plate of the large plate girder, after five steel plates are assembled and welded, a U-shaped groove is formed on the outer vertical surface of the U-shaped bracket; three pin shafts are respectively fixed and welded in the U-shaped groove; the two prepared U-shaped brackets are symmetrically sleeved on the lower flange of the I-shaped large plate girder, the end of the main crane steel wire rope on the left side in the air is fixed on the pin shaft of the right U-shaped bracket after passing through the outer side and the left side of the upper flange of the I-shaped large plate girder, the end of the auxiliary crane steel wire rope on the right side in the air is fixed on the pin shaft of the left U-shaped bracket after passing through the right U-shaped bracket, and the large plate girder is overturned through the cooperation of the lifting of the main crane and the auxiliary crane.

Description

Technical Field

[0001] This invention relates to a hoisting fixture, and more particularly to a hoisting and turning fixture and method for large plate beams. Background Technology

[0002] Large steel plate girders are major steel structure components in power plant boiler rooms. In a 600MW pulverized coal boiler room, the weight of a large steel plate girder typically ranges from 100 to 300 tons, and the girder is in the form of an I-beam. During on-site fabrication and hoisting into place, the large steel plate girder needs to be rotated 90 degrees, a process commonly known as "turning over." Current technology involves using wire ropes to wind around the girder, adjusting the tension on the wire ropes, and employing shackles and back-locking mechanisms, along with high-altitude hoisting equipment, to turn the large steel plate girder. During the overturning of the beam, when the wire rope comes into contact with and rubs against the edge of the large plate beam, the localized stress on the wire rope causes it to bend and deform, resulting in wire breakage. Although measures such as padding the wire rope with corner protectors are taken on site, it is still impossible to avoid frequent wire breakage. Broken wires reduce the load-bearing capacity of the wire rope and pose a significant safety hazard. In particular, when the large plate beam needs to be frequently overturned on site, this overturning method also has the problems of complex overturning and positioning, and is time-consuming and labor-intensive. Summary of the Invention

[0003] This invention provides a large plate beam flipping fixture and flipping method, which solves the technical problems of large safety hazards and time-consuming and labor-intensive flipping operations in large plate beam flipping.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] The overall concept of this invention is as follows: Based on the thickness of the flange of the large plate beam, a U-shaped bracket is fabricated on-site using steel plates. The U-shaped bracket is composed of two parallel U-shaped steel plates and three steel plates welded together in the U-shaped notch. The U-shaped notch of the U-shaped bracket is 5 mm thicker than the flange of the large plate beam. After the five steel plates are assembled and welded, a U-shaped groove is formed on the outer side of the U-shaped bracket. Three pins are fixedly welded into the U-shaped groove. The two fabricated U-shaped brackets are symmetrically fitted onto the lower flange of the I-shaped large plate beam. The end of the main crane wire rope on the left side is passed through the outer side of the upper flange of the I-shaped large plate beam and the left U-shaped bracket, and then fixed to the pin on the right U-shaped bracket. The end of the auxiliary crane wire rope on the right side is passed through the right U-shaped bracket and then fixed to the pin on the left U-shaped bracket. The large plate beam is flipped by lifting with the main crane and cooperating with the auxiliary crane.

