CN109761141B - Steel box girder transferring auxiliary device and operation method - Google Patents
Steel box girder transferring auxiliary device and operation method Download PDFInfo
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- CN109761141B CN109761141B CN201910224066.1A CN201910224066A CN109761141B CN 109761141 B CN109761141 B CN 109761141B CN 201910224066 A CN201910224066 A CN 201910224066A CN 109761141 B CN109761141 B CN 109761141B
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Abstract
The invention discloses a steel box girder transferring auxiliary device and an operation method, wherein the device comprises a variable-section H-shaped steel girder, a lifting hook and a lifting lug; the upper flange plate of the variable-section H-shaped steel beam is horizontally arranged, the lower flange plate is arranged in three sections and is of an open U-shaped structure, the lower flange plate of the middle section is horizontally arranged and is positioned at the center of the lower flange plate, the distance between the left lower flange plate and the right lower flange plate and the upper flange plate is gradually reduced along the directions of the two ends of the upper flange plate, and a web plate is arranged between the upper flange plate and the lower flange plate and used for connecting the upper flange plate and the lower flange plate; the lifting hook is arranged below the middle section of the lower flange plate; the two lifting lugs are arranged on the upper surface of the upper flange plate of the variable-section H-shaped steel beam, and the distance between each lifting lug and one end of the adjacent upper flange plate is equal. The device is simple in installation, low in cost and high in utilization rate, and can effectively solve the problem that the steel box girder cannot be transported due to narrow space of a factory building channel.
Description
Technical Field
The invention belongs to the technical field of building steel structures, and particularly relates to a steel box girder transferring auxiliary device and an operation method.
Background
The ultra-long ultra-wide steel box girder has the advantages of large section, thick plate and high weld quality requirement, so that the factory production is selected, the factory production equipment is complete, the process from blanking to pre-assembly can be integrated, the efficiency is high, and the quality detail is easy to control. After the steel box girder assembly is completed in the factory building, the two sides of the factory building are provided with the equipment production line area, the raw material stacking area, the blanking area, the assembly area, the welding area, the finished product stacking area and the like. The steel box girder processing factory building is shown in fig. 1, the whole factory building is a large rectangle, the left rectangle and the right rectangle are areas of a device production line area, a raw material stacking area, a blanking area, an assembly area, a welding area, a finished product stacking area and the like which are arranged in the factory building, a longitudinal channel is a channel with the width of only 4 meters, and a transverse channel is an accessible channel with the width of 10 meters. The factory building originally is provided with 3-4 bridge cranes along the longitudinal channel, and the steel box girders with the width of more than 4 meters cannot be transported and delivered by adopting loading trucks. For this situation, a device is needed to transfer the ultra-long and ultra-wide steel box girder from the longitudinal direction of the plant to the transverse channel of the plant and to transfer the steel box girder out of the plant from the side door of the plant.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the steel box girder transferring auxiliary device which is simple to install, low in cost and high in utilization rate and can effectively solve the problem that the steel box girders cannot be transferred due to narrow space of a factory building channel and an operation method.
The technical scheme of the invention is realized as follows:
the steel box girder transferring auxiliary device comprises a variable-section H-shaped steel girder, a lifting hook and a lifting lug; the upper flange plate of the variable-section H-shaped steel beam is horizontally arranged, the lower flange plate is arranged in three sections and is of an open U-shaped structure, the lower flange plate of the middle section is horizontally arranged and is positioned at the center of the lower flange plate, the distance between the left lower flange plate and the right lower flange plate and the upper flange plate is gradually reduced along the directions of the two ends of the upper flange plate, and a web plate is arranged between the upper flange plate and the lower flange plate and used for connecting the upper flange plate and the lower flange plate; the lifting hook is arranged below the middle section of the lower flange plate; the two lifting lugs are arranged on the upper surface of the upper flange plate of the variable-section H-shaped steel beam, and the distance between each lifting lug and one end of the adjacent upper flange plate is equal.
Further, the lifting hook is arranged below the middle section of the lower flange plate through a U-shaped steel plate; the U-shaped steel plate comprises a bottom plate and two vertical plates, the upper ends of the two vertical plates are fixedly connected with the lower surface of the middle section of the lower flange plate of the variable-section H-shaped steel beam, rectangular holes are respectively formed in the lower parts of the two vertical plates, the size of each rectangular hole corresponds to the size of the section of the bottom plate, and the two ends of the bottom plate respectively penetrate through the rectangular holes in the two vertical plates and are respectively fixedly connected with the vertical plates.
