CN113428772A

CN113428772A - Lifting appliance for lifting reinforcement cage and lifting machine

Info

Publication number: CN113428772A
Application number: CN202110824285.0A
Authority: CN
Inventors: 马华兵; 路建松; 任睿乔; 高世品; 赵卫央; 赵欢乐
Original assignee: CCCC SHB Sixth Engineering Co Ltd
Current assignee: CCCC Second Highway Engineering Bureau Co., Ltd; CCCC SHB Sixth Engineering Co Ltd
Priority date: 2021-07-21
Filing date: 2021-07-21
Publication date: 2021-09-24

Abstract

According to the lifting appliance and the lifting machine for lifting the steel reinforcement cage, the m rows and n columns of lifting chain groups are arranged at the bottom of the truss, so that multipoint lifting on the same plane of the steel reinforcement cage can be realized, each lifting chain group comprises k bearing chains with sequentially increased lengths, and multipoint lifting on the same vertical line of the steel reinforcement cage can be realized. A plurality of bearing rods are horizontally inserted into the reinforcement cage in a layered mode, the lifting hooks are directly connected with the bearing rods, and the bearing rods are in contact with all framework pieces and the reinforcements on the layer where the bearing rods are located. According to the lifting appliance and the lifting machine for lifting the steel reinforcement cage, the lifting tension born by the steel reinforcement cage is uniformly distributed at a plurality of point positions of the three-dimensional space of the steel reinforcement cage, the lifting tension born by each point position is effectively reduced, the fracture problem possibly caused by the fact that a framework piece or a steel reinforcement bears larger tension is avoided, the deformation of the steel reinforcement cage is also prevented, and meanwhile, the steel reinforcement cage can be kept balanced during lifting by multi-point lifting.

Description

Lifting appliance for lifting reinforcement cage and lifting machine

Technical Field

The invention relates to the technical field of hoisting equipment, in particular to a lifting appliance and a hoisting machine for lifting a steel reinforcement cage.

Background

The urban comprehensive pipe gallery has the advantages of guaranteeing the safety of municipal pipelines, improving the underground space utilization rate, beautifying the urban environment, avoiding repeated excavation of the road surface and the like, and is a requirement for novel urbanization development. Along with the popularization of the pipe gallery prefabrication and assembly construction process in the urban comprehensive pipe gallery, the pipe gallery construction gradually moves towards standardization, modularization and industrialization.

In the production of the whole prefabrication scale of the pipe gallery, the reinforcement cage needs to be integrally lifted and hoisted to the template for entering the template for pouring. However, in the prior art, in the overall allocation and transportation process of the reinforcement cage, the hoisting equipment is only connected with the top of the reinforcement cage and is directly connected with the framework piece or the reinforcement of the reinforcement cage, and due to the fact that the weight of the reinforcement cage is large, the hoisting mode easily causes deformation of the reinforcement cage and even breaks the framework piece or the reinforcement.

Disclosure of Invention

The invention provides a lifting appliance and lifting machinery for lifting a steel reinforcement cage, which are used for solving the defect that the lifting appliance is only connected with framework pieces or steel reinforcements at the top of the steel reinforcement cage in the prior art, so that the steel reinforcement cage is deformed or damaged during lifting, and the effects of simultaneously lifting at least the top and the bottom of the steel reinforcement cage and dispersing lifting force to each framework piece through a bearing rod are realized.

The invention provides a lifting appliance for lifting a reinforcement cage, which comprises: the top of the truss is provided with a plurality of lifting lugs, and the bottom of the truss is provided with a plurality of connecting devices; the hoisting chain groups are distributed in m rows and n columns, each hoisting chain group comprises k bearing chains and a hanging ring, the lengths of the k bearing chains are sequentially increased, one end of each of the k bearing chains is connected with one connecting device through the hanging ring, and the other end of each of the k bearing chains is provided with a lifting hook; the bearing rods are horizontally inserted into the reinforcement cage and distributed in k layers, m or n bearing rods are arranged on each layer of bearing rods corresponding to the positions of the hoisting chain groups, and each bearing rod is connected with n or m lifting hooks corresponding to the positions; and k is more than or equal to 2, at least one layer of bearing rod is arranged at the top of the reinforcement cage, and at least one layer of bearing rod is arranged at the bottom of the reinforcement cage.