[0006] A large plate girder tilting fixture includes a main crane hook, an auxiliary crane hook, a main lifting wire rope, an auxiliary lifting wire rope, a U-shaped bracket, and an I-shaped large plate girder. The U-shaped bracket is assembled and welded from a left U-shaped steel plate, a right U-shaped steel plate, a connecting steel plate at the bottom of the U-shaped opening, a connecting steel plate on one side of the U-shaped opening, and a connecting steel plate on the other side of the U-shaped opening. The left and right U-shaped steel plates are arranged parallel to each other, with the bottom of the U-shaped opening of the left U-shaped steel plate and the bottom of the U-shaped opening of the right U-shaped steel plate connected. Between the ends, a U-shaped bottom connecting steel plate is welded. Between one side of the U-shaped opening of the left U-shaped steel plate (1) and one side of the U-shaped opening of the right U-shaped steel plate, a connecting steel plate with one side of the U-shaped opening is welded. Between the other side of the U-shaped opening of the left U-shaped steel plate and the other side of the U-shaped opening of the right U-shaped steel plate, a connecting steel plate with the other side of the U-shaped opening is welded. A pin on one side, a bottom pin, and a pin on the other side are respectively provided in the U-shaped groove on the outside of the U-shaped bracket. The lower flange of the I-shaped large plate girder is symmetrically fitted with a left U-shaped bracket and a right U-shaped bracket. One end of the main lifting wire rope is connected to the main crane hook in the air, and the other end of the main lifting wire rope passes sequentially through the upper flange of the I-shaped large plate girder, the bottom pin in the outer U-shaped groove of the left U-shaped bracket, and the side pin in the outer U-shaped groove of the left U-shaped bracket, before connecting to the side pin in the outer U-shaped groove of the right U-shaped bracket. One end of the auxiliary lifting wire rope is connected to the auxiliary crane hook in the air. The other end of the auxiliary lifting wire rope passes through a pin on one side of the outer U-shaped groove of the right U-shaped bracket and is connected to a pin on one side of the outer U-shaped groove of the left U-shaped bracket. The other end of the main lifting wire rope is fixed to a pin on one side of the outer U-shaped groove of the right U-shaped bracket, and the other end of the auxiliary lifting wire rope is fixed to a pin on one side of the outer U-shaped groove of the left U-shaped bracket. This serves to ensure that the left U-shaped bracket and the right U-shaped bracket tightly grip the lower flange during the flipping process.

[0007] Corner blocks are installed at the contact point between the upper flange plate and the main hoisting wire rope.

[0008] A method for flipping a large plate girder using a large plate girder flipping fixture, wherein the large plate girder is lying flat on the ground, a main crane hook is installed directly above the upper flange plate of the large plate girder, and an auxiliary crane hook is installed directly above the lower flange plate of the large plate girder, characterized by the following steps:

[0009] Step 1: symmetrically attach the left U-shaped bracket and the right U-shaped bracket to both ends of the lower flange plate of the horizontal I-shaped large plate beam, so that the lower flange plate is inserted into the two U-shaped grooves of the two U-shaped brackets;

[0010] The second step is to connect one end of the main hoisting wire rope to the main crane hook, and then connect the other end of the main hoisting wire rope to the lower end of the upper flange plate, the bottom pin on the left U-shaped bracket, the side pin on the left U-shaped bracket, and finally to the side pin on the right U-shaped bracket.

[0011] The third step is to connect one end of the auxiliary lifting wire rope to the hook of the auxiliary crane, and then connect the other end of the auxiliary lifting wire rope to the pin on the left U-shaped bracket after passing through the pin on one side of the right U-shaped bracket.

[0012] Step 4: Lift the main crane hook and slowly control the main crane hook to move to the right. The horizontal I-shaped large plate beam begins to flip to the right with the lower right end of the left U-shaped bracket as the fulcrum.

[0013] Step 5: When the angle between the central axis of the I-shaped large plate beam and the vertical line in the vertical direction reaches 75 degrees, control the hook of the auxiliary crane to tighten the auxiliary lifting wire rope.

[0014] Step 6: After the I-shaped large plate beam is flipped from horizontal to vertical, remove the main hoisting wire rope and the auxiliary hoisting wire rope, and remove the left and right U-shaped brackets that are attached to both ends of the lower flange plate of the horizontal I-shaped large plate beam.

[0015] This invention allows for the easy fabrication of U-shaped brackets using materials sourced on-site. The on-site operation is simple and safe, making it particularly suitable for construction sites where large beams are frequently flipped. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the I-shaped large plate beam 9 of the present invention before it is flipped.

[0017] Figure 2 This is a schematic diagram of the I-shaped large plate beam 9 of the present invention during flipping;

[0018] Figure 3 This is a schematic diagram of the structure of the I-shaped large plate beam 9 of the present invention after it has been flipped.

