Cantilever beam construction and installation method and novel cantilever beam structure

Abstract

The invention provides a cantilever beam construction and installation method and a novel cantilever beam structure.The cantilever beam construction and installation method comprises the following steps that a floor slab is chiseled away, and a column head surrounding steel plate, an upper annular plate, a lower annular plate and a beam head side wall steel plate are welded to one another, surround the intersection portion of a column body and a plurality of concrete beams and are welded to reinforcing steel bars of the floor slab; a gap between the steel plate and concrete is densely filled with grouting materials, so that the structural strength of the connecting end of the cantilever steel beam is greatly enhanced, the cantilever steel beam is installed on the column head surrounding steel plate through the lug plates, the rectangular connecting plates and the high-strength bolts, the structure is stable, the construction technology is simple, no chemical adhesive is needed, and the construction cost is reduced. The risk of anchoring failure in a long-term load state is avoided; secondly, steel bars or chemical anchor bolts need to be planted on the beam columns, and the situation that construction is affected due to dense steel bars in a beam column joint area is avoided; and finally, the process is standardized in operation, the construction process is slightly influenced by human factors, and the construction quality is effectively guaranteed.

Description

Technical Field

[0001] The invention relates to the field of construction, and in particular to a cantilever beam construction and installation method and a novel cantilever beam structure. Background Art

[0002] In the renovation of existing buildings, it is often necessary to add cantilever beams and slabs due to the functional requirements of the building. The method of fixing the cantilever beams is crucial and is related to the safety of the building and our lives. The usual methods for adding cantilever beams are: 1. Implanting the load-bearing longitudinal reinforcement of the cantilever beam in the existing beam-column node area, and then pouring the reinforced concrete cantilever beam; this method adopts the method of adding reinforced concrete beams, and the load-bearing reinforcement is the method of embedded reinforcement; 2. Anchor plates are set up in the existing beam-column node area by embedded reinforcement or chemical anchor bolts, and then new steel cantilever beams are added to the anchor plates; this method is to set anchor plates, then add new steel beams, and the anchor plates are fixed by embedded reinforcement or chemical anchor bolts.

[0003] There are the following problems when adding cantilever beams using the above methods: 1. Chemical adhesives are used, and there is a possibility of anchor failure under long-term load conditions; 2. The construction process of embedded steel bars or chemical anchors is very critical, and human influence factors are inevitable; 3. The steel bars in the beam-column node area are dense, and it is difficult to drill holes when embedding steel bars or chemical anchors. Summary of the invention

[0004] The main purpose of the present invention is to provide a cantilever beam construction and installation method and a new cantilever beam structure, so as to at least solve the problems in the prior art of newly added cantilever beams being easy to anchor under long-term load conditions, having large human influence factors in the construction process, and having difficulty in drilling holes during the construction of embedded steel bars or chemical anchors.

[0005] In order to achieve the above-mentioned purpose, according to the first aspect of the present invention, a cantilever beam construction and installation method is provided, comprising the following steps: chiseling away the side of the column corresponding to the position where the cantilever beam structure is to be added and the floor slabs on both sides of the concrete beam to expose the concrete beam; welding a column head surrounding steel plate at the intersection of the column and the concrete beam; welding and installing an upper ring plate and a lower ring plate on the column head surrounding steel plate, and ensuring that the lower surface of the upper ring plate abuts against the upper surface of the concrete beam and the upper surface of the lower ring plate abuts against the lower surface of the concrete beam; welding multiple pairs of beam head side wall steel plates between the upper ring plate and the lower ring plate, and ensuring that Each pair of beam head side wall steel plates are located on both sides of the concrete beam; ear plates are welded on the outer wall of the column head sleeve steel plate, and the upper and lower ends of the ear plates are welded correspondingly to the upper ring plate and the lower ring plate; the gaps between the column head sleeve steel plate, the upper ring plate, the lower ring plate and the beam head side wall steel plate and the concrete in the node area between the column and the concrete beam are filled and compacted with grouting material; the cantilever steel beam is fixedly installed on the ear plate by a rectangular connecting plate and high-strength bolts, and the cantilever steel beam is extended outward in the direction away from the column head sleeve steel plate; the chiseled floor slab reinforcement is welded to the steel plate and the chiseled part of the floor slab is repaired with grouting material.

