Cantilever steel support suitable for being arranged on concrete structure and construction method

Abstract

The invention discloses a cantilever steel support suitable for being arranged on a concrete structure and a construction method. The cantilever steel support comprises a cross beam assembly connected with the concrete structure, and the concrete structure is further provided with a horizontal inclined strut assembly and a vertical inclined strut assembly which are connected with the cross beam assembly. Wherein the cross beam assembly comprises a profile steel cross beam connected with a concrete structure and a steel corbel, the steel corbel is used for supporting the profile steel cross beam, the horizontal diagonal bracing assembly comprises horizontal diagonal bracing pipes arranged on the two sides of the profile steel cross beam, and the vertical diagonal bracing assembly comprises vertical diagonal bracing pipes connected with the bottom of the profile steel cross beam. Displacement outside the plane of the inclined strut is limited, safety and reliability of the support are enhanced, the probability that the steel support is damaged is greatly reduced, it is guaranteed that a building can effectively provide a preset use function for a long time, temporary vertical support is provided after hoisting in place through the arranged steel corbel, interference of wind is reduced, and the service life of the building is prolonged. And the difficulty and time of on-site welding construction are effectively reduced.

Description

Technical Field

[0001] This invention belongs to the field of cantilever steel support technology, and particularly relates to a cantilever steel support suitable for installation on concrete structures and a construction method thereof. Background Technology

[0002] Currently, most ordinary factory buildings are composed of both concrete and steel structures. Concrete structures, with their advantages of good integrity, fire resistance and durability, low cost and safety, are often used in dormitories, laboratory buildings, large warehouses and production frames with low height. Steel structures, on the other hand, with their advantages of being lightweight and high-strength, having strong spanning capacity and a high degree of prefabricated construction, are often used in belt conveyors, auxiliary production platforms, canopies and frames with greater height.

[0003] However, due to the complex process flow and numerous equipment in industrial plants, there are a large number of steel structure structures such as maintenance platforms, aerial access platforms, and conveyor trusses. Moreover, in order to make the space look clean and simple and not affect the building's functionality, many steel structure support columns cannot be directly grounded and need to be set up on nearby reliable concrete structures as the support points of the steel structure.

[0004] In existing technologies, during concrete construction, two steel structure embedded parts are often set on the concrete structure, one above the other. After the concrete structure reaches the design strength, the H-shaped steel beam and the square steel pipe diagonal brace are welded together to form a triangular brace structure. Stiffening plates are set at the connection points. After the triangular brace is hoisted to the installation position, the H-shaped steel beam is welded to the upper embedded part and the square steel pipe is welded to the lower embedded part to form a triangular brace as the support point of the steel structure. During the construction of the steel structure, the supported steel structure can be hoisted and welded to the triangular brace.

[0005] However, with existing technology, two of the three connection nodes of the triangular brace are welded on-site, and this is overhead welding. Due to the inferior performance of on-site welding equipment compared to the factory, and the difficulty of high-altitude welding, the on-site welding quality is far inferior to that of the factory. This may result in the welding quality failing to meet design standards, and even lead to safety hazards such as insufficient weld height. Furthermore, since the triangular brace is pre-assembled in the factory, after hoisting into place, inaccurate material cutting or deviations in the position of the concrete embedded parts may prevent the crossbeam and diagonal brace from being welded to the embedded parts simultaneously. If the factory has to re-cut and manufacture the materials, it will seriously affect the on-site construction period. If on-site splicing and welding is required, it will be difficult to guarantee structural safety. At the same time, although the triangular brace is a stable triangular system in the plane, it is a swinging system without any support points outside the plane. If the components are not accurately installed during manufacturing and installation, the support will be at risk of out-of-plane instability during the operation phase. Summary of the Invention

[0006] The purpose of this invention is to overcome the defects of the prior art by providing a cantilevered steel support and construction method suitable for installation on concrete structures. This invention restricts the displacement outside the plane of the diagonal brace, enhances the safety and reliability of the support, significantly reduces the probability of steel support failure, and ensures that the building can provide its intended function for a long time. The steel brackets provide temporary vertical support after hoisting into place, reduce wind interference, and effectively reduce the difficulty and time of on-site welding construction.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] A cantilevered steel support suitable for installation on a concrete structure includes a beam assembly connected to the concrete structure, and the concrete structure is further provided with a horizontal diagonal brace assembly and a vertical diagonal brace assembly connected to the beam assembly.