The invention provides a lifting appliance for lifting a steel reinforcement cage, wherein each lifting chain group further comprises k-1 adjusting chains, one end of each adjusting chain is connected with a lifting ring, the other end of each adjusting chain is provided with a connecting piece which can be detachably connected with one of the bearing chains, and the connecting pieces can be selectively connected to different positions of the bearing chains in the length direction.

The invention provides a lifting appliance for lifting a steel reinforcement cage.

The invention provides a lifting appliance for lifting a steel reinforcement cage, wherein the truss comprises an upper-layer main truss, a lower-layer main truss and a plurality of connecting rods arranged between the upper-layer main truss and the lower-layer main truss, and two ends of each connecting rod are detachably connected with the upper-layer main truss and the lower-layer main truss.

The lower-layer main truss comprises a plurality of second cross rods, a plurality of second longitudinal rods and a plurality of inclined rods, the inclined rods are distributed between the second cross rods and the second longitudinal rods in a triangular mode, and the second cross rods, the second longitudinal rods and the inclined rods are detachably connected.

The lifting device for lifting the steel reinforcement cage is provided with four lifting lugs, and the four lifting lugs are distributed in a rectangular shape.

The invention also provides hoisting machinery which comprises a crane main body and the lifting appliance for lifting the steel reinforcement cage, wherein the lifting lug is connected with the crane main body through a steel wire rope and a shackle.

According to the lifting appliance and the lifting machine for lifting the steel reinforcement cage, the m-row and n-column lifting chain groups are arranged at the bottom of the truss, so that the steel reinforcement cage can be lifted at multiple points, on one hand, the tension at each lifting point can be dispersed, and on the other hand, the steel reinforcement cage can be kept balanced during lifting. Each group of hoisting chain group comprises k bearing chains with sequentially increased lengths, multi-point hoisting of the steel reinforcement cage can be realized on the same vertical line, hoisting tension can be distributed at a plurality of point positions in the vertical direction, tension born by a certain layer of the steel reinforcement cage is reduced, and especially tension born by the top layer of the steel reinforcement cage is reduced. The bearing rods are horizontally inserted into the steel reinforcement cage in a layered mode, the lifting hooks are directly connected with the bearing rods, the bearing rods are in contact with all the framework pieces and the steel reinforcements on the layer where the bearing rods are located, lifting tension can be distributed to each framework piece, stress of the steel reinforcement cage is balanced, and tension borne by a single framework piece is reduced. In conclusion, the lifting appliance and the lifting machine for lifting the steel reinforcement cage, provided by the invention, effectively solve the problem of deformation of the steel reinforcement cage during lifting, avoid the problem of fracture possibly caused by large tensile force borne by the framework pieces or the steel reinforcement, and simultaneously, balance can be kept during lifting by multi-point lifting.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a front view of a spreader for lifting a reinforcement cage according to the present invention;

FIG. 2 is a left side view of a spreader for lifting a steel reinforcement cage according to the present invention;

FIG. 3 is a top view of a spreader for lifting a steel reinforcement cage according to the present invention;

FIG. 4 is an enlarged view at A of FIG. 2 according to the present invention;

FIG. 5 is an enlarged view at B of FIG. 3 in accordance with the present invention;

FIG. 6 is a schematic diagram of a hoist chain assembly according to the present invention;

FIG. 7 is a schematic structural view of a connector provided by the present invention;

reference numerals:

1: a load-bearing bar; 2: lifting lugs; 3: a hoisting chain group;

301: a load chain; 302: a hoisting ring; 303: a hook;

304: adjusting the chain; 305: a connecting member; 3051: a regulator body;

3052: a first hanging shaft; 3053: an extending arm; 3054: an inclined groove;

3055: a vertical slot; 401: a first cross bar; 402: a first longitudinal bar;

501: a second cross bar; 502: a second longitudinal bar; 503: a diagonal bar;

601: an oblique pull rod; 602: a longitudinal tie rod; 701: a connecting plate;

702: a second hanging shaft; 8: a wire rope; 9: and (6) shackle dismounting.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The spreader and the hoisting machine for hoisting a reinforcement cage according to the present invention will be described with reference to fig. 1 to 7.

