Large-span cantilever slab edge support formwork device and large-span cantilever slab edge support formwork method

Abstract

The invention relates to the technical field of large-span cantilever slab construction, and aims to solve the problems of large disassembly and assembly workload, small layout spacing and difficult passage, high risk of edge operation and inadequate quality control of concrete forming at cantilevered parts in a method of supporting cantilever slabs with full-floor scaffolding, and provide a large-span cantilever slab edge formwork device and a large-span cantilever slab edge formwork method, the large-span cantilever slab edge formwork device comprising a column bracket arranged on a lower structure floor slab, the bottom of the column bracket being connected to a position on the lower structure floor slab corresponding to the lower structure beam; a horizontal cross bar bracket being connected to the top of the column bracket, the horizontal cross bar bracket being abutted against the formwork of the upper structure beam, and an oblique brace being connected between the horizontal cross bar bracket and the column bracket; a slab bottom secondary rib being arranged between the horizontal cross bar bracket and the formwork of the upper structure floor slab, the bottom of the slab bottom secondary rib being connected to the top surface of the horizontal cross bar bracket, and the top of the slab bottom secondary rib being abutted against the bottom surface of the formwork of the upper structure floor slab.

Description

Technical Field

[0001] The invention relates to the technical field of large-span cantilever slab construction, and in particular to a large-span cantilever slab edge support formwork device and a large-span cantilever slab edge support formwork method. Background Art

[0002] In recent years, due to the progress of construction technology and material strength, the long-span cantilever structure has gradually become one of the common forms in architecture after continuous discovery and exploration. Because the long-span cantilever structure has its own advantages. First, it can be extended to the outside in space; second, steel structure and concrete are the main materials for cantilever structure, which are easy to obtain; third, the cantilever structure has flexible spatial layout and can be used for multiple purposes. At present, many gymnasiums and theaters have similar long-span cantilever structures, and even the cantilevered lower space of some large shopping malls can be planned as parking lots, green belts and outdoor leisure places.

[0003] Currently in construction, the existing cantilever slab support method mostly adopts full-height scaffolding support under the cantilever slab. This support method requires a large workload for disassembly and assembly of the support frame; the layout space is densely spaced and difficult to pass; the risk of working on the edge of the high-rise cantilever slab high-form scaffolding support is high; and the quality control of concrete molding in the cantilever part is not in place. Summary of the invention

[0004] The present invention aims to provide a device for supporting the edge of a large-span cantilever slab and a method for supporting the edge of a large-span cantilever slab, so as to solve the problems in the prior art of using a full-floor scaffolding to support the cantilever slab, such as large workload for disassembly and assembly, difficulty in passage due to small layout spacing, high risk of edge operation and inadequate quality control of concrete molding at the cantilevered part.

[0005] The present invention is achieved by adopting the following technical solutions:

[0006] A large-span cantilever slab edge formwork device, comprising a column bracket arranged on a lower structure floor slab, a lower structure beam is connected below the lower structure floor slab, and the bottom of the column bracket is connected to a position on the lower structure floor slab corresponding to the lower structure beam;

[0007] The column bracket is used to support the formwork of the upper structure floor and the formwork of the upper structure beam connected below the upper structure floor;

[0008] A horizontal crossbar bracket is connected to the top of the column bracket, the horizontal crossbar bracket abuts against the template of the upper structure beam, and a diagonal brace is connected between the horizontal crossbar bracket and the column bracket;

[0009] A slab bottom secondary rib is provided between the horizontal cross bar bracket and the template of the upper structure floor, the bottom of the slab bottom secondary rib is connected to the top surface of the horizontal cross bar bracket, and the top of the slab bottom secondary rib abuts against the bottom surface of the template of the upper structure floor.

[0010] The large span refers to a span of 20 meters to 50 meters.

[0011] The portion between the place where the structural beam of the lower structure floor is set and the edge of the lower structure floor is the cantilevered portion of the lower structure floor. Similarly, for the upper structure floor, the portion between the place where the structural beam of the upper structure floor is set and the edge of the upper structure floor is the cantilevered portion of the lower structure floor, and the length of the cantilevered portion is 1 meter to 5 meters. The column bracket, the horizontal cross bar bracket and the bottom secondary rib of the slab together form a supporting structure, which can support the cantilevered portion of the upper structure floor, and the formwork of the upper structure floor and the formwork of the upper structure beam are supported by the above-mentioned supporting structure, and then the steel bars are tied inside the formwork, and the concrete of the upper structure floor and its structural beam is poured at one time.

