Bridge construction hoisting method using the lifting spreader

Abstract

The application discloses a hoisting sling and a bridge construction hoisting method using the same. The hoisting sling comprises a sling main frame, a lifting lug assembly and at least two lifting rods. The lifting lug assembly is fixedly connected to the sling main frame. One end of each of the at least two lifting rods is connected to the sling main frame. The other end of each of the at least two lifting rods is provided with a pin joint part. The pin joint part is used for connecting a hoisted target through a shaft pin. The included angle between the two lifting rods is greater than 0 degrees and less than 180 degrees. The hoisting sling of the application can ensure construction safety. The hoisting sling and the hoisted target are connected through the pin joint part. The installation and dismounting of the hoisting sling and the hoisted target are relatively convenient. The shaft pin connection between the hoisting sling and the hoisted target can be realized by arranging temporary lifting lugs on the hoisted target. The hoisting sling can be used for different hoisted targets. The hoisting sling has high universality and can reduce the construction cost when hoisting different hoisted targets.

Description

Technical Field

[0001] The present invention relates to the technical field of construction, and in particular to a lifting device and a bridge construction lifting method using the same. Background Art

[0002] During construction, large and heavy building materials need to be hoisted. Existing hoisting methods typically use specialized fixtures. However, due to the variety of building materials used, a wide variety of fixtures are required, increasing construction costs. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a lifting sling that is easy to install and dismantle while ensuring construction safety and has strong versatility.

[0004] The present invention also aims to provide a bridge construction hoisting method.

[0005] According to an embodiment of the present invention, the lifting sling includes: a sling main frame; a lifting ear assembly, which is fixedly connected to the sling main frame; at least two slings, one end of the at least two slings is connected to the sling main frame, and the other end of each of the slings is provided with a pin connection portion, which is used to connect the sling to the target through an axle pin, and the angle between the two slings is greater than 0 degree and less than 180 degrees.

[0006] According to the lifting sling of the embodiment of the present invention, under the premise of ensuring construction safety, the lifting sling and the suspended target are connected by a pin connection part, the installation and disassembly of the two are relatively convenient, and the axial pin connection between the lifting sling and the suspended target can be achieved by setting a temporary lifting lug on the suspended target, so that the lifting sling can be used for different suspended targets, has strong versatility, and can reduce the construction cost when lifting different suspended targets.

[0007] In some embodiments, the boom comprises: a main crossbar; two reinforced inclined

[0008] Rod, the two reinforcing diagonal rods are arranged on both horizontal sides of the main cross bar, and the distance between the reinforcing diagonal rods and the main cross bar gradually increases in the direction away from the main frame of the spreader; lower support rod, the lower support rod is located below the main cross bar, and the distance between the lower support rod and the main cross bar gradually increases in the direction away from the main frame of the spreader, and the angle between the lower support rod and the main cross bar is less than or equal to 90 degrees.

[0009] Furthermore, the sling main frame includes: a sling top plate, which is horizontally arranged; two sling webs, which are vertically connected to the bottom of the sling top plate, and the two sling webs are arranged in parallel and spaced apart; two sling bottom plates, each of the sling webs is connected to the sling bottom plate on one side away from the other sling web, and the sling bottom plates are spaced apart below the sling top plate; wherein the lifting ear assembly is fixedly connected to the top of the sling top plate, one end of the main cross bar and the lower support bar are connected between the two sling webs, and the two reinforcing diagonal bars are arranged corresponding to the two sling bottom plates, and are connected between the sling bottom plate and the sling top plate.

[0010] Specifically, the spreader main frame further includes: two limiting side plates, each of the limiting side plates is connected between the spreader top plate and the spreader bottom plate, and the end of the reinforcing diagonal rod is located between the limiting side plates and the spreader web.

[0011] Specifically, the sling main frame further includes: a rib plate, which is located below the sling bottom plate and vertically connected to the sling web.

[0012] In some embodiments, the main frame of the sling is a welded part.

[0013] In some embodiments, the main cross bar includes: two opposite first channel steels, a first rod cavity is formed between the two first channel steels, and a plurality of first connecting plates are welded to the two first channel steels outside the first rod cavity, and the plurality of first connecting plates are arranged along the length direction of the main cross bar; two first closing plates, the two first closing plates are located at both ends of the first rod cavity, and the two first closing plates are respectively welded to the two first channel steels; wherein, first connecting holes are correspondingly provided on the two first channel steels, and a first reinforcing plate is welded at at least one of the first connecting holes.