The invention provides a lifting appliance for lifting a steel reinforcement cage, which comprises a truss, a plurality of groups of lifting chain groups 3 and a plurality of bearing rods 1. The top of truss is provided with a plurality of lugs 2, and lug 2 is used for being connected with jack-up machinery, and the bottom of truss is provided with a plurality of connecting device, and foretell multiunit jack-up chain group 3 is connected with a plurality of connecting device. Each set of hoisting chain set 3 comprises k bearing chains 301 with the length increasing in sequence and a hoisting ring 302, the bearing chains 301 are all connected with the hoisting ring 302 and are connected with a connecting device at the bottom of the truss through the hoisting ring 302, and one ends, far away from the hoisting ring 302, of the bearing chains 301 are connected with lifting hooks 303. The bearing rods 1 are used for being inserted into the reinforcement cage along the horizontal direction, the bearing rods 1 are distributed in k layers, m or n bearing rods 1 on each layer are arranged corresponding to the positions of the hoisting chain groups 3, and each bearing rod 1 is connected with n or m lifting hooks 303 corresponding to the positions.

The lifting lugs 2 at the top of the truss are at least three, the three lifting lugs 2 can determine a plane, the balance of the truss can be guaranteed during lifting, and the connecting devices at the bottom of the truss are distributed according to m rows and n columns.

The hoisting chain groups 3 are arranged in a plurality and are respectively connected with the connecting devices at the bottom of the truss in an m-row and n-column arrangement mode. A plurality of hoisting chain group 3 are connected with the steel reinforcement cage simultaneously and lift by crane, can distribute the pulling force of lifting by crane to a plurality of position, can reduce the pulling force that every lifts by crane the position and bear, prevent to cause the damage to reinforcing bar or skeleton piece, also can guarantee simultaneously that the steel reinforcement cage can keep balance after lifting by crane. Wherein, k is greater than or equal to 2, bear chain 301 and set up two at least promptly, when k is 2, can guarantee at least that shorter bears chain 301 can be connected with steel reinforcement cage's top, longer bearing chain 301 can be connected with steel reinforcement cage's bottom, can distribute to a plurality of positions along steel reinforcement cage direction of height with lifting by crane the pulling force, can further reduce the pulling force that every position bore, prevent that the steel reinforcement cage from taking place to damage at the in-process of lifting by crane, the multiple spot is lifted by crane also the steel reinforcement cage atress is more balanced, prevent to take place to warp. When k is larger than 2, the bearing chains 301 can be connected with the top, the bottom and the middle of the reinforcement cage at multiple positions, so that the tensile force borne by each lifting point is further shared, and the deformation of the reinforcement cage can be further prevented.

But in bearing bar 1 level inserted steel reinforcement cage, bearing bar 1 can distribute according to k layer, and when bearing bar 1 inserted according to the direction of bearing chain 301's row, bearing bar 1 needed the direction distribution n root of going along, and many bearing bars 1 are located same horizontal plane, and every bearing bar 1 all is connected with m lifting hooks 303 of this row. Or when the bearing rods 1 are inserted in the row direction of the bearing chains 301, m bearing rods 1 need to be distributed along the row direction, the plurality of bearing rods 1 are located on the same horizontal plane, and each bearing rod 1 is connected with n hooks 303 of the row. As for how to insert, it is selected according to the use scene, and it is preferable that the bearing bar 1 is inserted perpendicularly to the plane of the skeleton sheet.

After bearing bar 1 inserts the steel reinforcement cage, every skeleton piece that bearing bar 1 passed through all contacts with bearing bar 1, and when lifting by crane, each contact point all can regard as the hoisting point, can with the pulling force sharing that lifts by crane on every point position of skeleton piece and bearing bar 1 contact, further reduce the pulling force that the single-point bore, better prevent that the steel reinforcement cage warp, the balance of steel reinforcement cage when further guaranteeing to lift by crane.

In the practical use process, when each hook of a set of hoisting chains is connected with the load-bearing bar 1 and then hoisted, the problem that the distance from a hoisting point to the hoisting ring 302 is smaller than the length of the load-bearing chain 301 may occur, so that in the hoisting process, although the hoisting hook 303 of the load-bearing chain 301 is already connected with the load-bearing bar 1, the load-bearing chain 301 is in a loose state, and hoisting tension cannot be provided, so that the problem that the reinforcement cage is stressed unevenly occurs. Therefore, in one embodiment of the present invention, each set of hoisting chain sets 3 further includes k-1 adjusting chains 304, one end of each adjusting chain 304 is connected to the hanging ring 302, the other end of each adjusting chain 304 is provided with a connecting member 305 capable of being detachably connected to one of the carrying chains 301, and the connecting member 305 is selectively connected to different positions in the length direction of the carrying chains 301 to adjust the use length of the carrying chains 301.