[0019] Figure 4 This is a schematic diagram of the structure of the invention's left U-shaped bracket 12. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings:

[0021] A large plate girder tilting fixture includes a main crane hook 14, an auxiliary crane hook 15, a main lifting wire rope 16, an auxiliary lifting wire rope 17, a U-shaped bracket, and an I-shaped large plate girder 9. The U-shaped bracket is assembled and welded from a left U-shaped steel plate 1, a right U-shaped steel plate 2, a steel plate 3 connecting the bottom of the U-shaped opening, a steel plate 4 connecting one side of the U-shaped opening, and a steel plate 5 connecting the other side of the U-shaped opening. The U-shaped bracket can be made using scrap steel plates on site. A U-shaped notch is machined in the center of the top edge of a rectangular steel plate. The width of the U-shaped notch is 5 mm greater than the thickness of the flange plate of the I-shaped large plate girder 9. The bottom corner of the rectangular steel plate is then machined into an arc shape to obtain the U-shaped support plate. The same process is repeated. Two U-shaped support plates, namely the left U-shaped steel plate 1 and the right U-shaped steel plate 2, are placed side by side in parallel. Based on the distance between the two U-shaped support plates, three longitudinal steel plates are then processed. A U-shaped bottom connecting steel plate 3 is welded between the bottom of the U-shaped opening of the left U-shaped steel plate 1 and the bottom of the U-shaped opening of the right U-shaped steel plate 2. A U-shaped side connecting steel plate 4 is welded between one side of the U-shaped opening of the left U-shaped steel plate 1 and the other side of the U-shaped opening of the right U-shaped steel plate 2. A U-shaped side connecting steel plate 5 is welded between the other side of the U-shaped opening of the left U-shaped steel plate 1 and the other side of the U-shaped opening of the right U-shaped steel plate 2. This completes the U-shaped bracket... A left U-shaped bracket 12 is formed by setting a side pin 6, a bottom pin 7, and a side pin 8 in the outer U-shaped groove. A right U-shaped bracket 13 with the same structure as the left U-shaped bracket 12 is then processed using the same method. The left U-shaped bracket 12 and the right U-shaped bracket 13 are symmetrically fitted onto the lower flange plate 11 of the horizontally lying I-beam 9. One end of the main lifting wire rope 16 is connected to the main crane hook 14 in the air. The other end of the main lifting wire rope 16 passes sequentially through the upper flange plate 10 of the I-beam 9, the bottom pin 7 in the outer U-shaped groove of the left U-shaped bracket 12, and a side pin 6 in the outer U-shaped groove of the left U-shaped bracket 12 before being connected to... The auxiliary lifting wire rope 17 is connected to the auxiliary crane hook 15 in the air. The other end of the auxiliary lifting wire rope 17 passes through the pin on one side of the outer U-shaped groove of the right U-shaped bracket 13 and is connected to the pin on one side of the outer U-shaped groove of the left U-shaped bracket 12. The other end of the main lifting wire rope 16 is fixed to the pin on one side of the outer U-shaped groove of the right U-shaped bracket 13, and the other end of the auxiliary lifting wire rope 17 is fixed to the pin on one side of the outer U-shaped groove of the left U-shaped bracket 12. This serves to make the left U-shaped bracket 12 and the right U-shaped bracket 13 tightly hug the lower flange plate 11 during the flipping process.

[0022] A corner block 18 is provided at the contact point between the upper flange plate 10 and the main lifting wire rope 16. The outer side of the corner block 18 is an arc surface, which allows the main lifting wire rope 16 to turn through the arc surface to protect the wire rope from breaking.