[0012] The upper structure floor and the lower structure floor refer to the floor structure formed after pouring concrete, the template of the upper structure floor refers to the template arranged before pouring concrete of the upper structure floor, after pouring concrete in the template, the upper structure floor is formed after the concrete is formed, similarly, the template of the upper structure beam refers to the template arranged before pouring concrete of the upper structure beam, after pouring concrete in the template, the upper structure beam is formed after the concrete is formed. In the present invention, the template of the upper structure floor and the template of the upper structure beam are arranged together, and then the upper structure floor and the upper structure beam are poured together.

[0013] The present invention arranges column brackets corresponding to the connection between the lower structure floor and the structural beam, so that the column brackets are set back on the beam instead of being set on the cantilevered part of the lower structure floor, thereby avoiding the need to place vertical poles on the cantilevered plate when using full-floor brackets, reducing the stress on the cantilevered plate structure of the floor, avoiding construction risks, and increasing the safe space distance for edge operations. The column brackets are used to increase the construction work space (horizontal and vertical) distance, facilitate material transportation operations, reduce the workload of disassembly and assembly of full-floor formwork, increase the edge working space, reduce the risk of high-altitude operations near the edge, and improve the molding quality of edge cantilever concrete.

[0014] As the preferred technical solution:

[0015] The secondary ribs at the bottom of the plate are I-shaped and include an upper flange plate, a lower flange plate and a web plate therebetween. The upper flange plate abuts against the bottom surface of the formwork of the upper structure floor, and the lower flange plate is connected to the horizontal crossbar bracket by bolts.

[0016] The secondary ribs at the bottom of the board are in an I-shape, which has a simple structure, occupies a small space and has a high supporting strength.

[0017] As the preferred technical solution:

[0018] The column bracket comprises at least two column segments, and the adjacent column segments are slidably sleeved. The column segments are provided with adjustment holes, and bolts are installed in the adjustment holes.

[0019] By slidingly sleeve-connecting the two column segments, the two column segments can be extended and retracted, thereby changing the height of the column bracket to adapt to different floor heights. After adjusting to the appropriate height, align the adjustment holes on the column segments, and then install bolts in the holes to fix the two adjacent column segments.

[0020] As the preferred technical solution:

[0021] A pad is connected to the bottom of the column bracket, and the pad is connected to the lower structure floor through bolts.

[0022] The contact area between the column bracket and the lower structure floor is increased by the pad, so that the connection between the column bracket and the lower structure floor is more stable.

[0023] As the preferred technical solution:

[0024] The column bracket is a steel structure with high supporting strength.

[0025] As the preferred technical solution:

[0026] A plurality of the bottom ribs are provided between the horizontal cross bar support and the template of the upper structure floor, and at least one of the bottom ribs is supported at the edge of the template of the upper structure floor.

[0027] Since an upper structure beam is provided below the upper structure floor, it is necessary to set up the formwork of the upper structure floor and the upper structure beam when setting up the formwork, and since the two are not at the same height, it is necessary to support the upper structure floor formwork and the upper structure beam formwork separately, that is, to directly support the upper structure beam formwork by using the horizontal cross bar bracket, and to support the formwork of the upper structure beam by setting a bottom rib of the plate above the horizontal cross bar bracket.

[0028] The support is provided by arranging a plurality of the bottom secondary ribs of the slab at intervals, and at least one bottom secondary rib of the slab is provided to support the edge of the upper structure floor slab, so as to control the molding quality of the cantilevered concrete at the edge.

[0029] As the preferred technical solution:

[0030] A tensile and compressive column is also connected between one end of the horizontal cross bar bracket and the lower structure floor slab, and the tensile and compressive column is farther from the edge of the lower structure floor slab than the column bracket.

[0031] That is, the position of the column bracket is closer to the edge of the lower structure floor.

[0032] The tensile and compressive columns connect the horizontal cross bar bracket and the lower structure floor, which can reduce the stress on the end of the horizontal cross bar bracket and reduce the stress on the lower structure beam.

[0033] As the preferred technical solution:

[0034] The height of the tensile and compressive column can also be adjusted, and its structural form can refer to the structural form of the column bracket. It is also possible to set a plurality of column segments, and then sleeve two adjacent column segments and fix them with bolts to achieve the height adjustment of the tensile and compressive column.