When the lifting device is used, the lifting hooks 303 of the bearing chains 301 of each group of hoisting chain groups 3 are connected with the bearing rods 1 at corresponding positions, pre-hoisting is carried out after connection, when at least one bearing chain 301 of each group of hoisting chains is tensioned, the lifting device stops, at the moment, the non-tensioned bearing chains 301 are connected with the adjusting chains 304, the bearing chains 301 are connected with different length positions of the bearing chains 301 through the connecting pieces 305, the use lengths of the bearing chains 301 are adjusted, and the bearing chains 301 are all in a tensioned state. Therefore, the lifting tension of each lifting point of the steel reinforcement cage can be balanced when the steel reinforcement cage is lifted, the steel reinforcement cage is prevented from deforming, and the problem that the steel reinforcement cage is damaged due to the fact that the lifting tension of a certain point is concentrated is also prevented.

The used length of the carrier chain 301 refers to the length of the carrier chain 301 when tensioned.

Alternatively, in an embodiment of the present invention, the connecting member 305 may be a claw adjuster, and the claw adjuster may include an adjuster body 3051, a first hanger shaft 3052, and a cross-shaped groove. The first hanging shaft 3052 is used for being connected with the adjusting chain 304, and the cross groove is used for being detachably connected with the bearing chain 301.

The upper end of regulator main part 3051 is provided with two outrigger 3053 that upwards extend along width direction, leave the gap between two outrigger 3053, the width direction of following regulator main part 3051 on two outrigger 3053 is provided with the shaft hole, first hanging axle 3052 is worn to establish in this shaft hole, stretch out on the arm 3053 outward and still be provided with first fixed pinhole along first hanging axle 3052 radially, the first fixed pinhole of second that corresponds with first fixed pinhole on hanging axle 3052, can penetrate the fixed first axial position of hanging axle 3052 of fixed pin after adjusting well with first fixed pinhole and second. When the adjusting device is used, a chain ring of the adjusting chain 304 is placed between the gaps of the two extending arms 3053, the first hanging shaft 3052 penetrates through the adjusting chain, and the fixing pin penetrates through the adjusting chain to complete fixing.

A protrusion extending forward is disposed at a lower portion of a front side of the adjuster body 3051, and an inclined groove 3054 extending backward from top to bottom is disposed on the protrusion, a width of the inclined groove 3054 is equal to a width of the link, and a thickness of the inclined groove 3054 is equal to a thickness of the link. A vertical slot 3055 having a width equal to the thickness of the link is provided at the front side of the adjuster body 3051, and the length of the vertical slot 3055 in the longitudinal direction is greater than the length of the link. The vertical slot 3055 and the inclined slot 3054 thus form a cross slot. In use, two mutually perpendicular links are positioned one within the vertical slot 3055 and one within the angled slot 3054 to complete the attachment.

In one embodiment of the invention, the truss can comprise an upper layer main truss, a lower layer main truss and a connecting rod arranged between the upper layer main truss and the lower layer main truss, wherein two ends of the connecting rod are detachably connected with the upper layer main truss and the lower layer main truss. Because prefabricated piping lane's steel reinforcement cage is bulky, consequently, required truss volume is also great, and upper main truss sets up to components of a whole that can function independently structure with lower floor's main truss, and the centre is connected through the detachable connecting rod, can dismantle it when the transportation, transports and carries out the on-the-spot equipment after the scene, so, is convenient for transport the truss, reduces the cost of transportation and the transportation degree of difficulty.

In one embodiment of the present invention, the upper main truss may include a plurality of first cross bars 401 and a plurality of first longitudinal bars 402, the first cross bars 401 and the first longitudinal bars 402 form a grid structure, and the first cross bars 401 and the first longitudinal bars 402 may be detachably connected by bolts. So, can dismantle it when the transportation, transport to the scene after carry out the on-the-spot equipment, be convenient for transport the truss, reduce the cost of transportation and the transportation degree of difficulty. Referring to fig. 3, two first cross bars 401 may be provided, and three first longitudinal bars 402 may be provided, and may form a zigzag structure after being connected.