The center of the bottom plate of the U-shaped steel plate is provided with a round hole, the lifting hook is composed of a straight section and a hook section, the straight section is provided with a pin shaft hole, the tail end of the straight section is provided with threads, the straight section of the lifting hook penetrates through the round hole on the bottom plate of the U-shaped steel plate from bottom to top, and the pin shaft penetrates through the corresponding pin shaft hole and is fixedly connected with the threads at the tail end of the straight section of the lifting hook through threaded fasteners in a matched mode.
Further, the outer sides of the two vertical plates are respectively provided with a rectangular stiffening plate, one side of each stiffening plate is fixedly connected with the outer side of the corresponding vertical plate, and the opposite side of one side of each stiffening plate is fixedly connected with the lower surface of the lower flange plate of the variable-section H-shaped steel beam.
The two sides of the web plate of the variable-section H-shaped steel beam corresponding to each vertical plate are respectively provided with a reinforcing vertical plate I, the reinforcing vertical plates I are vertically arranged and located on the same plane with the corresponding vertical plates, one side of each reinforcing vertical plate I is fixedly connected with the web plate of the variable-section H-shaped steel beam, and the adjacent two sides of each reinforcing vertical plate I are respectively fixedly connected with the upper flange plate and the lower flange plate of the variable-section H-shaped steel beam.
Further, each lifting lug is formed by two vertical plates and a middle plate, is H-shaped, and the two vertical plates are vertically welded on the upper surface of the upper flange plate of the variable-section H-shaped steel beam and are vertical to the web plate of the variable-section H-shaped steel beam; the middle plate is vertically arranged between the two vertical plates and is vertical to the two vertical plates, the lower end of the middle plate is fixedly connected with the upper flange plate of the variable-section H-shaped steel beam, and the middle plate and the web plate of the variable-section H-shaped steel beam are positioned on the same plane; a hole is arranged in the center of the middle plate.
Further, two vertical plates of each lifting lug are respectively provided with a reinforcing vertical plate II on two sides of a web plate of the variable-section H-shaped steel beam, the reinforcing vertical plates II are vertically arranged and located on the same plane with the vertical plates of the corresponding lifting lugs, one side of each reinforcing vertical plate II is fixedly connected with the web plate of the variable-section H-shaped steel beam, and two adjacent sides are respectively fixedly connected with the upper flange plate and the lower flange plate of the variable-section H-shaped steel beam.
Further, the two sides of the web corresponding to the middle section of the variable-section H-shaped steel beam lower flange plate, the two sides of the web corresponding to the left and right sections of the variable-section H-shaped steel beam lower flange plate and the two sides of the web corresponding to the left and right sections of the variable-section H-shaped steel beam lower flange plate are respectively provided with a reinforcing vertical plate III, the reinforcing vertical plate III is vertically arranged, one side of the reinforcing vertical plate III is fixedly connected with the web of the variable-section H-shaped steel beam, and the adjacent two sides of the reinforcing vertical plate III are respectively fixedly connected with the upper flange plate and the lower flange plate of the variable-section H-shaped steel beam.
Further, the distance between each lifting lug and one end of the adjacent variable-section H-shaped steel beam upper flange plate is one fourth of the total length of the variable-section H-shaped steel beam upper flange plate.