[0023] The method of flipping the large plate beam using a large plate beam flipping fixture: The I-shaped large plate beam 9 lies flat on the ground. A main crane hook 14 is set directly above the upper flange plate 10 of the I-shaped large plate beam 9, and an auxiliary crane hook 15 is set directly above the lower flange plate 11 of the I-shaped large plate beam 9. Since the I-shaped large plate beam 9 is relatively long, two identical flipping fixtures are set at both ends of the I-shaped large plate beam 9. The lifting steps are carried out simultaneously at both ends to flip the I-shaped large plate beam 9. The following are the flipping steps performed at one end of the I-shaped large plate beam 9. The steps performed at the other end are the same as below: First step: The left U-shaped bracket 12 and the right U-shaped bracket 13 are symmetrically fitted onto both ends of the lower flange plate 11 of the flat I-shaped large plate beam 9, so that the lower flange plate 11 is inserted into the two U-shaped grooves of the two U-shaped brackets.

[0024] The second step is to connect one end of the main hoisting wire rope 16 to the main crane hook 14, and then connect the other end of the main hoisting wire rope 16 to the lower end of the upper flange plate 10, the bottom pin 7 on the left U-shaped bracket 12, and the side pin 6 on the left U-shaped bracket 12 in sequence, and finally to the side pin on the right U-shaped bracket 13.

[0025] Third step: Connect one end of the auxiliary lifting wire rope 17 to the auxiliary crane hook 15, and connect the other end of the auxiliary lifting wire rope 17 to the pin 6 on the left U-shaped bracket 12 after passing through the pin on one side of the right U-shaped bracket 13; fix the other end of the main lifting wire rope 16 to the right U-shaped bracket 13, and fix the other end of the auxiliary lifting wire rope 17 to the left U-shaped bracket 12, so that the lifting main crane hook 14 exerts a downward or leftward pull on the right U-shaped bracket 13 through the main lifting wire rope 16, and the auxiliary crane hook 15 exerts an upward or rightward pull on the left U-shaped bracket 12 through the auxiliary lifting wire rope 17, so that the left U-shaped bracket 12 and the right U-shaped bracket 13 always hold the lower flange plate 11 tightly during the entire flipping process;

[0026] Step 4: Lift the main crane hook 14 and slowly control the main crane hook 14 to move to the right. The horizontal I-shaped large plate beam 9 begins to flip to the right with the lower right end of the left U-shaped bracket 12 as the fulcrum.

[0027] Step 5: When the angle between the central axis of the I-shaped large plate beam 9 and the vertical line reaches 75 degrees, control the auxiliary crane hook 15 to tension the auxiliary lifting wire rope 17. If the I-shaped large plate beam 9 flips and tilts to the right, the tensioned auxiliary lifting wire rope 17 will provide support. The entire lifting wire rope is in contact with the pin shaft, which protects the wire rope from being broken by the edges of the I-shaped large plate beam 9 to the greatest extent.

[0028] Step 6: After the I-shaped large plate beam 9 is flipped, that is, flipped from horizontal to vertical, remove the main hoisting wire rope 16 and the auxiliary hoisting wire rope 17, and remove the left U-shaped bracket 12 and the right U-shaped bracket 13 that are connected to both ends of the lower flange plate 11 of the horizontal I-shaped large plate beam 9.