[0009] The beam assembly includes a steel beam connected to the concrete structure and a steel bracket, the steel bracket being used to support the steel beam. The horizontal bracing assembly includes horizontal bracing tubes disposed on both sides of the steel beam, and the vertical bracing assembly includes vertical bracing tubes connected to the bottom of the steel beam.

[0010] In one embodiment, the vertical bracing assembly further includes a lower bracing connector and an upper bracing connector passing through both ends of the vertical bracing tube. The lower bracing connector is connected to the concrete structure, and the upper bracing connector is connected to the steel beam.

[0011] In this embodiment, the vertical support is connected by the lower connector and the upper connector of the diagonal brace, changing the conventional overhead welding construction to the downward welding construction, which not only reduces the difficulty of welding construction, but also improves the reliability of the weld.

[0012] In one embodiment, the lower connector of the diagonal brace is connected to the concrete structure through a vertical diagonal brace embedded part, and the upper connector of the diagonal brace is connected to the steel beam through an upper pad plate of the diagonal brace. Both the lower connector of the diagonal brace and the upper connector of the diagonal brace have an arc-shaped section at one end near the steel beam.

[0013] In one embodiment, a sealing plate is provided at one end of the vertical bracing tube near the steel beam, and corresponding connection holes are provided on the vertical bracing tube and the upper connector of the bracing tube. A groove is also provided on the vertical bracing tube for the lower connector of the bracing tube and the upper connector of the bracing tube to pass through.

[0014] In one embodiment, the beam assembly further includes a beam connecting plate, which is connected to the concrete structure via an embedded part, and the beam connecting plate is connected to the upper flange of the steel beam.

[0015] In one embodiment, stiffening ribs are also provided at the web of the steel beam, and the steel bracket is connected to the concrete structure through bracket embedded parts.

[0016] In one embodiment, the horizontal bracing assembly further includes a horizontal bracing embedded part embedded in the concrete structure, which is larger than the horizontal bracing tube, so as to allow the horizontal bracing tube to be connected to the concrete structure.

[0017] In one embodiment, the vertical bracing assembly further includes a lower limiting plate and an upper limiting plate. The first straight section of the lower connecting member is connected to the lower limiting plate, and the end point of the first straight section is connected to the arc-shaped section of the lower connecting member at a 120° angle. The second straight section of the upper connecting plate is connected to the upper limiting plate, and the end point of the second straight section is connected to the arc-shaped section of the upper connecting member at a 120° angle.

[0018] The present invention also provides a construction method for the above-mentioned cantilever steel support, comprising the following steps:

[0019] Step S1: After bolting the vertical bracing tube to the upper connector of the bracing, install it at the bottom of the steel beam and hoist it to the installation position;

[0020] Step S2: Adjust the vertical bracing tube and weld it to the lower connector of the bracing tube;

[0021] Step S3: Weld the vertical bracing tube to the upper connecting plate of the bracing tube;

[0022] Step S4: Weld the steel crossbeam, steel bracket, and crossbeam connecting plate together;

[0023] Step S5: Weld both ends of the horizontal bracing pipe to the steel beam and the horizontal bracing embedded parts respectively.

[0024] This implementation method enables safer and faster construction of steel structures, transforming the overhead welding construction restricted by traditional structures into overhead welding construction, reducing the difficulty of welding construction, improving the reliability of welds, and strengthening the safety and reliability of the support from multiple dimensions, greatly reducing the probability of steel support failure, and ensuring that the building can provide its intended functions effectively for a long time.

[0025] In one embodiment, prior to step S1, the method further includes:

[0026] Step S0: Pre-embed corbels, connecting plate embeds, horizontal diagonal braces, and vertical diagonal braces in the concrete structure, and place the steel corbels on the corbels.

[0027] The beneficial effects of this invention are as follows:

[0028] (1) The displacement outside the plane of the diagonal bracing is restricted by two horizontal diagonal bracing tubes. The crossbeam connecting plate enhances the resistance of the weld to the internal force along the axial direction of the crossbeam. The added crossbeam steel bracket not only provides reliable vertical support for the support, but also provides temporary vertical support after hoisting into place, reducing wind interference and effectively reducing the difficulty and time of on-site welding construction. It strengthens the safety and reliability of the support from multiple dimensions, greatly reduces the probability of steel support failure, and ensures that the building can provide the intended use function for a long time.