[0035] As the preferred technical solution:

[0036] The template of the cantilevered part of the upper structure floor is an aluminum template.

[0037] On the one hand, the aluminum formwork is easy to disassemble, and on the other hand, the aluminum formwork has great structural strength, which is beneficial to improving the concrete molding quality of the cantilevered portion of the upper structure floor.

[0038] As the preferred technical solution:

[0039] The horizontal cross bar bracket includes two groups of angle steels arranged parallel to each other, the tops of the two groups of angle steels are connected by a connecting plate, and the lower flange plate is connected to the connecting plate and the angle steel by bolts.

[0040] The bolts pass through the connecting plate and the angle steel from the lower flange plate and are then tightened by nuts.

[0041] As the preferred technical solution:

[0042] The angle steel comprises a plurality of angle steel segments, and two adjacent angle steel segments are connected by bolts or welded.

[0043] Used to adapt to different overhang lengths.

[0044] A method for supporting the edge of a large-span cantilever slab using the large-span cantilever slab edge supporting device is used to support the upper structure floor and upper structure beams, wherein the upper structure beams are connected to the lower side of the upper structure floor, comprising the following steps:

[0045] Step 1: erecting a column support on the lower structure floor slab, wherein a lower structure beam is connected to the lower part of the lower structure floor slab, and setting the column support at a position corresponding to the lower structure beam;

[0046] Step 2: Install a horizontal cross bar bracket on the top of the column bracket, and connect a diagonal brace between the horizontal cross bar bracket and the column bracket;

[0047] Step 3: Install the bottom rib of the board above the horizontal crossbar bracket, and the installation position of the bottom rib of the board avoids the installation position of the template of the upper structure beam;

[0048] Step 4: Lay the templates for the upper structure floor and the upper structure beams, tie the steel bars in the templates, and then pour the concrete.

[0049] By adopting the above-mentioned formwork method, the formwork of the upper structure floor and the upper structure beam is supported by setting up column supports, horizontal cross bar supports and secondary ribs at the bottom of the slab. Compared with the method of arranging full-floor formwork frames, the workload is smaller, the passage space is increased, and the force of the formwork frames is not supported on the cantilevered part of the upper structure floor, but on the beam instead, which reduces the risk of high-altitude operations near the edge and improves the molding quality of the cantilevered concrete near the edge.

[0050] As the preferred technical solution:

[0051] In step 4, laying the formwork for the upper structure floor and the upper structure beam includes: laying the aluminum formwork for the cantilevered part of the upper structure floor, and laying the wooden formwork for other parts.

[0052] The cantilevered part formwork of the upper structure floor adopts right-angled aluminum formwork and steel structure column bracket. When removing the formwork, you can first remove other working surface support structures inside the floor, and finally remove the extended column bracket and aluminum formwork. It does not affect the entry and exit of the dismantled materials, and ensures that the structural strength of the cantilever plate reaches 100% of the design strength, and can also improve the molding quality of the edge cantilever concrete.

[0053] As the preferred technical solution:

[0054] In step 4, when laying the formwork, the secondary ribs at the bottom of the board are supported on the bottom surface of the formwork of the upper structure floor, and the horizontal cross bar bracket is directly supported on the bottom surface of the formwork of the upper structure beam.

[0055] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0056] The present invention arranges column brackets corresponding to the connection between the lower structure floor and the structural beam, so that the column brackets are set back on the beam instead of being set on the cantilevered part of the lower structure floor, thereby avoiding the need to place vertical poles on the cantilevered plate when using full-floor brackets, reducing the stress on the cantilevered plate structure of the floor, avoiding construction risks, and increasing the safe space distance for edge operations. The column brackets are used to increase the construction work space (horizontal and vertical) distance, facilitate material transportation operations, reduce the workload of disassembly and assembly of full-floor formwork, increase the edge working space, reduce the risk of high-altitude operations near the edge, and improve the molding quality of edge cantilever concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 It is a schematic diagram of the three-dimensional structure of the large-span cantilever slab edge formwork device described in the present invention.

[0058] Figure 2 It is a schematic plan view of the structure of the large-span cantilever slab edge formwork device according to the present invention.