[0006] Furthermore, when chiseling away the floor slabs on the sides of the column and the concrete beams, the floor slab reinforcements are retained and the outer concrete surfaces of the column and concrete beam node areas are roughened.

[0007] Furthermore, when welding the column head surrounding steel plate, multiple steel plates are used for welding, and beam holes are reserved on the side walls of the column head surrounding steel plate so that the concrete beam can pass through the beam holes.

[0008] Furthermore, when the upper ring plate and the lower ring plate are welded and installed on the column head surrounding steel plate, the upper ring plate and the lower ring plate are formed by splicing a plurality of steel plates.

[0009] Furthermore, when welding multiple pairs of beam head side wall steel plates between the upper ring plate and the lower ring plate, the upper ends of each pair of beam head side wall steel plates are correspondingly welded to the two sides of the extension plate of the upper ring plate, and the lower ends of each pair of beam head side wall steel plates are correspondingly welded to the two sides of the extension plate of the lower ring plate.

[0010] According to a second aspect of the present invention, a novel cantilever beam structure is provided, which is constructed by the above-mentioned construction and installation method, and the cantilever beam structure comprises: a column head surrounding steel plate, which is fixedly sleeved at the intersection of the column and multiple concrete beams; an upper ring plate, which is sleeved and welded on the column head surrounding steel plate, and the lower surface of the upper ring plate abuts against the upper surface of the concrete beam; a lower ring plate, which is sleeved and welded on the column head surrounding steel plate, and the upper surface of the lower ring plate abuts against the lower surface of the concrete beam; a beam head side wall steel plate There are multiple pairs of side wall steel plates at the beam head, and each pair of side wall steel plates at the beam head is arranged on both sides of a concrete beam. The upper and lower ends of the side wall steel plates at the beam head are welded to the upper ring plate and the lower ring plate respectively; the ear plate is welded to the outer wall of the column head sleeve steel plate, and the upper and lower ends of the ear plate are welded to the upper ring plate and the lower ring plate respectively, and mounting screw holes are opened on the ear plate; the cantilever steel beam, the end of the cantilever steel beam is fixed to the bolt holes of the ear plate through a rectangular connecting plate and high-strength bolts and extends outward in the direction away from the column head sleeve steel plate.

[0011] Furthermore, a plurality of beam holes are provided on the side wall of the column head surrounding steel plate, and a plurality of concrete beams pass through the plurality of beam holes correspondingly.

[0012] Furthermore, the upper ring plate and the lower ring plate both include an annular connecting plate and multiple extension plates. The annular connecting plate is sleeved and welded on the column head surrounding steel plate. One end of the multiple extension plates is welded to the annular connecting plate, and the other end of the multiple extension plates extends along the direction of the concrete beam and abuts against the concrete beam.

[0013] Furthermore, the upper ends of each pair of beam head side wall steel plates are correspondingly welded to both sides of the extension plate of the upper ring plate, and the lower ends of each pair of beam head side wall steel plates are correspondingly welded to both sides of the extension plate of the lower ring plate.

[0014] Furthermore, the column head surrounding steel plate, the upper ring plate and the lower ring plate are all formed by splicing a plurality of steel plates.