[0014] Furthermore, the lower support rod includes: two opposite second channel steels, a second rod cavity is formed between the two second channel steels, and a plurality of second connecting plates are welded to the two second channel steels outside the second rod cavity.

[0015] Arranged in the length direction of the rod; two second closing plates, the two second closing plates are located at both ends of the second rod cavity, and the two second closing plates are respectively welded to the two second channel steels; wherein, second connecting holes are correspondingly provided on the two second channel steels, and a second reinforcing plate is welded to at least one of the second connecting holes.

[0016] Furthermore, the reinforcing diagonal rod is square steel, a third connecting hole is provided on the reinforcing diagonal rod, and a third reinforcing plate is welded to the third connecting hole.

[0017] According to the bridge construction hoisting method of an embodiment of the present invention, the lifting sling described in any of the above embodiments is used, and is characterized in that it includes the following steps: installing at least two groups of temporary lifting ears on the building materials to be lifted; using the lifting sling, each group of the temporary lifting ears is correspondingly connected to one lifting sling, and the pin connection part of the lifting sling is pinned to the temporary lifting ears; and pulling the lifting rope of the lifting sling.

[0018] According to the bridge construction hoisting method of the embodiment of the present invention, the connection and disassembly of the lifting device and the hoisted object are relatively simple, and the hoisting of the hoisted object is relatively simple. Moreover, the lifting device can be applied to different hoisted objects, and has good versatility.

[0019] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0021] Figure 1 This is a structural diagram of a lifting sling according to an embodiment of the present invention;

[0022] Figure 2 for Figure 1 A schematic structural diagram of a main frame of a lifting sling of an embodiment;

[0023] Figure 3 for Figure 1 A front view of a main frame of a lifting sling of an embodiment;

[0024] Figure 4 for Figure 3 A cross-sectional view along the direction indicated by line AA;

[0025] Figure 5 for Figure 1 A side view of the main crossbar of the lifting spreader of the embodiment;

[0026] Figure 6 for Figure 1 A top view of the main crossbar of the lifting spreader of the embodiment;

[0027] Figure 7 for Figure 6 A cross-sectional view along the direction indicated by line BB;

[0028] Figure 8 for Figure 1 A side view of a lower support rod of a lifting spreader of an embodiment;

[0029] Figure 9 for Figure 1A top view of a lower support rod of a lifting sling of an embodiment;

[0030] Figure 10 for Figure 9 A cross-sectional view taken along line CC;

[0031] Figure 11 for Figure 1 A side view of a reinforcement diagonal rod of a lifting sling according to an embodiment;

[0032] Figure 12 A schematic diagram of building material hoisting in a bridge construction hoisting method according to an embodiment of the present invention;

[0033] Figure 13 for Figure 12 Schematic diagram of the traction equipment setting method of the embodiment.

[0034] Reference numerals:

[0035] Lifting sling 100, sling main frame 1,

[0036] Spreader top plate 11, spreader web 12, spreader bottom plate 13, limiting side plate 14, rib plate 15, lifting ear assembly 2,

[0037] Boom 3,

[0038] Pin connection portion 31,

[0039] Main crossbar 32, first rod cavity 320, first channel steel 321, first connecting plate 322, first sealing plate 323, first connecting hole

[0040] 324, first reinforcement plate 325,

[0041] Reinforcement diagonal rod 33, third connection hole 331, third reinforcement plate 332,

[0042] Lower support rod 34, second rod cavity 340, second channel steel 341, second connecting plate 342, second sealing plate 343, second connecting hole

[0043] 344, second reinforcement plate 345,

[0044] The building material to be lifted is 200, the temporary lifting lug is 210, the lifting rope is 300,

[0045] Guide device 400, slide rail 500. DETAILED DESCRIPTION

[0046] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0047] In the description of the present invention, it is to be understood that the terms "upper", "lower",

[0048] The orientations or positional relationships indicated by terms such as "vertical," "horizontal," "top," "bottom," "inside," and "outside" are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, features specified as "second" or "secondary" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0049] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0050] The following describes the lifting device 100 and the bridge construction lifting method using the same according to an embodiment of the present invention with reference to the accompanying drawings. Figures 1-11 FIG. 1 shows the structure of a lifting device 100 according to an embodiment of the present invention. Figure 12 and Figure 13 A bridge construction hoisting method according to an embodiment of the present invention is shown.