Claims

1. A large plate girder turnover tooling comprising a main crane hook (14), an auxiliary crane hook (15), a main hoisting wire rope (16), an auxiliary hoisting wire rope (17), a U-shaped bracket, and an I-shaped large plate girder (9), characterized in that, The U-shaped bracket is composed of a left U-shaped steel plate (1), a right U-shaped steel plate (2), a U-shaped opening bottom end connecting steel plate (3), a U-shaped opening inner one side connecting steel plate (4) and a U-shaped opening inner other side connecting steel plate (5), the left U-shaped steel plate (1) and the right U-shaped steel plate (2) are arranged in parallel to each other, the U-shaped opening bottom end connecting steel plate (3) is welded and connected between the U-shaped opening inner bottom end of the left U-shaped steel plate (1) and the U-shaped opening inner bottom end of the right U-shaped steel plate (2), the U-shaped opening inner one side connecting steel plate (4) is welded and connected between the U-shaped opening inner one side of the left U-shaped steel plate (1) and the U-shaped opening inner one side of the right U-shaped steel plate (2), the U-shaped opening inner other side connecting steel plate (5) is welded and connected between the U-shaped opening inner other side of the left U-shaped steel plate (1) and the U-shaped opening inner other side of the right U-shaped steel plate (2), one side pin shaft (6), bottom pin shaft (7) and other side pin shaft (8) are arranged in the outer U-shaped groove of the U-shaped bracket respectively, the left U-shaped bracket (12) and the right U-shaped bracket (13) are symmetrically sleeved on the lower flange plate (11) of the horizontally lying I-shaped large plate beam (9), one end of the main hoisting steel wire rope (16) is connected to the main hoist hook (14) in the air, the other end of the main hoisting steel wire rope (16) is sequentially connected to the one side pin shaft in the outer U-shaped groove of the right U-shaped bracket (13) through the bottom pin shaft (7) in the outer U-shaped groove of the left U-shaped bracket (12) and the one side pin shaft (6) in the outer U-shaped groove of the left U-shaped bracket (12) in sequence after passing through the upper flange plate (10) of the I-shaped large plate beam (9), one end of the auxiliary hoisting steel wire rope (17) is connected to the auxiliary hoist hook (15) in the air, the other end of the auxiliary hoisting steel wire rope (17) is sequentially connected to the one side pin shaft (6) in the outer U-shaped groove of the left U-shaped bracket (12) through the one side pin shaft in the outer U-shaped groove of the right U-shaped bracket (13), the other end of the main hoisting steel wire rope (16) is fixed to the one side pin shaft in the outer U-shaped groove of the right U-shaped bracket (13), the other end of the auxiliary hoisting steel wire rope (17) is fixed to the one side pin shaft (6) in the outer U-shaped groove of the left U-shaped bracket (12), so that the left U-shaped bracket (12) and the right U-shaped bracket (13) tightly hold the lower flange plate (11) during the overturning process.

2. The large panel beam turnover tooling according to claim 1, wherein, A corner pad (18) is arranged at the contact position of the upper flange plate (10) and the main hoisting steel wire rope (16).

3. A method for overturning a large plate beam by using the large plate beam overturning tool according to claim 1, the I-shaped large plate beam (9) is horizontally lying on the ground, the main hoist hook (14) is arranged above the upper flange plate (10) of the I-shaped large plate beam (9), the auxiliary hoist hook (15) is arranged above the lower flange plate (11) of the I-shaped large plate beam (9), and the method is characterized by the following steps: Step 1, symmetrically sleeving the left U-shaped bracket (12) and the right U-shaped bracket (13) on both ends of the horizontally lying I-shaped large plate beam (9), so that the lower flange plate (11) is inserted into the two U-shaped grooves of the two U-shaped brackets. Second step, one end of the main hoisting steel wire rope (16) is connected to the main hoist hook (14), and the other end of the main hoisting steel wire rope (16) is connected to the side pin shaft of the right U-shaped bracket (13) after passing through the bottom pin shaft (7) of the left U-shaped bracket (12) and the side pin shaft (6) of the left U-shaped bracket (12) in turn; Third step, one end of the auxiliary hoisting steel wire rope (17) is connected to the auxiliary hoist hook (15), and the other end of the auxiliary hoisting steel wire rope (17) is connected to the side pin shaft (6) of the left U-shaped bracket (12) after passing through the side pin shaft of the right U-shaped bracket (13); Fourth step, hoist the main hoist hook (14) and control the main hoist hook (14) to move slowly to the right, and the horizontally lying I-shaped large plate beam (9) starts to overturn to the right with the right lower end of the left U-shaped bracket (12) as the fulcrum; Fifth step, when the included angle between the central axis of the I-shaped large plate beam (9) and the vertical line reaches 75 degrees, control the auxiliary hoist hook (15) to tension the auxiliary hoisting steel wire rope (17); Sixth step, after the I-shaped large plate beam (9) is overturned, that is, from the horizontal to the vertical, the main hoisting steel wire rope (16) and the auxiliary hoisting steel wire rope (17) are removed, and the left U-shaped bracket (12) and the right U-shaped bracket (13) sleeved at both ends of the lower flange plate (11) of the horizontally lying I-shaped large plate beam (9) are removed.

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