The steel box girder transferring operation method utilizes the steel box girder transferring auxiliary device to transfer, and specifically comprises the following steps:
(1) Four hanging rings are arranged on the upper flange plate of the steel box girder, the four hanging rings form a rectangle, the four hanging rings are located at four vertexes of the rectangle, four sides of the rectangle are parallel to the corresponding sides of the upper flange plate of the steel box girder, the distances between the four hanging rings and the four vertexes of the steel box girder are equal, and the hanging hooks are connected with all the hanging rings through steel wire ropes;
(2) The lifting hooks and lifting lugs of the two bridge cranes are connected through the steel wire ropes, after the bridge cranes are started to lift the steel box girders to a certain height, the two cranes keep the same lifting speed and the same height and slowly move to a transverse passage of the factory building along the longitudinal direction of the factory building, and in the lifting process, the horizontal included angle between the steel wire rope between each lifting ring and the lifting hook and the upper flange plate of the steel box girders is smaller than or equal to 60 degrees;
(3) When the bridge cranes move to the transverse passage along the longitudinal passage direction, the two bridge cranes slowly descend at the same time, the steel box girders are lifted to a pallet of the loading truck which is pre-parked on the transverse passage, and finally the loading truck is transported out of the factory building from the side door of the factory building in a straight running mode.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention ensures the integral manufacture of the steel box girder, then transfers the steel box girder to the transverse channel of the factory building from the upper part of the equipment production line area, the raw material stacking area, the blanking area, the assembly area, the welding area, the finished product stacking area and the like through the original bridge crane of the factory building, and then transfers the steel box girder out of the side door of the factory building through the loading truck, thereby avoiding the problem of sectional manufacture caused by the limitation of the transportation channel in the factory building, reducing the assembly process, saving working procedures, and improving the working efficiency and the product quality.
2. The device has the advantages of less material consumption, high utilization rate, low cost and obvious economic benefit.
Drawings
FIG. 1-Steel Box girder processing plant layout
FIG. 2-schematic structural diagram of the present invention.
FIG. 3-schematic view of the usage status structure of the present invention.
Wherein: 1-a variable-section H-shaped steel beam; 2-lifting hooks; 3-pin shafts; 4-lifting lugs; 5-upper flange plates; 6-a lower flange plate; 7-a web; 8-vertical plates; 9-a bottom plate; 10-stiffening plates; 11-reinforcing vertical plates I; 12-nut; 13-risers; 14-an intermediate plate; 15-reinforcing vertical plates II; 16-reinforcing riser III; 17-steel box girders; 18-hanging rings; 19-bridge crane hook.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
Referring to fig. 2 and 3, the steel box girder transferring auxiliary device comprises a variable section H-shaped steel girder 1, a lifting hook 2 and a lifting lug 4; the upper flange plate 5 of the variable-section H-shaped steel beam is horizontally arranged, the lower flange plate 6 is arranged in three sections and is of an open U-shaped structure, the lower flange plate 6 of the middle section is horizontally arranged and is positioned at the center of the lower flange plate 6, the distance between the left lower flange plate 6 and the right lower flange plate 6 and the upper flange plate 5 is gradually reduced along the directions of the two ends of the upper flange plate 5, and a web 7 is arranged between the upper flange plate 5 and the lower flange plate 6 and used for connecting the upper flange plate 5 and the lower flange plate 6; the lifting hook 2 is arranged below the middle section of the lower flange plate 6; the number of the lifting lugs 4 is two, the lifting lugs are arranged on the upper surface of the upper flange plate 5 of the variable-section H-shaped steel beam 1, and the distance between each lifting lug 4 and one end of the adjacent upper flange plate 5 is equal.
The lifting hook 2 is arranged below the middle section of the lower flange plate 6 through a U-shaped steel plate; the U-shaped steel plate comprises a bottom plate 9 and two vertical plates 8, the upper ends of the two vertical plates 8 are welded and fixed with the lower surface of the middle section of the lower flange plate 6 of the variable-section H-shaped steel beam 1, rectangular holes are respectively formed in the lower parts of the two vertical plates 8, the size of each rectangular hole corresponds to the size of the section of the bottom plate 9, and two ends of the bottom plate 9 penetrate through the rectangular holes of the two vertical plates respectively and are welded and fixed with the vertical plates respectively. The two vertical plates are perpendicular to the web plate and are positioned in the middle of the lower surface of the middle section so as to ensure the stress balance.
The lifting hook is frequently impacted in the operation process, so that the lifting hook is formed by forging high-quality carbon steel with good toughness at one time, seams are avoided, cracks, deformation and the like are generated when the lifting hook is stressed, and the safety of lifting operation is ensured.
The center of the bottom plate 9 of the U-shaped steel plate is provided with a round hole, the lifting hook 2 is composed of a straight section and a hook section, the straight section is provided with a pin hole, the tail end of the straight section is provided with threads, the straight section of the lifting hook 2 passes through the round hole on the bottom plate 9 of the U-shaped steel plate from bottom to top, the pin shaft 3 passes through the corresponding pin hole, and the lifting hook is fixedly connected with the thread fit at the tail end of the straight section of the lifting hook 2 by a nut 12, so that the lifting hook is prevented from sliding from the round hole of the bottom plate.