[0015] The cantilever beam construction and installation method of the technical solution of the present invention comprises the following steps: chiseling away the side of the column body corresponding to the position where the cantilever beam structure is to be added and the floor slabs on both sides of the concrete beam to expose the concrete beam; welding the column head surrounding steel plate at the intersection of the column body and the concrete beam; welding and installing the upper ring plate and the lower ring plate on the column head surrounding steel plate, and ensuring that the lower surface of the upper ring plate abuts against the upper surface of the concrete beam and the upper surface of the lower ring plate abuts against the lower surface of the concrete beam; welding multiple pairs of beam head side wall steel plates between the upper ring plate and the lower ring plate, and ensuring that each pair of beam head side wall steel plates is positioned On both sides of the concrete beam; weld ear plates on the outer wall of the column head steel plate, and ensure that the upper and lower ends of the ear plates are welded to the upper ring plate and the lower ring plate in correspondence; use grouting material to fill the gaps between the column head steel plate, the upper ring plate, the lower ring plate and the steel plate of the side wall of the beam head and the concrete in the node area between the column and the concrete beam; fix the cantilever steel beam on the ear plates through rectangular connecting plates and high-strength bolts and ensure that the cantilever steel beam extends outward in the direction away from the column head steel plate; weld the chiseled floor slab steel bars to the steel plate and repair the chiseled part of the floor slab with grouting material. The floor slab is chiseled off and the column head steel plate, upper ring plate, lower ring plate and beam head side wall steel plate are welded to each other and enclosed at the intersection of the column and multiple concrete beams and welded to the steel bars of the floor slab. The gap between the steel plate and the concrete is filled with grouting material to densely strengthen the structural strength of the connection end of the cantilever steel beam. The cantilever steel beam is then installed on the column head steel plate through ear plates, rectangular connecting plates and high-strength bolts. Not only is the structure stable and the construction process simple, but there is no need to use chemical adhesives, thus avoiding the risk of anchor failure under long-term load conditions. Secondly, it is necessary to plant reinforcement or chemical anchors on the beams and columns to avoid dense reinforcement in the beam-column node area, which affects the construction. Finally, the process is standardized and the construction process is less affected by human factors, which effectively ensures the construction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 This is a structural schematic diagram of step 1 of a cantilever beam construction and installation method that can be selected according to an embodiment of the present invention;

[0018] Figure 2 It is a structural schematic diagram of step 2 of a cantilever beam construction and installation method which can be selected according to an embodiment of the present invention;

[0019] Figure 3 is a structural schematic diagram of step three of a cantilever beam construction and installation method that can be selected according to an embodiment of the present invention;

[0020] Figure 4It is a structural schematic diagram of step 4 of a cantilever beam construction and installation method which can be selected according to an embodiment of the present invention;

[0021] Figure 5 is a structural schematic diagram of step five of a cantilever beam construction and installation method that can be selected according to an embodiment of the present invention;

[0022] Figure 6 is a structural schematic diagram of step six of a cantilever beam construction and installation method that can be selected according to an embodiment of the present invention;

[0023] Figure 7 is a structural schematic diagram of step seven of a cantilever beam construction and installation method that can be selected according to an embodiment of the present invention;

[0024] Figure 8 It is a structural schematic diagram of step eight of a cantilever beam construction and installation method that can be selected according to an embodiment of the present invention.

[0025] The above drawings include the following reference numerals:

[0026] 10. Steel plate around column head; 20. Upper ring plate; 30. Lower ring plate; 40. Steel plate for beam head side wall; 50. Ear plate; 60. Cantilever steel beam; 70. Rectangular connecting plate; 80. High-strength bolts; 90. Ring connecting plate; 100. Extension plate; 110. Column; 120. Concrete beam. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] The first embodiment of the present invention provides a cantilever beam construction and installation method, comprising the following steps:

[0029] S102: Figure 1 As shown, the side of the column 110 corresponding to the position where the cantilever beam structure is to be added and the floor slabs on both sides of the concrete beam 120 are chiseled out to expose the concrete beam 120;

[0030] S104: Figure 2 As shown, a column head steel plate 10 is welded at the intersection of the column 110 and the concrete beam 120;

[0031] S106: Figure 3 As shown, the upper ring plate 20 and the lower ring plate 30 are welded and installed on the column head surrounding steel plate 10, and it is ensured that the lower surface of the upper ring plate 20 abuts against the upper surface of the concrete beam 120 and the upper surface of the lower ring plate 30 abuts against the lower surface of the concrete beam 120;