[0029] (2) Most of the entire support can be pre-welded and assembled before hoisting, reducing on-site welding work at high altitudes. Before hoisting, the upper part of the vertical bracing component is pre-welded to the bottom of the crossbeam. The vertical bracing pipe and the upper connecting plate of the bracing are connected together by bolts for hoisting. After hoisting to the installation position, the vertical bracing pipe is rotated around the preset bolt holes to contact the lower part of the vertical bracing component that has been set in the concrete in advance. This ensures that each component is hoisted to the position before welding the vertical bracing pipe, the upper connecting plate of the bracing, and the lower connecting parts of the bracing together. This avoids the risk of repeatedly modifying the components and repeatedly hoisting after the vertical bracing pipe is pre-welded and hoisted to the installation position because it does not match the embedded parts. Attached Figure Description

[0030] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0031] Figure 1 This shows a schematic diagram of the structure of a cantilevered steel support in the prior art;

[0032] Figure 2 Showing Figure 1 A magnified schematic diagram of the partial structure at point A in the middle;

[0033] Figure 3 A schematic diagram of the cantilevered steel support structure of the present invention is shown;

[0034] Figure 4 This shows a structural schematic diagram of the cantilevered steel support of the present invention in another direction;

[0035] Figure 5 Showing Figure 3 A magnified schematic diagram of the partial structure at point A in the middle;

[0036] Figure 6 Showing Figure 5 Schematic diagram of the cross-sectional structure at point AA;

[0037] Figure 7 Showing Figure 3 A magnified schematic diagram of the local structure at point B;

[0038] Figure 8 Showing Figure 7 Schematic diagram of the cross-sectional structure at point BB;

[0039] Figure 9 Showing Figure 3 A magnified schematic diagram of the local structure at point C;

[0040] Figure 10 Showing Figure 9 A schematic diagram of the cross-sectional structure at the CC section;

[0041] Figure 11 A schematic diagram of the steel bracket of the present invention is shown;

[0042] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not to scale.

[0043] Figure label:

[0044] 101-Concrete structure, 201-Steel beam, 202-Stiffening rib, 203-Steel bracket, 204-Bracket embedded part, 205-Beam connecting plate, 206-Connecting plate embedded part, 301-Horizontal brace pipe, 302-Horizontal brace embedded part, 401-Vertical brace pipe, 402-Vertical brace embedded part, 403-Lower connector of brace, 404-Lower limiting plate of brace, 405-Upper pad of brace, 406-Upper connector of brace, 407-Upper limiting plate of brace. Detailed Implementation

[0045] The invention will now be further described with reference to the accompanying drawings.

[0046] Traditional cantilever steel supports, such as Figure 1 and Figure 2 As shown, during concrete construction, two steel structure embedded parts are set on the concrete structure. After the concrete structure reaches the design strength, the H-shaped steel beam and square steel pipe diagonal brace are welded together to form a triangular brace structure. Stiffening plates are set at the connection points. After the triangular brace is hoisted to the installation position, the H-shaped steel beam is welded to the upper embedded part and the square steel pipe is welded to the lower embedded part to form a triangular brace as the support point of the steel structure. However, on the one hand, two of the three connection nodes of the triangular brace are welded on site and are overhead welded. Since the performance of the on-site welding equipment is not as good as that of the factory and the high-altitude welding construction is difficult, the on-site welding quality is far inferior to that of the factory. This may result in the welding quality not meeting the design standards and even the safety hazard of insufficient weld height. On the other hand, although the triangular brace is a stable triangular system in the plane, it is a swinging system without any support points outside the plane. If the components are not accurately installed during manufacturing and installation, the support will be at risk of out-of-plane instability during the operation phase.

[0047] This invention provides a cantilevered steel support suitable for installation on a concrete structure 101, such as... Figures 3 to 6 as well as Figure 11 As shown, it includes a beam assembly connected to a concrete structure 101, and the concrete structure 101 is also provided with a horizontal bracing assembly and a vertical bracing assembly connected to the beam assembly.

[0048] The beam assembly includes a steel beam 201 connected to the concrete structure 101 and a steel bracket 203. The steel bracket 203 is used to support the steel beam 201. The horizontal bracing assembly includes horizontal bracing tubes 301 arranged on both sides of the steel beam 201. The vertical bracing assembly includes vertical bracing tubes 401 connected to the bottom of the steel beam 201.