The pin shaft is a standardized fastener, can be fixedly connected in a static state and can also relatively move with a connected piece, and is mainly used for the hinge joint of two parts to form hinge connection. The pin shaft is usually locked by a cotter pin, so that the pin shaft is reliable in work and convenient to detach.
The outer sides of the two vertical plates 8 are respectively provided with a rectangular stiffening plate 10, one side of each stiffening plate 10 is fixedly connected with the outer side of the corresponding vertical plate 8, and the opposite side of one side of each stiffening plate 10 is welded with the lower surface of the lower flange plate 6 of the variable-section H-shaped steel beam 1. The stiffening plate is arranged here to prevent the vertical plate from deforming and being damaged due to overlarge stress.
The two sides of the web 7 of the variable-section H-shaped steel beam 1 corresponding to each vertical plate 8 are respectively provided with a reinforcing vertical plate I11, the reinforcing vertical plates I11 are vertically arranged and located on the same plane with the corresponding vertical plates 8, one side of each reinforcing vertical plate I11 is welded and fixed with the web 7 of the variable-section H-shaped steel beam 1, and the adjacent two sides are welded and fixed with the upper flange plate and the lower flange plate of the variable-section H-shaped steel beam 1 respectively. The reinforcing vertical plate I is mainly used for preventing the lower flange plate corresponding to the vertical plate from being deformed and damaged due to overlarge stress.
Each lifting lug 4 is formed by two vertical plates 13 and a middle plate 14, is H-shaped, and the two vertical plates 13 are vertically welded on the upper surface of the upper flange plate 5 of the variable-section H-shaped steel beam 1 and are vertical to the web 7 of the variable-section H-shaped steel beam 1; the middle plate 14 is vertically arranged between the two vertical plates 13 and is perpendicular to the two vertical plates 13, the lower end of the middle plate 14 is welded and fixed with the upper flange plate 5 of the variable-section H-shaped steel beam 1, and the middle plate 14 and the web 7 of the variable-section H-shaped steel beam 1 are positioned on the same plane; a hole is arranged in the center of the middle plate 14, so that a factory bridge crane lifting hook 19 can penetrate through the hole conveniently; the upper end of the middle plate is arc-shaped, thus meeting the requirements of the building industry and improving the safety to a certain extent.
The two vertical plates 13 of each lifting lug 4 are respectively provided with a reinforcing vertical plate II 15 on two sides of the web 7 of the variable-section H-shaped steel beam 1, the reinforcing vertical plates II 15 are vertically arranged and are positioned on the same plane with the vertical plates of the corresponding lifting lugs, one side of each reinforcing vertical plate II 15 is fixedly connected with the web of the variable-section H-shaped steel beam, and the adjacent two sides are respectively welded and fixed with the upper flange plate and the lower flange plate of the variable-section H-shaped steel beam. The reinforcing vertical plate II can effectively prevent the upper flange plate at the positions from being deformed and damaged due to overlarge stress.
The two sides of the web corresponding to the middle section of the variable-section H-shaped steel beam lower flange plate, the two sides of the web corresponding to the left and right sections of the variable-section H-shaped steel beam lower flange plate and the two sides of the web corresponding to the left and right sections of the variable-section H-shaped steel beam lower flange plate are respectively provided with a reinforcing vertical plate III 16, the reinforcing vertical plate III 16 is vertically arranged, one side of the reinforcing vertical plate III is fixedly connected with the web of the variable-section H-shaped steel beam, and the adjacent two sides are respectively welded and fixed with the upper flange plate and the lower flange plate of the variable-section H-shaped steel beam. If the length of the middle section of the lower flange plate of the variable-section H-shaped steel beam is longer, a plurality of reinforcing vertical plates III can be uniformly arranged on two sides of the corresponding web plate. The two sides of the web corresponding to the left section and the right section of the variable-section H-shaped steel beam lower flange plate, which are close to one end of the middle section of the variable-section H-shaped steel beam lower flange plate, are respectively provided with a reinforcing vertical plate III, and simultaneously a plurality of reinforcing vertical plates III can be uniformly arranged on the two sides of the web corresponding to the left section and the right section of the variable-section H-shaped steel beam lower flange plate according to the length of the web. The reinforcing vertical plate III can effectively prevent the parts from being deformed and damaged due to overlarge stress.