[0032] S108: Figure 4As shown, multiple pairs of beam head side wall steel plates 40 are welded between the upper ring plate 20 and the lower ring plate 30, and each pair of beam head side wall steel plates 40 is ensured to be located on both sides of the concrete beam 120;

[0033] S110: Figure 5 As shown, the ear plate 50 is welded to the outer wall of the column head surrounding steel plate 10, and the upper end and the lower end of the ear plate 50 are welded to the upper ring plate 20 and the lower ring plate 30 correspondingly;

[0034] S112: Figure 6 As shown, the gaps between the column head steel plate 10, the upper ring plate 20, the lower ring plate 30, the beam head side wall steel plate 40 and the concrete at the node area between the column 110 and the concrete beam 120 are filled and compacted with grouting material; and the cantilever steel beam 60 is fixedly installed on the ear plate 50 by a rectangular connecting plate and high-strength bolts to ensure that the cantilever steel beam 60 extends outward in a direction away from the column head steel plate 10;

[0035] S114: Figure 7 and Figure 8 As shown, the chiseled floor slab reinforcement is welded to the steel plate and the chiseled portion of the floor slab is repaired with grouting material.

[0036] By chiseling off the floor slabs on both sides of the concrete beam 120 and welding the column head steel plate 10, the upper ring plate 20, the lower ring plate 30 and the beam head side wall steel plate 40 to each other and enclose them at the intersection of the column 110 and multiple concrete beams 120 and weld them to the steel bars of the floor slab, and then use grouting material to fill the gap between the steel plate and the concrete to densely strengthen the structural strength of the connecting end of the cantilever steel beam 60, and then install the cantilever steel beam 60 on the column head steel plate 10 through the ear plate 50, the rectangular connecting plate and the high-strength bolts. Not only is the structure stable, the construction process is simple, and there is no need to use chemical adhesives, avoiding the risk of anchor failure under long-term load conditions; secondly, there is no need to plant reinforcement or chemical anchor bolts on the beams and columns, avoiding dense reinforcement in the beam-column node area, which affects the construction; finally, the process is standardized, the construction process is less affected by human factors, and the construction quality is effectively guaranteed.

[0037] During the specific implementation, in step S102, when chiseling away the floor slabs on the sides of the column 110 and on both sides of the concrete beam 120, a gap of a preset width is chiseled in the floor slab along the side wall of the concrete beam 120, and the floor slab steel bars are retained so that the steel bars can be exposed from the chiseled gap, which is convenient for welding the steel bars to the steel plate in the subsequent process; that is, two gaps are chiseled correspondingly on both sides of the concrete beam 120, and at the same time, the outer surface of the concrete in the node area of ​​the column 110 and the concrete beam 120 is roughened, so that the grouting material can be better bonded to the surface of the column 110 and the concrete beam 120 when it is subsequently poured.

[0038] Furthermore, in step S104, when welding the column cap steel plate 10, multiple steel plates are used for welding, which can facilitate the processing and welding of the column cap steel plate 10 and reduce the construction difficulty; the specific number of steel plates used is based on the size of the floor gap and the need to avoid the column 110. The inner side wall length of the welded column cap steel plate 10 matches the side length of the column 110. At the same time, a beam hole is reserved on the side wall of the column cap steel plate 10 so that the concrete beam 120 passes through the beam hole.

[0039] Further, from the functional analysis, the upper ring plate 20 and the lower ring plate 30 both include an annular connecting plate 90 and a plurality of extension plates 100, the annular connecting plate 90 is a square annular plate structure, the inner hole size of the annular connecting plate 90 matches the side length of the column head sleeve steel plate 10, so as to be sleeved and welded on the column head sleeve steel plate 10, one end of the plurality of extension plates 100 is welded to the annular connecting plate 90, and the other end of the plurality of extension plates 100 extends in the direction of the concrete beam 120 and abuts against the concrete beam 120. In step S106, in actual application, when the upper ring plate 20 and the lower ring plate 30 are welded and installed on the column head sleeve steel plate 10, the upper ring plate 20 and the lower ring plate 30 are formed by splicing a plurality of steel plates; optionally, the upper ring plate 20 and the lower ring plate 30 can both be spliced ​​and enclosed from both sides of the column head sleeve steel plate 10 in two mutually symmetrical parts, so as to facilitate processing and installation welding.