[0049] It should be noted that by adding two horizontal diagonal bracing tubes 301, the displacement outside the plane of the diagonal bracing is restricted. The addition of the crossbeam steel bracket 203 not only provides reliable vertical support for the support, but also provides temporary vertical support after hoisting into place, reducing wind interference and effectively reducing the difficulty and time of on-site welding construction. It enhances the safety and reliability of the support from multiple dimensions, greatly reduces the probability of steel support failure, and ensures that the building can provide its intended functions effectively for a long time.

[0050] Specifically, in this embodiment, the steel beam 201 is made of H-beam, and the cross-sectional size of the beam is designed and selected according to the load transmitted from the upper steel structure. The steel bracket 203 is a general-purpose steel bracket 203 composed of a top plate, a bottom plate and a web plate.

[0051] In one embodiment, such as Figure 7 and Figure 9 As shown, the vertical bracing assembly also includes a lower bracing connector 403 and an upper bracing connector 406 that pass through both ends of the vertical bracing tube 401. The lower bracing connector 403 is connected to the concrete structure 101, and the upper bracing connector 406 is connected to the steel beam 201.

[0052] It should be noted that the vertical support pipe is connected by the lower connector 403 and the upper connector 406 of the diagonal brace, which changes the conventional overhead welding construction to the downward welding construction, which not only reduces the difficulty of welding construction, but also improves the reliability of the weld.

[0053] In one embodiment, such as Figures 7 to 10As shown, the lower connector 403 of the diagonal brace is connected to the concrete structure 101 through the vertical diagonal brace embedded part 402, and the upper connector 406 of the diagonal brace is connected to the steel beam 201 through the upper pad 405 of the diagonal brace. Both the lower connector 403 and the upper connector 406 of the diagonal brace have an arc-shaped section at one end near the steel beam 201. A sealing plate is provided at one end of the vertical diagonal brace tube 401 near the steel beam 201. Corresponding connection holes are provided on the vertical diagonal brace tube 401 and the upper connector 406 of the diagonal brace. The vertical diagonal brace tube 401 also has a connection for the diagonal brace. The lower connector 403 and the upper connector 406 of the diagonal brace pass through the groove. The vertical diagonal brace assembly also includes a lower limiting plate 404 and an upper limiting plate 407 of the diagonal brace. The first straight section of the lower connector 403 of the diagonal brace is connected to the lower limiting plate 404 of the diagonal brace. The end point of the first straight section is connected to the arc-shaped section of the lower connector 403 of the diagonal brace at an angle of 120°. The second straight section of the upper connector 406 of the diagonal brace is connected to the upper limiting plate 407 of the diagonal brace. The end point of the second straight section is connected to the arc-shaped section of the upper connector 406 of the diagonal brace at an angle of 120°.

[0054] It should be noted that most of the entire support structure can be pre-welded and assembled before hoisting, reducing on-site welding work at height. Before hoisting, the upper part of the vertical bracing component is pre-welded to the bottom of the crossbeam. The vertical bracing pipe 401 and the upper connecting plate of the bracing are connected together by bolts for hoisting. After hoisting to the installation position, the vertical bracing pipe 401 is rotated around the preset bolt holes to contact the lower part of the vertical bracing component that has been set in the concrete in advance. After ensuring that each component is in place, the vertical bracing pipe 401 is welded together with the upper connecting plate of the bracing and the lower connecting part of the bracing 403. This avoids the risk of repeatedly modifying the components and hoisting after the vertical bracing pipe 401 is pre-welded and hoisted to the installation position because it does not match the embedded parts.