The distance between each lifting lug 4 and one end of the adjacent variable-section H-shaped steel beam upper flange plate is one quarter of the total length of the variable-section H-shaped steel beam upper flange plate.
The steel box girder transferring operation method utilizes the steel box girder transferring auxiliary device to transfer, and specifically comprises the following steps:
(1) Four hanging rings 18 are arranged on the upper flange plate of the steel box girder, the four hanging rings form a rectangle, the four hanging rings are positioned at four vertexes of the rectangle, four sides of the rectangle are parallel to the corresponding sides of the upper flange plate of the steel box girder, the distances between the four hanging rings and the four vertexes of the steel box girder are equal, and the hanging hooks are connected with all the hanging rings through steel wire ropes;
(2) The lifting hooks and lifting lugs of the two bridge cranes are connected through the steel wire ropes, after the bridge cranes are started to lift the steel box girders to a certain height, the two cranes keep the same lifting speed and the same height and slowly move to a transverse passage of the factory building along the longitudinal direction of the factory building, and in the lifting process, the horizontal included angle between the steel wire rope between each lifting ring and the lifting hook and the upper flange plate of the steel box girders is smaller than or equal to 60 degrees;
(3) When the bridge cranes move to the transverse passage along the longitudinal passage direction, the two bridge cranes slowly descend at the same time, the steel box girders are lifted to a pallet of the loading truck which is pre-parked on the transverse passage, and finally the loading truck is transported out of the factory building from the side door of the factory building in a straight running mode.
The steel box girder transferring auxiliary device can be manufactured and assembled in a factory by self after being subjected to strict structural design calculation, can be used after being subjected to a strict test hanging test, and meanwhile, the lifting hook is formed by forging, so that the problem of joints is avoided, the lifting hook is connected with the variable-section H-shaped steel girder through the pin shaft, and the lifting hook can be detached, maintained, replaced and the like regularly, so that potential safety hazards can be found in time, and the safety operability is improved.
Finally, it should be noted that the above-mentioned examples of the present invention are only illustrative of the present invention and are not limiting of the embodiments of the present invention. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. Not all embodiments are exhaustive. Obvious changes and modifications which are extended by the technical proposal of the invention are still within the protection scope of the invention.
Claims (7)
1. The steel box girder transferring operation method is characterized by comprising the step of transferring by utilizing a steel box girder transferring auxiliary device, wherein the steel box girder transferring auxiliary device comprises a variable-section H-shaped steel girder, a lifting hook and a lifting lug; the upper flange plate of the variable-section H-shaped steel beam is horizontally arranged, the lower flange plate is arranged in three sections and is of an open U-shaped structure, the lower flange plate of the middle section is horizontally arranged and is positioned at the center of the lower flange plate, the distance between the left lower flange plate and the right lower flange plate and the upper flange plate is gradually reduced along the directions of the two ends of the upper flange plate, and a web plate is arranged between the upper flange plate and the lower flange plate and used for connecting the upper flange plate and the lower flange plate; the lifting hook is arranged below the middle section of the lower flange plate; the two lifting lugs are arranged on the upper surface of the upper flange plate of the variable-section H-shaped steel beam, and the distance between each lifting lug and one end of the adjacent upper flange plate is equal; the method specifically comprises the following steps:
(1) Four hanging rings are arranged on the upper flange plate of the steel box girder, the four hanging rings form a rectangle, the four hanging rings are located at four vertexes of the rectangle, four sides of the rectangle are parallel to the corresponding sides of the upper flange plate of the steel box girder, the distances between the four hanging rings and the four vertexes of the steel box girder are equal, and the hanging hooks are connected with all the hanging rings through steel wire ropes;
(2) The lifting hooks and lifting lugs of the two bridge cranes are connected through the steel wire ropes, after the bridge cranes are started to lift the steel box girders to a certain height, the two cranes keep the same lifting speed and the same height and slowly move to a transverse passage of the factory building along the longitudinal direction of the factory building, and in the lifting process, the horizontal included angle between the steel wire rope between each lifting ring and the lifting hook and the upper flange plate of the steel box girders is smaller than or equal to 60 degrees;
(3) When the bridge cranes move to the transverse passage along the longitudinal passage direction, the two bridge cranes slowly descend at the same time, the steel box girders are lifted to a pallet of the loading truck which is pre-parked on the transverse passage, and finally the loading truck is transported out of the factory building from the side door of the factory building in a straight running mode.