It should be noted that the first cross bar 401 and the first vertical bar 402 are only vertically disposed, and in the actual use process, both the first cross bar 401 and the first vertical bar 402 are in a horizontal state.

In an embodiment of the present invention, the lower primary truss includes a plurality of second cross bars 501, a plurality of second longitudinal bars 502, and a plurality of diagonal bars 503, the plurality of diagonal bars 503 may be connected between the second cross bars 501 and the second longitudinal bars 502 in a triangular shape, and the second cross bars 501, the second longitudinal bars 502, and the diagonal bars 503 are all detachably connected. So, can dismantle it when the transportation, transport to the scene after carry out the on-the-spot equipment, be convenient for transport the truss, reduce the cost of transportation and the transportation degree of difficulty.

Referring to fig. 3, two second cross bars 501 may be provided, five second longitudinal bars 502 may be provided, the five second longitudinal bars 502 are arranged in parallel, the two second cross bars 501 are connected to two ends of the five second longitudinal bars 502, and the outermost second cross bars 501 and the outermost second longitudinal bars 502 form a rectangle. The center of the second vertical rod 502 from left to right is connected with four diagonal rods 503, the four diagonal rods 503 are all detachably connected with the second vertical rod 502, and the other ends of the four diagonal rods 503 extend towards the end of the adjacent second vertical rod 502 in a radial shape and are detachably connected with the end of the second vertical rod 502. The center of the second longitudinal rod from right to left is also provided with four diagonal rods 503, the four diagonal rods 503 are all detachably connected with the second longitudinal rod 502, and the other ends of the four diagonal rods 503 extend towards the end of the adjacent second longitudinal rod 502 in a radial shape and are detachably connected with the end of the second longitudinal rod 502. Therefore, the inclined rods 503 and the second longitudinal rods 502 are connected to form a plurality of triangular structures, and the triangular structures are the most stable structures, so that the strength of the lower-layer main truss can be ensured, and the lower-layer main truss is prevented from deforming in the hoisting process.

In one embodiment of the present invention, the connecting rod includes a plurality of diagonal tie rods 601 and a plurality of longitudinal tie rods 602. Referring to fig. 1 and 2, the first cross bar 401 and the second cross bar 501 may be disposed opposite to each other in an up-down direction, the three first longitudinal bars 402 and the three second longitudinal bars 502 located in the middle of the first cross bar may be disposed opposite to each other in an up-down direction, an oblique pull rod 601 is disposed between four corners of the upper-layer main truss and four corners of the lower-layer main truss, two diagonal pull rods are disposed at the center of the first longitudinal bar 402, and second ends of the two diagonal pull rods are detachably connected to ends of the second longitudinal bars 502 located below the first longitudinal bar 402. The diagonal draw bars, the first vertical bar 402 and the second vertical bar 502 form a stable triangular structure, and the truss can be guaranteed to have enough strength in the hoisting process. A plurality of longitudinal pull rods 602 are distributed between the first cross rod 401 and the second cross rod 501 which are opposite, the longitudinal pull rods 602 are perpendicular to the first cross rod 401 and the second cross rod 501, and the longitudinal pull rods 602 are detachably connected with the first cross rod 401 and the second cross rod 501.

It should be noted that the detachable connection manner can be a bolt connection.

In an embodiment of the present invention, four lifting lugs 2 may be arranged, the four lifting lugs 2 are distributed in a rectangular shape, and the four lifting lugs 2 determine a plane, so that the truss can be ensured to be in a balanced state during lifting.

In an embodiment of the present invention, the connecting device may include two connecting plates 701 disposed in parallel, the two connecting plates 701 are disposed perpendicular to the second vertical rod 502, a gap is disposed between the two connecting plates 701, coaxial shaft holes are disposed on the two connecting plates 701, a second hanging shaft 702 is disposed in the shaft holes, the second hanging shaft 702 may be a bolt, after one end of the bolt passes through the shaft hole, a pin shaft perpendicular to the bolt may be disposed at the other end of the bolt to pass through the bolt, so as to block the axial movement of the bolt, or a nut may be disposed at a threaded end of the bolt to fix the bolt.

