An adjustable cantilever steel beam installation structure for building engineering external frame and construction method

Abstract

The invention discloses an adjustable construction engineering external frame cantilever steel beam installation structure and a construction method, and relates to the technical field of construction construction external frame installation; the installation structure comprises a steel tie rod and a basket bolt, the steel tie rod is hinged to a connecting steel plate through a shaped steel plate, and the steel tie rod is fixedly connected to a main structure through a shaped bent plate, and the basket bolt is connected to the steel tie rod so that the steel tie rod is divided into two sections and the divided part is connected through two ends of the basket bolt so that the length of the steel tie rod can be adjusted; the construction method comprises structural member production - external frame cantilever steel beam installation - steel tie rod installation - basket bolt installation - rotating basket bolt to adjust the cantilever steel beam angle, and through the implementation of the technical scheme, the technical problems of complex installation structure and difficult construction of the external frame cantilever steel beam of conventional construction engineering cantilever ...

Description

Technical Field

[0001] The invention relates to the technical field of building construction external frame installation, and more specifically, to an adjustable building engineering external frame cantilever steel beam installation structure and a construction method. Background Art

[0002] The external frame of a construction project includes a scaffolding whose frame structure unloads on a rigid cantilever beam (frame) attached to the building structure. It is used for the main construction or decoration project operations and their safety protection needs. The supporting structure of the external frame should be a cantilever steel beam or cantilever truss made of steel sections. Among them, the frame members whose height exceeds the design height will reduce the bending resistance and overall stability of the cantilever beam due to the long cantilever length. Therefore, reliable reinforcement measures must be taken here.

[0003] Existing cantilever steel beam support methods mostly adopt the method of pulling up the end of the cantilever steel beam by wire rope or unloading the bottom steel member diagonal brace. This support method requires a large workload for disassembly and assembly of the support frame, and requires a support platform directly below the cantilever steel beam. It needs to be anchored inside the building with a fixed length of 1.25 times the cantilever length. However, the lower diagonal brace is used for unloading, and the overall component of the material needs to be prefabricated in advance, and then the lower diagonal brace is hoisted to the construction site for reinforcement. The material production cost is high, and the operation risk is high. The operation is complicated and the construction is difficult. In view of the technical bottleneck faced by the method of unloading the lower diagonal brace, technical personnel in this field are urgently needed to study and design an adjustable construction project external frame cantilever steel beam installation structure / construction method to simplify the construction structure and improve construction efficiency according to the appearance characteristics of the building structure and the construction progress. Summary of the invention

[0004] In order to solve the technical problems of the complex installation structure and difficult construction of the cantilevered steel beams of the conventional external frame of construction projects, the purpose of the present invention is to provide an adjustable installation structure for the cantilevered steel beams of the external frame of construction projects, which aims to reserve installation holes for the installation points of the cantilevered steel beams of the external frame in the main structure before the cantilevered external frame is installed, and fix the cantilevered steel beams of the external frame in place with adjustable pull rods and fixing bolts. The structure is simple in design, can achieve precise positioning of the cantilevered steel beams of the external frame, and the fixed installation is stable and reliable, and the cantilevered steel beams of the external frame can be installed safely, conveniently and efficiently, and has a good application prospect.

[0005] The technical solution adopted by the present invention is as follows:

[0006] An adjustable cantilever steel beam installation structure for an external frame of a building engineering, comprising a steel tie rod and a turnbuckle bolt;

[0007] The steel tie rod is obliquely arranged between the cantilever steel beam and the upper main structure, the lower end of the steel tie rod is connected to the end of the cantilever steel beam, and the upper end of the steel tie rod is connected to the upper main structure to form a triangular hanging state;

[0008] A shaped steel plate is provided at one end of the steel tie rod connected to the cantilever steel beam, and a connecting steel plate perpendicular to the end of the cantilever steel beam is provided, and the steel tie rod is hinged to the connecting steel plate through the shaped steel plate; a shaped bent plate is provided at one end of the steel tie rod connected to the main structure, and the shaped bent plate is bent and extended from the end of the steel tie rod to the main structure, so that the steel tie rod is fixedly connected to the main structure through the shaped bent plate;

[0009] The turnbuckle bolt is connected to the steel tie rod to divide the steel tie rod into two sections and the divisions of the two sections of the steel tie rod are respectively connected to the two ends of the turnbuckle bolt so that the length of the steel tie rod can be adjusted.