[0059] Icons: 1-lower structure floor, 101-cantilevered part of lower structure floor, 2-lower structure beam, 3-upper structure floor, 301-cantilevered part of upper structure floor, 4-upper structure beam, 5-column bracket, 6-horizontal cross bar bracket, 7-bottom secondary rib of plate, 701-upper flange plate, 702-lower flange plate, 703-web plate, 8-diagonal brace, 9-pad, 10-tension and compression column, 11-adjustment hole, 12-aluminum formwork, 13-wooden formwork. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] Example 1

[0062] See also Figure 1-Figure 2 This embodiment proposes a large-span cantilever slab edge support formwork device, which is arranged on a lower structure floor 1, and a lower structure beam 2 is provided below the lower structure floor 1. The lower structure floor 1 and the lower structure beam 2 are integrally formed.

[0063] The formwork device includes a column bracket 5, the column bracket 5 is vertically arranged, and the bottom of the column bracket 5 is connected to the position on the lower structure floor 1 corresponding to the lower structure beam 2, that is, the column bracket 5 is arranged on the upper surface of the lower structure floor 1, and the lower structure beam 2 is located on the lower surface of the lower structure floor 1, and the positions of the two correspond. The bottom of the column bracket 5 is connected to a pad 9, and the pad 9 is connected to the lower structure floor 1 by bolts. The pad 9 increases the contact area between the column bracket 5 and the lower structure floor 1, so that the column bracket 5 is more firmly connected to the lower structure floor 1. In this embodiment, the column bracket 5 is a steel structure with high strength.

[0064] The top of the column bracket 5 is connected to a horizontal cross bar bracket 6, which is horizontally arranged and perpendicular to the column bracket 5. The horizontal cross bar bracket 6 includes two groups of angle steels arranged parallel to each other. The tops of the two groups of angle steels are connected by a connecting plate. The angle steel includes multiple angle steel segments, and two adjacent angle steel segments are connected by bolts or welding to adapt to different cantilever lengths.

[0065] A diagonal brace 8 is connected between the horizontal crossbar support 6 and the column support 5, and the diagonal brace 8 forms a triangular area between the horizontal crossbar support 6 and the column support 5 to increase the stability of the supporting structure. The diagonal brace 8 can be made of angle steel.

[0066] A plate bottom secondary rib 7 is provided above the horizontal crossbar bracket 6, and the bottom of the plate bottom secondary rib 7 is connected to the top surface of the horizontal crossbar bracket 6. Specifically, the plate bottom secondary rib 7 is I-shaped, and includes an upper flange plate 701, a lower flange plate 702, and a web plate 703 located therebetween. The lower flange plate 702 is connected to the connecting plate and the angle steel by bolts, and the bolts are sequentially connected to the lower flange plate 702, the connecting plate, and the angle steel, and then locked by nuts.

[0067] The support structure formed by the column bracket 5, the horizontal crossbar bracket 6 and the bottom secondary rib 7 is used to support the formwork of the upper structure floor 3 and the formwork of the upper structure beam 4 connected below the upper structure floor 3. Then, the steel bars are tied inside the formwork, and the concrete of the upper structure floor 3 and its structural beam is poured at one time. The horizontal crossbar bracket 6 directly abuts against the bottom surface of the formwork of the upper structure beam 4, and the top of the bottom secondary rib 7 (i.e., the upper flange plate 701) abuts against the bottom surface of the formwork of the upper structure floor 3.

[0068] Preferably, a plurality of the bottom ribs 7 are provided between the horizontal crossbar support 6 and the template of the upper structure floor 3, and the bottom ribs 7 are arranged at intervals to evenly support the template of the upper structure floor 3. At least one bottom rib 7 is supported at the edge of the template of the upper structure floor 3 to ensure the molding quality of the concrete of the cantilevered portion 301 of the upper structure floor.

[0069] In the above structure, the force exerted on the secondary rib 7 at the bottom of the board is transmitted to the column bracket 5, and the column bracket 5 is supported above the lower structure beam 2. The force acts on the beam, which reduces the structural force on the cantilevered part of the lower structure floor 1.

[0070] A tensile and compressive column 10 is also connected between one end of the horizontal crossbar support 6 and the lower structure floor 1, and the tensile and compressive column 10 is farther away from the edge of the lower structure floor 1 than the column support 5. The tensile and compressive column 10 connects the horizontal crossbar support 6 and the lower structure floor 1, which can reduce the stress on the end of the horizontal crossbar support 6 and the stress on the lower structure beam 2.