[0040] Furthermore, in step S108, when welding multiple pairs of beam head side wall steel plates 40 between the upper ring plate 20 and the lower ring plate 30, the upper ends of each pair of beam head side wall steel plates 40 are correspondingly welded to the two sides of the extension plate 100 of the upper ring plate 20, and the lower ends of each pair of beam head side wall steel plates 40 are correspondingly welded to the two sides of the extension plate 100 of the lower ring plate 30, thereby enclosing and fastening the concrete beam 120 and effectively integrating it with the column head steel plate 10, thereby enhancing the strength and structural stability of the entire cantilever beam.

[0041] In step S110, when welding the ear plate 50, the rear side of the ear plate 50 is welded to the outer wall of the column head steel plate 10, and the upper and lower sides of the ear plate 50 are correspondingly welded to the upper ring plate 20 and the lower ring plate 30, so that the ear plate 50 can be stably connected from all directions, thereby improving the supporting force for the cantilever steel beam 60.

[0042] In step S112, filling the steel plate and the concrete in the node area with grouting material can prevent shaking caused by the gaps between the column head steel plate 10, the beam head side wall steel plate 40, the column 110 and the concrete beam 120, making the connection more stable.

[0043] In step S114 , the chiseled floor slab reinforcement is welded to the steel plate, so that the entire welded steel plate structure is connected to the floor slab reinforcement, further improving the strength and stability of the structure and increasing the support force for the cantilever steel beam 60 .

[0044] In order to achieve the above object, according to a second embodiment of the present invention, Figures 1 to 8 As shown, a novel cantilever beam structure is provided, including a column head sleeve steel plate 10, an upper ring plate 20, a lower ring plate 30, a beam head side wall steel plate 40, an ear plate 50 and a cantilever steel beam 60. The column head sleeve steel plate 10 is fixedly sleeved at the intersection of a column 110 and a plurality of concrete beams 120; the upper ring plate 20 and the lower ring plate 30 are sleeved and welded on the column head sleeve steel plate 10, the lower surface of the upper ring plate 20 abuts against the upper surface of the concrete beam 120; the upper surface of the lower ring plate 30 abuts against the lower surface of the concrete beam 120; the beam head side wall steel plate 40 is Multiple pairs, each pair of beam head side wall steel plates 40 are arranged on both sides of a concrete beam 120, and the upper and lower ends of the beam head side wall steel plates 40 are correspondingly welded to the upper ring plate 20 and the lower ring plate 30; the ear plate 50 is welded to the outer wall of the column head sleeve steel plate 10, and the upper and lower ends of the ear plate 50 are correspondingly welded to the upper ring plate 20 and the lower ring plate 30, and mounting screw holes are opened on the ear plate 50; the end of the cantilever steel beam 60 is fixed to the bolt hole of the ear plate 50 by a rectangular connecting plate 70 and a high-strength bolt 80 and extends outward in a direction away from the column head sleeve steel plate 10. The column head steel plate 10, the upper ring plate 20, the lower ring plate 30 and the beam head side wall steel plate 40 are welded to each other and enclosed at the intersection of the column 110 and the multiple concrete beams 120 and welded to the steel bars of the floor slab, and then the gap between the steel plate and the concrete is filled with grouting material to densely strengthen the structural strength of the connecting end of the cantilever steel beam 60, and then the cantilever steel beam 60 is installed on the column head steel plate 10 through the ear plate 50, the rectangular connecting plate and the high-strength bolts. Not only is the structure stable, the construction process is simple, and no chemical adhesives are needed to avoid the risk of anchor failure under long-term load conditions; secondly, it is necessary to plant steel bars or chemical anchors on the beams and columns to avoid dense steel bars in the beam-column node area, which affects the construction; finally, the process is standardized, the construction process is less affected by human factors, and the construction quality is effectively guaranteed.