[0051] like Figure 1 As shown, a lifting sling 100 according to an embodiment of the present invention includes: a sling main frame 1, a lifting eye assembly 2, and at least two lifting rods 3. The lifting eye assembly 2 is fixedly connected to the sling main frame 1, and one end of the at least two lifting rods 3 is connected to the sling main frame 1. The other end of each lifting rod 3 is provided with a pin connection portion 31, which is used to connect to the object to be lifted via an axle pin.

[0052] In addition, the angle between the two suspension rods 3 is greater than 0 degrees and less than 180 degrees.

[0053] It is understood that the lifting sling 100 is connected to the lifting rope 300 through the lifting eye assembly 2, and the lifting sling 100 and the object to be lifted are connected to form a whole through the axle pin. At this time, the object to be lifted can be lifted by controlling the lifting rope 300 through the lifting equipment. Since the object to be lifted and the lifting sling 100 are connected through multiple suspension rods 3, the multiple suspension rods 3 bear the weight of the object to be lifted in a dispersed manner, and the angle between the two suspension rods 3 can ensure that the two suspension rods 3 are aligned.

[0054] 3. A triangular stable structure is formed on the hoisted object to prevent the hoisted object from shaking relative to the lifting device 100, thereby ensuring the safety of the use of the lifting device 100 and the lifting process.

[0055] In the lifting sling 100 of the present application, the lifting sling 100 and the suspended object are connected by a pin connection portion 31, making installation and removal of the two relatively easy. In addition, the lifting sling 100 and the suspended object can be connected by a pin connection portion 31 by providing a temporary lifting lug 210 on the suspended object. This allows the lifting sling 100 to be used for different suspended objects, providing a high degree of versatility and reducing the construction cost of lifting different suspended objects.

[0056] In some embodiments, as Figure 1 As shown, the boom 3 includes a main cross bar 32 , two reinforcing diagonal bars 33 and a lower support bar 34 .

[0057] Two reinforcing diagonal bars 33 are arranged on either side of the main crossbar 32, with the distance between the reinforcing diagonal bars 33 and the main crossbar 32 gradually increasing in the direction away from the main frame 1 of the sling. A lower support bar 34 is located below the main crossbar 32, with the distance between the upper and lower support bars 34 and the main crossbar 32 gradually increasing in the direction away from the main frame 1 of the sling. The angle between the lower support bar 34 and the main crossbar 32 is less than or equal to 90 degrees. In this structure, the main crossbar 32, the reinforcing diagonal bars 33, and the lower support bar 34 are located on the same side of the main frame 1 of the sling, ensuring that the main crossbar 32, the reinforcing diagonal bars 33, and the lower support bar 34 are connected to the suspended object on the same side of the main frame 1 of the sling.

[0058] Thus, the connection position of the lifting sling 100 on the suspended object can be determined by the main crossbar 32. The two reinforcing diagonal bars 33 are located on both horizontal sides of the main crossbar 32, which can support the suspended object in the horizontal direction and prevent the suspended object from shaking horizontally relative to the lifting sling 100. The lower support bar 34 is located below the main crossbar 32 and cooperates with the main crossbar 32 to support the suspended object in the vertical direction and prevent the suspended object from swinging vertically relative to the lifting sling 100. Therefore, through the support of the suspended object by the main crossbar 32, the two reinforcing diagonal bars 33 and the lower support bar 34 in the horizontal and vertical planes, the lifting sling 100 is fixedly connected to the suspended object, reducing the shaking of the suspended object relative to the lifting sling 100 during the lifting process, and ensuring the safety of the use of the lifting sling 100.

[0059] Furthermore, if Figure 2-Figure 4 As shown, the spreader main frame 1 includes a spreader top plate 11 , two spreader webs 12 and two spreader bottom plates 13 .

[0060] The spreader top plate 11 is horizontally arranged. Spreader webs 12 are vertically connected to the bottom of the spreader top plate 11, with two spreader webs 12 arranged parallel and spaced apart. A spreader bottom plate 13 is connected to the side of each spreader web 12 facing away from the other spreader web 12, and the spreader bottom plates 13 are spaced apart and arranged below the spreader top plate 11.

[0061] Among them, the lifting ear assembly 2 is fixedly connected to the top of the sling top plate 11, so that the lifting rope 300 can be connected above the sling main frame 1, ensuring that the lifting rope 300 is subjected to uniform and stable force when lifting the target, and the sling main frame 1 is not prone to shaking.