[0071] In this embodiment, the column bracket 5 includes at least two column segments, and two adjacent column segments are slidably sleeved. The column segments are provided with adjustment holes 11, and bolts are installed in the adjustment holes 11. By slidingly sleeved the two column segments, the two column segments can be extended and retracted, thereby changing the height of the column bracket 5 to adapt to different floor heights. After adjusting to a suitable height, the adjustment holes 11 on the column segments are aligned, and then bolts are installed in the holes to fix the two adjacent column segments. The structural form of the tensile and compressive column 10 can refer to the structural form of the column bracket 5, and its height can also be adjusted. It can be set to multiple column segments, and then two adjacent column segments are sleeved, and adjustment holes 11 are set on the column segments, and the two column segments are fixed by bolts passing through the adjustment holes 11.

[0072] The template of the cantilevered portion 301 of the upper structure floor slab adopts an aluminum template 12, specifically, a right-angle flanged aluminum template 12, the templates of other parts of the upper structure floor slab 3 adopt a wooden template 13, and the template of the upper structure beam 4 adopts a wooden template 13. In this embodiment, the template of the upper structure floor slab 3 and the template of the upper structure beam 4 are arranged together, and then the upper structure floor slab 3 and the upper structure beam 4 are cast together.

[0073] The formwork method using the above-mentioned large-span cantilever slab edge formwork device comprises the following steps:

[0074] Step 1: Set up a column bracket 5 on the lower structure floor 1, and fix the pad 9 at the bottom of the column bracket 5 to the lower structure floor 1 by bolts. The lower structure floor 1 is connected to the lower structure beam 2, and the column bracket 5 is set at a position corresponding to the lower structure beam 2;

[0075] Step 2: Install a horizontal crossbar support 6 on the top of the column support 5, and connect a diagonal brace 8 between the horizontal crossbar support 6 and the column support 5;

[0076] Step 3: Install the plate bottom secondary rib 7 above the horizontal cross bar bracket 6, and fix the lower flange plate 702 of the plate bottom secondary rib 7 to the horizontal cross bar bracket 6 by bolts, and the installation position of the plate bottom secondary rib 7 avoids the installation position of the template of the upper structure beam 4;

[0077] Step 4: Laying the templates of the upper structure floor 3 and the upper structure beam 4, the laying of the templates of the upper structure floor 3 and the upper structure beam 4 includes: laying the aluminum template 12 of the cantilevered part 301 of the upper structure floor, and laying the wooden template 13 of other parts, when laying the template, the bottom secondary rib 7 of the board is supported on the bottom surface of the template of the upper structure floor 3, and the horizontal cross bar bracket 6 is directly supported on the bottom surface of the template of the upper structure beam 4;

[0078] Step 5: Tie the steel bars inside the formwork, and then pour the concrete of the upper structure floor slab 3 and the upper structure beam 4 to form the upper structure floor slab 3 and the upper structure beam 4. Among them, the formwork of the cantilevered part 301 of the upper structure floor slab adopts a right-angle flanged aluminum formwork 12, and is matched with a steel structure column bracket 5. When removing the formwork, other working surface support structures inside the floor can be removed first, and then the extended column bracket 5 and aluminum formwork 12 can be removed. This does not affect the entry and exit of the removed materials, and ensures that the structural strength of the cantilevered plate fully reaches 100% of the design strength, and can also improve the molding quality of the cantilevered concrete on the edge.

[0079] By adopting the above-mentioned formwork method, the formwork of the upper structure floor 3 and the upper structure beam 4 is supported by setting up column supports 5, horizontal cross bar supports 6 and bottom ribs 7. Compared with the method of arranging full-floor formwork frames, the workload is less, the passage space is increased, and the force of the formwork frames is not supported on the cantilevered part 301 of the upper structure floor, but supported on the beam instead, thereby reducing the risk of high-altitude operations near the edge and improving the molding quality of the cantilevered concrete near the edge.