[0055] In one embodiment, such as Figures 7 to 10As shown, the vertical bracing pipe 401 is made of square steel pipe and is mainly used to support the steel beam 201, bearing the vertical load transmitted from the upper part. A 6mm thick sealing plate is installed on the upper part of the vertical bracing pipe 401. A bolt hole with a diameter of 22mm is pre-installed at the center line position 50mm away from the sealing plate. Holes are also opened at the center line on the other side of both ends of the square steel pipe. The length is the calculated length of the weld + 100mm error adjustment length, and the width is the thickness of the lower and upper connecting plates of the bracing pipe + 2mm, so as to allow the lower and upper connecting plates of the bracing pipe to be inserted. The vertical bracing embedded part 402 is larger than the cross-sectional size of the vertical bracing pipe 401. The vertical bracing embedded part 402 is pre-installed on the concrete. The lower connecting part 403 and the upper connecting part of the bracing pipe are also included. The thickness of the connecting plate is determined by calculation. Both are made along the direction of the vertical bracing tube 401 with an arc of radius 200mm. When the left arc of the lower connecting piece 403 of the bracing connects to the horizontal line, it becomes a straight line and connects to the left vertical straight line. The total height of the connecting piece is the width of the vertical bracing tube 401 + 200mm. The lower width is 200mm. The edge line of the width endpoint plate connects to the right arc at an angle of 120°. When the left arc of the upper connecting plate of the bracing connects to the vertical straight line, it becomes a straight line. The length of the connecting plate is the width of the vertical bracing tube 401 + 200mm. The right width is 200mm. The edge line of the right width endpoint plate connects to the left arc at an angle of 120°. D22mm bolt holes are drilled at the corresponding positions of the openings in the vertical bracing tube 401.

[0056] In one embodiment, the thickness of the upper pad 405 of the diagonal brace is the same as the flange thickness of the steel beam 201, and the width of the upper pad 405 of the diagonal brace is greater than the flange of the steel beam 201 and the vertical diagonal brace tube 401.

[0057] In one embodiment, such as Figure 3 and Figure 5 As shown, the beam assembly also includes a beam connecting plate 205, which is connected to the concrete structure 101 via a connecting plate embedded part 206, and is connected to the upper flange of the steel beam 201.

[0058] It should be noted that the crossbeam connecting plate 205 enhances the weld seam resisting the axial internal force along the crossbeam, further strengthening the safety and reliability of the support from multiple dimensions. The width of the crossbeam connecting plate 205 is smaller than the flange width of the steel crossbeam 201, the length is 100-200mm, and the thickness is 6-14mm. It is used to connect the upper flange of the steel crossbeam 201. The width of the connecting plate embedded part 206 is the width of the steel crossbeam 201 plus 100mm, and the length is the same as the width. It is set in advance on the concrete structure 101 to set the crossbeam connecting plate 205 on the concrete.

[0059] In one embodiment, the web of the steel beam 201 is also provided with stiffening ribs 202, the steel bracket 203 is connected to the concrete structure 101 through the bracket embedded part 204, and the horizontal bracing assembly also includes a horizontal bracing embedded part 302 embedded in the concrete structure 101, which is larger than the horizontal bracing tube 301 so that the horizontal bracing tube 301 can be connected to the concrete structure 101.

[0060] In one embodiment, the present invention also provides a construction method for a cantilevered steel support, comprising the following steps:

[0061] Step S0: Pre-embed corbel embedded parts, connecting plate embedded parts, horizontal diagonal brace embedded parts and vertical diagonal brace embedded parts in the concrete structure, and set the steel corbel on the corbel embedded parts;

[0062] Step S1: After bolting the vertical bracing tube to the upper connector of the bracing, install it at the bottom of the steel beam and hoist it to the installation position;

[0063] Step S2: Adjust the vertical bracing tube and weld it to the lower connector of the bracing tube;

[0064] Step S3: Weld the vertical bracing tube to the upper connecting plate of the bracing tube;

[0065] Step S4: Weld the steel crossbeam, steel bracket, and crossbeam connecting plate together;

[0066] Step S5: Weld both ends of the horizontal bracing pipe to the steel beam and the horizontal bracing embedded parts respectively.

[0067] It should be noted that in this construction method, based on the structural characteristics of the cantilevered steel support, the traditional overhead welding construction is changed to downward welding construction, which reduces the difficulty of welding construction and improves the reliability of the weld. At the same time, most of the entire support can be pre-welded and assembled before hoisting, reducing on-site welding work at high altitudes. Before hoisting, the upper part of the vertical bracing component is pre-welded to the bottom of the crossbeam. The vertical bracing pipe and the upper connecting plate of the bracing are connected together by bolts for hoisting. After hoisting to the installation position, the vertical bracing pipe is rotated around the preset bolt holes to contact the lower part of the vertical bracing component that has been set in the concrete in advance. After ensuring that each component is in place, the vertical bracing pipe is then welded together with the upper connecting plate of the bracing and the lower connecting part of the bracing. This avoids the risk of repeatedly modifying the components and hoisting repeatedly after the vertical bracing pipe is pre-welded and hoisted to the installation position because it does not match the embedded parts.