2. The steel box girder transferring operation method according to claim 1, wherein the lifting hook is arranged below the middle section of the lower flange plate through a U-shaped steel plate; the U-shaped steel plate consists of a bottom plate and two vertical plates, the upper ends of the two vertical plates are fixedly connected with the lower surface of the middle section of the lower flange plate of the variable-section H-shaped steel beam, rectangular holes are respectively formed in the lower parts of the two vertical plates, the size of each rectangular hole corresponds to the size of the section of the bottom plate, and the two ends of the bottom plate respectively penetrate through the rectangular holes in the two vertical plates and are respectively fixedly connected with the vertical plates;
the center of the bottom plate of the U-shaped steel plate is provided with a round hole, the lifting hook is composed of a straight section and a hook section, the straight section is provided with a pin shaft hole, the tail end of the straight section is provided with threads, the straight section of the lifting hook penetrates through the round hole on the bottom plate of the U-shaped steel plate from bottom to top, and the pin shaft penetrates through the corresponding pin shaft hole and is fixedly connected with the threads at the tail end of the straight section of the lifting hook through threaded fasteners in a matched mode.
3. The steel box girder transferring operation method according to claim 2, wherein the outer sides of the two vertical plates are respectively provided with a rectangular stiffening plate, one side of each stiffening plate is fixedly connected with the outer side of the corresponding vertical plate, and the opposite side of one side of each stiffening plate is fixedly connected with the lower surface of the lower flange plate of the variable-section H-shaped steel girder;
the two sides of the web plate of the variable-section H-shaped steel beam corresponding to each vertical plate are respectively provided with a reinforcing vertical plate I, the reinforcing vertical plates I are vertically arranged and located on the same plane with the corresponding vertical plates, one side of each reinforcing vertical plate I is fixedly connected with the web plate of the variable-section H-shaped steel beam, and the adjacent two sides of each reinforcing vertical plate I are respectively fixedly connected with the upper flange plate and the lower flange plate of the variable-section H-shaped steel beam.
4. The steel box girder transferring operation method according to claim 1, wherein each lifting lug is formed by two vertical plates and a middle plate, is H-shaped, and the two vertical plates are vertically welded on the upper surface of the upper flange plate of the variable-section H-shaped steel girder and are vertical to the web plate of the variable-section H-shaped steel girder; the middle plate is vertically arranged between the two vertical plates and is vertical to the two vertical plates, the lower end of the middle plate is fixedly connected with the upper flange plate of the variable-section H-shaped steel beam, and the middle plate and the web plate of the variable-section H-shaped steel beam are positioned on the same plane; a hole is arranged in the center of the middle plate.
5. The steel box girder transferring operation method according to claim 4, wherein two vertical plates of each lifting lug are respectively provided with a reinforcing vertical plate II on two sides of a web plate of the variable-section H-shaped girder, the reinforcing vertical plates II are vertically arranged and located on the same plane with the vertical plates of the corresponding lifting lugs, one side of each reinforcing vertical plate II is fixedly connected with the web plate of the variable-section H-shaped girder, and two adjacent sides are respectively fixedly connected with an upper flange plate and a lower flange plate of the variable-section H-shaped girder.
6. The steel box girder transferring operation method according to claim 1, wherein reinforcing vertical plates III are arranged on two sides of corresponding webs of the middle section of the lower flange plate of the variable-section H-shaped steel girder, two sides of corresponding webs of the left and right sections of the lower flange plate of the variable-section H-shaped steel girder and two sides of corresponding webs of the left and right sections of the lower flange plate of the variable-section H-shaped steel girder, one side of each reinforcing vertical plate III is fixedly connected with the web of the variable-section H-shaped steel girder, and two adjacent sides are respectively fixedly connected with the upper flange plate and the lower flange plate of the variable-section H-shaped steel girder.
7. The method of claim 1, wherein each lifting lug is spaced from one end of an adjacent upper flange plate of the variable section H-beam by a distance that is one quarter of the total length of the upper flange plate of the variable section H-beam.
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| CN111877167B (en) * | 2020-07-16 | 2022-03-22 | 中国一冶集团有限公司 | Installation and construction method for curved variable cross-section fish-bellied steel box girder arc-shaped bottom plate |
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