[0062] One end of the main cross bar 32 and the lower support bar 34 are connected between the two spreader webs 12. The two spreader webs 12 can limit the horizontal position of the main cross bar 32 and the lower support bar 34 on the spreader main frame 1, preventing the main cross bar 32 and the lower support bar 34 from shaking relative to the spreader main frame 1 in the horizontal direction.

[0063] In addition, two reinforcing diagonal rods 33 are provided corresponding to the two sling base plates 13 and are connected between the sling base plate 13 and the sling top plate 11. Through the cooperation of the sling top plate 11 and the sling base plate 13, the installation position of the reinforcing diagonal rod 33 in the vertical direction of the sling main frame 1 can be limited to prevent the reinforcing diagonal rod 33 from swinging in the vertical direction relative to the sling main frame 1.

[0064] Under such a structure, there are more hollow parts in the sling main frame 1, which can reduce the material cost required to manufacture the sling main frame 1 while ensuring the load-bearing capacity of the sling main frame 1. The sling main frame 1 is lighter in weight, and when the lifting weight of the lifting rope 300 is limited, a target with a larger mass can be lifted.

[0065] Specifically, the spreader main frame 1 further includes two limiting side plates 14, each of which is connected between the spreader top plate 11 and the spreader bottom plate 13. The end of the reinforcing diagonal rod 33 is located between the limiting side plates 14 and the spreader web 12. Thus, through the cooperation between the limiting side plates 14 and the spreader web 12, the horizontal installation position of the reinforcing diagonal rod 33 on the spreader main frame 1 can be limited, preventing the reinforcing diagonal rod 33 from shaking in the horizontal direction relative to the spreader main frame 1.

[0066] Specifically, the sling main frame 1 further includes a rib 15 located below the sling bottom plate 13 and perpendicularly connected to the sling web 12. The rib 15 is used to reinforce the connection between the sling top plate 11 and the sling bottom plate 13, while also providing support for both the sling top plate 11 and the sling bottom plate 13. This enhances the overall structural strength of the sling main frame 1 and improves the overall load-bearing capacity of the lifting sling 100, making it suitable for lifting heavier objects.

[0067] In some embodiments, the spreader main frame 1 is a welded part. Thus, the components of the spreader main frame 1 are connected by welding, which is relatively simple in manufacturing process and has a certain strength in the connection between the components.

[0068] In some embodiments, as Figure 5-Figure 7 As shown, the main cross bar 32 includes two opposite first channel steels 321 and two first closing plates 323 .

[0069] A first rod cavity 320 is formed between the two first channel steels 321. Multiple first connecting plates 322 are welded to the two first channel steels 321 outside the first rod cavity 320. These multiple first connecting plates 322 are arranged along the length of the main crossbar 32. Two first closing plates 323 are located at both ends of the first rod cavity 320 and are welded to the two first channel steels 321, respectively.

[0070] In this structure, the hollow space in the main crossbar 32 is large, which can reduce the weight of the main crossbar 32 while ensuring the structural strength of the main crossbar 32. At the same time, the first sealing plate 323 can reduce the weight increase of the main crossbar 32 caused by impurities entering the first channel steel 321.

[0071] Among them, the weight borne by the main cross bar 32 can be dispersed by the two first channel steels 321, which can increase the load-bearing capacity of the main cross bar 32. By setting multiple first connecting plates 322, the two first channel steels 321 can be connected as a whole, and the first rod cavity 320 between the two channel steels can be kept at a certain width, that is, the two first channel steels 321 are not in direct contact, ensuring the weight dispersion effect of the two first channel steels 321.

[0072] In addition, the two first steel channels 321 are provided with corresponding first connection holes 324, through which the main crossbar 32 is connected to the axle pin of the suspended object. A first reinforcement plate 325 is welded to at least one of the first connection holes 324. The first reinforcement plate 325 increases the length of the first connection hole 324 and enhances the structural strength of the first steel channel at the first connection hole 324, thereby reducing deformation of the first steel channel under stress and ensuring a more stable and reliable connection between the first connection hole 324 and the axle pin of the suspended object.

[0073] Furthermore, if Figures 8-10 As shown, the lower support rod 34 includes two opposite second channel steels 341 and two second closing plates 343 .

[0074] A second rod cavity 340 is formed between the two second channel steels 341. A plurality of second connecting plates 342 are welded and connected to the two second channel steels 341 outside the second rod cavity 340.

[0075] Two connecting plates 342 are arranged along the length of the lower support rod 34. Two second sealing plates 343 are located at both ends of the second rod cavity 340 and are welded to the two second channel steels 341. Furthermore, the second sealing plates 343 prevent impurities from entering the second channel steels 341 and increasing the weight of the lower support rod 34.