[0045] In specific implementation, the column head surrounding steel plate 10 is welded with multiple steel plates, which can facilitate the column head surrounding steel plate 10 and reduce the difficulty of construction; the specific number of steel plates used is based on the size of the floor gap and the need to avoid the column 110. A plurality of beam holes are opened on the side wall of the column head surrounding steel plate 10, and the beam holes are reserved in advance when welding the column head surrounding steel plate 10. The size of the beam holes matches the size of the concrete beam 120, so that the plurality of concrete beams 120 pass through the plurality of beam holes accordingly.

[0046] Furthermore, the upper ring plate 20 and the lower ring plate 30 both include an annular connecting plate 90 and a plurality of extension plates 100. The annular connecting plate 90 is a square annular plate structure. The inner hole size of the annular connecting plate 90 matches the side length of the column head sleeve steel plate 10 so as to be sleeved and welded on the column head sleeve steel plate 10. One end of the plurality of extension plates 100 is welded to the annular connecting plate 90, and the other end of the plurality of extension plates 100 extends in the direction of the concrete beam 120 and abuts against the concrete beam 120. The upper end of each pair of beam head side wall steel plates 40 is correspondingly welded to both sides of the extension plate 100 of the upper ring plate 20, and the lower end of each pair of beam head side wall steel plates 40 is correspondingly welded to both sides of the extension plate 100 of the lower ring plate 30. Thus, the concrete beam 120 is enclosed and fastened, and the structural stability of the entire cantilever beam is enhanced. In actual processing, the upper ring plate 20 and the lower ring plate 30 can be made of two symmetrical parts that are spliced ​​and enclosed from both sides of the column head surrounding steel plate 10, thereby reducing the difficulty of welding and processing.

[0047] The cantilever beam construction and installation method and the novel cantilever beam structure of the present invention have the following beneficial effects:

[0048] 1) The present invention avoids the potential risk of adhesive instability of the cantilever beam under long-term load.

[0049] 2) The present invention is not affected by the construction process of planting steel bars or chemical anchor bolts; it avoids the problem of dense steel bars and difficulty in forming holes in the beam-column joint area that exists in the conventional practice.

[0050] 3) The cantilever beam of the present invention has a clear and direct force transmission path, and the construction operation is simple, safe and reliable.

[0051] 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 cantilever beam construction and installation method, characterized in that: The following steps are involved: Chiseling away the floor slabs on the sides of the column (110) corresponding to the position where the cantilever beam structure is to be added and on both sides of the concrete beam (120) to expose the concrete beam (120); Welding a column head steel plate (10) at the intersection of the column (110) and the concrete beam (120); An upper ring plate (20) and a lower ring plate (30) are welded and installed on the column head surrounding steel plate (10), and the lower surface of the upper ring plate (20) is ensured to abut against the upper surface of the concrete beam (120), and the upper surface of the lower ring plate (30) is ensured to abut against the lower surface of the concrete beam (120); Welding a plurality of pairs of beam head side wall steel plates (40) between the upper ring plate (20) and the lower ring plate (30), and ensuring that each pair of beam head side wall steel plates (40) is located on both sides of the concrete beam (120); Welding an ear plate (50) to the outer side wall of the column head surrounding steel plate (10), and ensuring that the upper end and the lower end of the ear plate (50) are correspondingly welded to the upper ring plate (20) and the lower ring plate (30); Filling the gaps between the column head steel plate (10), the upper ring plate (20), the lower ring plate (30), the beam head side wall steel plate (40) and the concrete at the node area between the column (110) and the concrete beam (120) with grouting material; The cantilever steel beam (60) is fixedly mounted on the ear plate (50) by means of a rectangular connecting plate (70) and high-strength bolts (80) and ensures that the cantilever steel beam (60) extends outward in a direction away from the column head surrounding steel plate (10); The chiseled out floor slab reinforcement is welded to the steel plate and the chiseled out part of the floor slab is repaired with grouting material.