When the lifting ring 302 is used, the lifting ring 302 is inserted into a gap between the two connecting plates 701, a bolt penetrates through the shaft hole and the lifting ring 302, and then the bolt is fixed through a pin shaft or a nut.

On the other hand, the invention also provides a hoisting machine, which comprises a crane main body and the lifting appliance for lifting the reinforcement cage.

When the crane is used, four steel wire ropes 8 can be arranged, one ends of the steel wire ropes 8 are connected with a crane boom of the crane main body, and the other ends of the steel wire ropes 8 are connected with the lifting lugs 2 through shackles 9.

The lifting machine is provided with the lifting appliance for lifting the steel reinforcement cage, can guarantee that the steel reinforcement cage is lifted in a multi-point multi-layer connection mode when lifted, can effectively disperse the pulling force borne by each lifting point, prevents uneven stress, leads to a certain point to bear larger pulling force, further damages the steel reinforcement cage, can prevent the steel reinforcement cage from deforming when lifted in multiple points in the three-dimensional space of the steel reinforcement cage, and can also keep the steel reinforcement cage balanced.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A hoist for hoisting steel reinforcement cage, its characterized in that includes:

the top of the truss is provided with a plurality of lifting lugs, and the bottom of the truss is provided with a plurality of connecting devices;

the hoisting chain groups are distributed in m rows and n columns, each hoisting chain group comprises k bearing chains and a hanging ring, the lengths of the k bearing chains are sequentially increased, one end of each of the k bearing chains is connected with one connecting device through the hanging ring, and the other end of each of the k bearing chains is provided with a lifting hook;

the bearing rods are horizontally inserted into the reinforcement cage and distributed in k layers, m or n bearing rods are arranged on each layer of bearing rods corresponding to the positions of the hoisting chain groups, and each bearing rod is connected with n or m lifting hooks corresponding to the positions;

and k is more than or equal to 2, at least one layer of bearing rod is arranged at the top of the reinforcement cage, and at least one layer of bearing rod is arranged at the bottom of the reinforcement cage.

2. The lifting appliance for lifting a reinforcement cage according to claim 1, wherein each group of the lifting chains further comprises k-1 adjusting chains, one end of each adjusting chain is connected with the lifting ring, the other end of each adjusting chain is provided with a connecting piece which can be detachably connected with one of the carrying chains, and the connecting pieces can be selectively connected at different positions in the length direction of the carrying chains.

3. A spreader for lifting reinforcement cages as claimed in claim 2, wherein the connectors are cleat adjusters.

4. The lifting appliance for lifting a steel reinforcement cage according to claim 1, wherein the truss comprises an upper main truss, a lower main truss and a plurality of connecting rods arranged between the upper main truss and the lower main truss, and two ends of each connecting rod are detachably connected with the upper main truss and the lower main truss.

5. The lifting appliance for lifting a reinforcement cage according to claim 4, wherein the upper main truss comprises a plurality of first cross bars and a plurality of first longitudinal bars, and the first cross bars and the first longitudinal bars are detachably connected.

6. The lifting appliance for lifting a steel reinforcement cage according to claim 4, wherein the lower-layer main truss comprises a plurality of second cross bars, a plurality of second longitudinal bars and a plurality of inclined bars, the plurality of inclined bars are distributed between the second cross bars and the second longitudinal bars in a triangular manner, and the second cross bars, the second longitudinal bars and the inclined bars are detachably connected.

7. The spreader for hoisting a reinforcement cage according to claim 4, wherein the connecting rods comprise a plurality of diagonal tension rods and a plurality of longitudinal tension rods, and the diagonal tension rods are distributed in a triangular shape.

8. The lifting appliance for lifting a steel reinforcement cage according to claim 1, wherein four lifting lugs are provided, and four lifting lugs are distributed in a rectangular shape.

9. A spreader for lifting a reinforcement cage according to claim 1, wherein the connection means comprises two connection plates and a second hanger shaft arranged between the two connection plates.

10. Hoisting machinery, characterized by comprising a crane body and a lifting appliance for lifting a reinforcement cage according to any one of claims 1 to 9, wherein the lifting lug is connected with the crane body through a wire rope and a shackle.