[0076] In such a structure, the hollow space in the lower support rod 34 is relatively large, which can reduce the weight of the lower support rod 34 while ensuring the structural strength of the lower support rod 34 .

[0077] Among them, the weight borne by the lower support rod 34 can be dispersed by the two second channel steels 341, which can increase the load-bearing capacity of the lower support rod 34. By setting multiple second connecting plates 342, the two second channel steels 341 can be connected as a whole, and the second rod cavity 340 between the two channel steels can be kept at a certain width, that is, the two second channel steels 341 are not in direct contact, ensuring the weight dispersion effect of the two second channel steels 341.

[0078] Furthermore, two second channel steels 341 are provided with corresponding second connection holes 344, through which the lower support rod 34 is connected to the axle pin of the suspended object. A second reinforcement plate 345 is welded to at least one of the second connection holes 344. The second reinforcement plate 345 increases the length of the second connection hole 344 and strengthens the structural strength of the second channel steel 341 at the second connection hole 344, thereby reducing deformation of the second channel steel 341 under load and ensuring a more stable and reliable connection between the second connection hole 344 and the axle pin of the suspended object.

[0079] Furthermore, if Figure 11As shown, the reinforcing diagonal rod 33 is made of square steel, and a third connecting hole 331 is provided on the reinforcing diagonal rod 33 , and a third reinforcing plate 332 is welded to the third connecting hole 331 .

[0080] It is understood that the diagonal reinforcing rod 33 needs to withstand stress in more directions than the main crossbar 32 and the lower support rod 34. Therefore, using square steel as the reinforcing rod 33 ensures its structural strength. Furthermore, the diagonal reinforcing rod 33 is connected to the axle pin of the suspended object via the third connecting hole 331. The provision of the third reinforcing plate 332 increases the length of the third connecting hole 331 and enhances the structural strength of the diagonal reinforcing rod 33 at the second connecting hole 344, thereby reducing deformation of the diagonal reinforcing rod 33 under stress and ensuring a more stable and reliable connection between the third connecting hole 331 and the axle pin of the suspended object.

[0081] According to the bridge construction hoisting method of this embodiment, the hoisting device 100 of any of the above embodiments is used, and the following steps are included:

[0082] S1: Install at least two sets of temporary lifting lugs 210 on the building material 200 to be lifted.

[0083] S2: Using a lifting sling 100 , each set of temporary lifting lugs 210 is correspondingly connected to a lifting sling 100 , and the pin connection portion 31 of the lifting sling 100 is pinned to the temporary lifting lugs 210 .

[0084] S3: Pulling the hoisting rope 300 of the hoisting sling 100 .

[0085] like Figure 12 As shown, a specific embodiment of a bridge construction hoisting method is provided. A building material 200 to be hoisted is equipped with multiple sets of temporary lifting lugs 210 on both sides. Two lifting slings 100 are connected to the temporary lifting lugs 210 on either side of the building material 200 via pin connections 31. Furthermore, a lifting cable 300 is connected to the top of each lifting sling 100. By pulling two different lifting cables 300, the building material 200 can be hoisted.

[0086] In the bridge construction hoisting method of the present invention, the connection and disassembly of the lifting device 100 and the hoisted object are relatively simple, and the hoisting of the hoisted object is relatively simple. Moreover, the lifting device 100 can be applied to different hoisted objects and has good versatility.

[0087] Furthermore, if Figure 13 As shown, the hoisting equipment includes: a traction device 400 and a slide rail 500. The traction device 400 is used to control the position of the lifting cable 300 in the vertical direction. At the same time, the movement of the traction device 400 on the slide rail 500 can drive the lifting cable 300 to move horizontally, thereby controlling the lifting height and lifting position of the building material 200 through the traction device 400 and the lifting cable 300.

[0088] Other components of the lifting device 100 according to the embodiment of the present invention and other operations of the bridge construction lifting method using the same are well known to those skilled in the art and will not be described in detail here.