[0080] The present invention arranges column brackets 5 at the connection points between the lower structure floor 1 and the structural beam, so that the column brackets 5 are set back on the beam instead of being set on the cantilevered part of the lower structure floor 1, thereby avoiding the need to place vertical poles on the cantilevered plate when using full-floor brackets, reducing the stress on the cantilevered plate structure of the floor, avoiding construction risks, and increasing the safe space distance for edge operations. The column brackets 5 are adopted to increase the construction space (horizontal and vertical) distance, facilitate material transportation operations, reduce the workload of disassembly and assembly of full-floor formwork, increase the edge working space, reduce the risk of high-altitude operations on the edge, and improve the molding quality of edge cantilever concrete.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A large-span cantilever slab edge formwork device, characterized in that: It comprises a column support (5) arranged on a lower structure floor (1), a lower structure beam (2) is connected below the lower structure floor (1), and the bottom of the column support (5) is connected to a position on the lower structure floor (1) corresponding to the lower structure beam (2); The column bracket (5) is used to support the formwork of the upper structure floor (3) and the formwork of the upper structure beam (4) connected below the upper structure floor (3); The top of the column bracket (5) is connected to a horizontal crossbar bracket (6), the horizontal crossbar bracket (6) is in contact with the template of the upper structure beam (4), and a diagonal brace (8) is connected between the horizontal crossbar bracket (6) and the column bracket (5); A slab bottom secondary rib (7) is provided between the horizontal cross bar bracket (6) and the template of the upper structure floor slab (3), the bottom of the slab bottom secondary rib (7) is connected to the top surface of the horizontal cross bar bracket (6), and the top of the slab bottom secondary rib (7) is in contact with the bottom surface of the template of the upper structure floor slab (3); The column bracket (5) comprises at least two column segments, and adjacent column segments are slidably sleeved; A plurality of the bottom ribs (7) are provided between the horizontal crossbar support (6) and the template of the upper structure floor (3), and at least one of the bottom ribs (7) is supported at the edge of the template of the upper structure floor (3).

2. The large-span cantilever slab edge formwork device according to claim 1, characterized in that: The bottom secondary rib (7) of the plate is in an I-shape, and comprises an upper flange plate (701), a lower flange plate (702) and a web plate (703) located therebetween, the upper flange plate (701) abuts against the bottom surface of the formwork of the upper structure floor (3), and the lower flange plate (702) is connected to the horizontal crossbar bracket (6) by bolts.

3. The large-span cantilever slab edge formwork device according to claim 1, characterized in that: The column segment is provided with an adjustment hole (11), and a bolt is installed in the adjustment hole (11).

4. The large-span cantilever slab edge formwork device according to claim 3, characterized in that: A pad (9) is connected to the bottom of the column bracket (5), and the pad (9) is connected to the lower structure floor (1) via bolts.

5. The large-span cantilever slab edge formwork device according to any one of claims 1 to 4, characterized in that: The column bracket (5) is a steel structure.

6. The large-span cantilever slab edge formwork device according to claim 1, characterized in that: A tensile and compressive column (10) is also connected between one end of the horizontal crossbar support (6) and the lower structural floor (1), and the tensile and compressive column (10) is farther from the edge of the lower structural floor (1) than the column support (5).

7. The large-span cantilever slab edge formwork device according to claim 1, characterized in that: The template of the cantilevered portion of the upper structure floor (3) adopts an aluminum template (12).

8. The large-span cantilever slab edge formwork device according to claim 2, characterized in that: The horizontal crossbar bracket (6) comprises two groups of angle steels arranged parallel to each other, the tops of the two groups of angle steels are connected by a connecting plate, and the lower flange plate (702) is connected to the connecting plate and the angle steel by bolts.

9. A method for supporting the edge of a large-span cantilever slab, characterized in that: The large-span cantilever slab edge formwork device according to any one of claims 1 to 8 is used to formwork the upper structure floor (3) and the upper structure beam (4), wherein the upper structure beam (4) is connected below the upper structure floor (3), comprising the following steps: Step 1: erecting a column support (5) on a lower structural floor (1), wherein a lower structural beam (2) is connected below the lower structural floor (1), and arranging the column support (5) at a position corresponding to the lower structural beam (2); Step 2: Install a horizontal cross bar support (6) on the top of the column support (5), and connect a diagonal brace (8) between the horizontal cross bar support (6) and the column support (5); Step 3: Installing the bottom rib (7) of the board above the horizontal crossbar support (6), wherein the installation position of the bottom rib (7) of the board avoids the installation position of the template of the upper structure beam (4); Step 4: Lay the templates for the upper structure floor (3) and the upper structure beam (4), tie the steel bars in the templates, and then pour concrete.

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