[0068] In the description of this invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0069] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A cantilever steel bracket suitable for being set on a concrete structure, characterized in that: It includes a crossbeam assembly connected to a concrete structure, and the concrete structure is also provided with a horizontal diagonal brace assembly and a vertical diagonal brace assembly connected to the crossbeam assembly; Among them, the crossbeam assembly includes a steel crossbeam and a steel corbel connected to the concrete structure, the steel corbel is used to support the steel crossbeam, the horizontal diagonal brace assembly includes horizontal diagonal brace tubes arranged on both sides of the steel crossbeam, and the vertical diagonal brace assembly includes a vertical diagonal brace tube connected to the bottom of the steel crossbeam.

2. A cantilever steel bracket suitable for being installed on a concrete structure according to claim 1, characterized in that: The vertical diagonal brace assembly also includes a diagonal brace lower connecting piece and a diagonal brace upper connecting piece which are passed through the two ends of the vertical diagonal brace tube. The diagonal brace lower connecting piece is connected to the concrete structure, and the diagonal brace upper connecting piece is connected to the steel beam.

3. The cantilever steel bracket suitable for being installed on a concrete structure according to claim 2, characterized in that: The lower connecting piece of the diagonal brace is connected to the concrete structure through a vertical diagonal brace embedded piece, and the upper connecting piece of the diagonal brace is connected to the steel beam through an upper pad of the diagonal brace. The lower connecting piece of the diagonal brace and the upper connecting piece of the diagonal brace both have an arc section at one end close to the steel beam.

4. The cantilever steel bracket suitable for being installed on a concrete structure according to claim 2, characterized in that: A sealing plate is provided at one end of the vertical diagonal brace tube close to the steel beam, and corresponding connecting holes are provided on the vertical diagonal brace tube and the diagonal brace upper connecting piece. The vertical diagonal brace tube is also provided with a groove for the diagonal brace lower connecting piece and the diagonal brace upper connecting piece to penetrate.

5. The cantilever steel bracket suitable for being installed on a concrete structure according to claim 1, characterized in that: The crossbeam assembly also includes a crossbeam connecting plate, which is connected to the concrete structure via a connecting plate embedded part, and the crossbeam connecting plate is connected to the upper flange of the steel crossbeam.

6. The cantilever steel bracket suitable for being installed on a concrete structure according to claim 1, characterized in that: The web of the steel beam is also provided with stiffening ribs, and the steel corbel is connected to the concrete structure via corbel embedded parts.

7. The cantilever steel bracket suitable for being installed on a concrete structure according to claim 1, characterized in that: The horizontal diagonal brace assembly also includes a horizontal diagonal brace embedded part embedded in the concrete structure, the size of which is larger than the horizontal diagonal brace pipe so that the horizontal diagonal brace pipe is connected to the concrete structure.

8. The cantilever steel bracket suitable for being installed on a concrete structure according to claim 3, characterized in that: The vertical diagonal brace assembly also includes a diagonal brace lower limit plate and a diagonal brace upper limit plate. The first straight section of the diagonal brace lower connecting member is connected to the diagonal brace lower limit plate, and the end point of the first straight section is connected to the arc section of the diagonal brace lower connecting member at an angle of 120°. The second straight section of the diagonal brace upper connecting plate is connected to the diagonal brace upper limit plate, and the end point of the second straight section is connected to the arc section of the diagonal brace upper connecting member at an angle of 120°.

9. A construction method for a cantilever steel support, based on the cantilever steel support suitable for being arranged on a concrete structure according to any one of claims 1 to 8, characterized in that: The steps include: Step S1, bolt the vertical diagonal brace pipe to the upper connecting piece of the diagonal brace and install it at the bottom of the steel beam, and hoist it to the installation position; Step S2, adjusting the vertical diagonal brace tube and welding it to the lower connecting piece of the diagonal brace; Step S3, welding the vertical diagonal brace tube and the diagonal brace upper connecting plate together; Step S4, welding the steel beam, the steel bracket and the beam connecting plate together; Step S5, welding the two ends of the horizontal diagonal brace pipe to the steel beam and the horizontal diagonal brace embedded parts respectively.

10. The construction method of a cantilever steel support according to claim 9, characterized in that: Before step S1, the method further includes: Step S0, pre-embed corbel embedded parts, connecting plate embedded parts, horizontal diagonal brace embedded parts and vertical diagonal brace embedded parts on the concrete structure, and set the steel corbel on the corbel embedded parts.

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