[0089] Throughout this specification, reference to terms such as "embodiment" or "example" indicates that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0090] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A lifting sling, characterized in that: include: Spreader main frame (1); A lifting lug assembly (2), wherein the lifting lug assembly (2) is fixedly connected to the main frame (1) of the lifting device; Four suspension rods (3), one end of each suspension rod (3) is connected to the suspension main frame (1), the other end of each suspension rod (3) is provided with a pin connection portion (31), the pin connection portion (31) is used to connect to a suspended object via an axle pin, and the angle between two suspension rods (3) is greater than 0 degrees and less than 180 degrees; Wherein, the four suspension rods (3) are specifically: A main crossbar (32), two reinforcing diagonal bars (33) and a lower support bar (34); The two reinforcing diagonal bars (33) are arranged on both horizontal sides of the main cross bar (32), and the distance between the reinforcing diagonal bars (33) and the main cross bar (32) gradually increases in a direction away from the main frame (1) of the sling; The lower support rod (34) is located below the main cross bar (32), and the distance between the lower support rod (34) and the main cross bar (32) gradually increases in the direction away from the main frame (1) of the sling, and the angle between the lower support rod (34) and the main cross bar (32) is less than or equal to 90 degrees.

2. The lifting sling according to claim 1, characterized in that: The sling main frame (1) comprises: A spreader top plate (11), wherein the spreader top plate (11) is arranged horizontally; Two spreader webs (12), the spreader webs (12) being vertically connected to the bottom of the spreader top plate (11), the two spreader webs (12) being arranged in parallel and spaced apart; Two spreader bottom plates (13), one side of each spreader web (12) away from the other spreader web (12) is connected to the spreader bottom plate (13), and the spreader bottom plates (13) are spaced apart and arranged below the spreader top plate (11); Wherein, the lifting ear assembly (2) is fixedly connected to the top of the sling top plate (11), one end of the main cross bar (32) and the lower support bar (34) are connected between the two sling webs (12), and the two reinforcing diagonal bars (33) are arranged corresponding to the two sling bottom plates (13) and are connected between the sling bottom plates (13) and the sling top plate (11).

3. The lifting sling according to claim 2, characterized in that: The sling main frame (1) also includes: Two limiting side plates (14), each of the limiting side plates (14) is connected between the sling top plate (11) and the sling bottom plate (13), and the end of the reinforcing diagonal rod (33) is located between the limiting side plates (14) and the sling web (12).

4. The lifting sling according to claim 2, characterized in that: The sling main frame (1) further comprises: a rib plate (15), wherein the rib plate (15) is located below the sling bottom plate (13) and is vertically connected to the sling web (12).

5. The lifting sling according to claim 1, characterized in that: The sling main frame (1) is a welded part.

6. The lifting sling according to claim 1, characterized in that: The main crossbar (32) comprises: Two opposing first channel steels (321), a first rod cavity (320) is formed between the two first channel steels (321), a plurality of first connecting plates (322) are welded and connected to the two first channel steels (321) outside the first rod cavity (320), and the plurality of first connecting plates (322) are arranged along the length direction of the main crossbar (32); Two first sealing plates (323), the two first sealing plates (323) are located at both ends of the first rod cavity (320), and the two first sealing plates (323) are respectively welded to the two first channel steels (321); Wherein, first connection holes (324) are correspondingly provided on the two first channel steels (321), and a first reinforcing plate (325) is welded to at least one of the first connection holes (324).

7. The lifting sling according to claim 1, characterized in that: The lower support rod (34) comprises: Two opposing second channel steels (341), a second rod cavity (340) is formed between the two second channel steels (341), a plurality of second connecting plates (342) are welded and connected to the two second channel steels (341) outside the second rod cavity (340), and the plurality of second connecting plates (342) are arranged along the length direction of the lower support rod (34); Two second sealing plates (343), the two second sealing plates (343) are located at both ends of the second rod cavity (340), and the two second sealing plates (343) are respectively welded to the two second channel steels (341); Wherein, two second channel steels (341) are correspondingly provided with second connection holes (344), and a second reinforcing plate (345) is welded to at least one of the second connection holes (344).

8. The lifting sling according to claim 1, characterized in that: The reinforcing oblique rod (33) is made of square steel. A third connecting hole (331) is provided on the reinforcing oblique rod (33), and a third reinforcing plate (332) is welded to the third connecting hole (331).

9. A bridge construction hoisting method, using the lifting device (100) according to any one of claims 1 to 8, characterized in that: The steps include: Installing at least two sets of temporary lifting lugs (210) on the building material (200) to be lifted; The lifting sling (100) is used, and each group of the temporary lifting lugs (210) is connected to a corresponding lifting sling (100). The pin connection portion (31) of the lifting device (100) is pinned to the temporary lifting lug (210); A hoisting rope (300) is used to pull the hoisting sling (100).

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