2. The construction and installation method according to claim 1, characterized in that: When chiseling away the floor slabs on the sides of the column (110) and the concrete beam (120), the floor slab reinforcement is retained and the concrete outer surface of the node area between the column (110) and the concrete beam (120) is roughened.

3. The construction and installation method according to claim 1, characterized in that: When welding the column head surrounding steel plate (10), multiple steel plates are welded, and beam holes are reserved on the side walls of the column head surrounding steel plate (10) so that the concrete beam (120) can pass through the beam holes.

4. The construction and installation method according to claim 1, characterized in that: When the upper ring plate (20) and the lower ring plate (30) are welded and installed on the column head surrounding steel plate (10), the upper ring plate (20) and the lower ring plate (30) are formed by splicing a plurality of steel plates.

5. The construction and installation method according to claim 1, characterized in that: When welding a plurality of pairs of beam head side wall steel plates (40) between the upper ring plate (20) and the lower ring plate (30), the upper ends of each pair of beam head side wall steel plates (40) are correspondingly welded to the two sides of the extension plate (100) of the upper ring plate (20), and the lower ends of each pair of beam head side wall steel plates (40) are correspondingly welded to the two sides of the extension plate (100) of the lower ring plate (30).

6. A new cantilever beam structure, characterized in that: The cantilever beam structure is constructed by the construction and installation method described in any one of claims 1 to 5, and the cantilever beam structure comprises: The column head is surrounded by a steel plate (10), which is fixedly mounted at the intersection of the column body (110) and the plurality of concrete beams (120); An upper ring plate (20) is sleeved and welded on the column head surrounding steel plate (10), and the lower surface of the upper ring plate (20) abuts against the upper surface of the concrete beam (120); A lower ring plate (30) is sleeved and welded on the column head surrounding steel plate (10), and the upper surface of the lower ring plate (30) abuts against the lower surface of the concrete beam (120); Beam head side wall steel plates (40), the beam head side wall steel plates (40) are multiple pairs, each pair of the beam head side wall steel plates (40) is arranged on two sides of a concrete beam (120) opposite to each other, and the upper end and the lower end of the beam head side wall steel plates (40) are correspondingly welded to the upper ring plate (20) and the lower ring plate (30); An ear plate (50) is welded to the outer wall of the column head surrounding steel plate (10), the upper end and the lower end of the ear plate (50) are correspondingly welded to the upper ring plate (20) and the lower ring plate (30), and the ear plate (50) is provided with mounting screw holes; A cantilever steel beam (60), the end of which is fixed to the bolt hole of the ear plate (50) through a rectangular connecting plate (70) and a high-strength bolt (80) and extends outward in a direction away from the column head sleeve steel plate (10).

7. The novel cantilever beam structure according to claim 6 is characterized in that: A plurality of beam holes are provided on the side wall of the column head surrounding steel plate (10), and a plurality of concrete beams (120) pass through the plurality of beam holes accordingly.

8. The novel cantilever beam structure according to claim 6 is characterized in that: The upper ring plate (20) and the lower ring plate (30) both include an annular connecting plate (90) and a plurality of extension plates (100); the annular connecting plate (90) is sleeved on and welded to the column head surrounding steel plate (10); one end of the plurality of extension plates (100) is welded to the annular connecting plate (90); the other ends of the plurality of extension plates (100) extend in the direction of the concrete beam (120) and abut against the concrete beam (120).

9. The novel cantilever beam structure according to claim 8 is characterized in that: The upper ends of each pair of beam head side wall steel plates (40) are correspondingly welded to the two sides of the extension plate (100) of the upper ring plate (20), and the lower ends of each pair of beam head side wall steel plates (40) are correspondingly welded to the two sides of the extension plate (100) of the lower ring plate (30).

10. The novel cantilever beam structure according to claim 6 is characterized in that: The column head surrounding steel plate (10), the upper ring plate (20) and the lower ring plate (30) are all formed by splicing a plurality of steel plates.

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