[0010] In the technical solution, a connecting bolt hole is provided at one end of the shaped steel plate, and a corresponding embedded bolt hole is provided on the upper main structure, so that the shaped steel plate is hinged to the connecting steel plate through the connecting bolts; a first U-shaped groove is provided at the other end of the shaped steel plate, so that the lower end of the steel tie rod is embedded in the first U-shaped groove and welded and fixed to the shaped steel plate, so as to ensure the connection stability between the steel tie rod and the cantilever steel beam.

[0011] As a preferred solution, the first U-shaped groove is centrally located on the end surface of the shaped steel plate to ensure reliable connection between the steel pull rod and the shaped steel plate.

[0012] As a preferred solution, the bending angle of the fixed curved plate is 45° to 60°. The design of the fixed curved plate with this angle can ensure the connection stability between the steel tie rod and the main structure through the fixed curved plate, and the steel tie rod adopts a rigid fixed structure, which can effectively ensure the installation stability of the cantilever steel beam of the external frame and ensure construction safety.

[0013] As a preferred solution, one end of the formed bent plate extending to the upper main structure is provided with a bolt hole and is fixedly connected to the main structure by fixing bolts, and the other end of the formed bent plate is provided with a second U-shaped groove so that the upper end of the steel tie rod can be embedded in the second U-shaped groove and welded to the formed bent plate to ensure the connection stability between the steel tie rod and the main structure.

[0014] As a preferred solution, the second U-shaped groove is centrally located on the end surface of the formed bent plate to ensure a reliable connection between the steel pull rod and the formed bent plate.

[0015] As a preferred solution, the turnbuckle bolt includes two cylindrical nuts and a connecting round steel for connecting the two cylindrical nuts, so that the two sections of the steel tie rod are respectively threadedly connected to the two cylindrical nuts. With the above structure, the length of the steel tie rod can be adjusted by rotating the turnbuckle bolt, thereby adjusting the angle of the external frame cantilever steel beam. Combined with the structural design of the steel tie rod and the shaped steel plates and shaped bent plates at both ends, the stability and reliability of the external frame cantilever steel beam installation structure can be effectively improved.

[0016] As a preferred solution, three connecting round steels are respectively arranged at equal angles along the axial direction on the outer side walls of the two columnar nuts, so that the two ends of the three connecting round steels are respectively welded and fixed to the two columnar nuts to ensure the structural stability of the basket bolt. The production is simple and the materials are easy to obtain, so that the steel pull rod is easy to install, the reuse rate is high, and the amount of turnover materials used is reduced.

[0017] As a preferred solution, it also includes a support steel plate and a connecting screw welded around the end of the cantilever steel beam. The support steel plate is provided with bolt holes on both sides of the cantilever steel beam, and a pre-buried bolt hole is provided on the main structure, so that the cantilever steel beam can be fixed to the main structure by passing the connecting screw through the support steel plate and the pre-buried bolt holes on the main structure. In this way, before the cantilever external frame is installed, the installation point of the cantilever steel beam of the external frame is reserved in the main structure to ensure the installation and positioning accuracy of the cantilever steel beam of the external frame, improve the process interlacing, and reduce the coordination time.

[0018] On the other hand, the present invention also provides a construction method for an adjustable construction engineering external frame cantilever steel beam installation structure, the construction method comprising the following steps:

[0019] S1, manufacturing the steel tie rod, the basket bolt, and the shaped steel plates and shaped bent plates provided at both ends of the steel tie rod according to the design dimensions of the cantilever steel beam;

[0020] S2, making a cantilever steel beam for a fixed external frame: cutting a set I-beam, welding a connecting steel plate to the upper part of the flange plate at one end of the I-beam, milling a bolt hole in the middle of the connecting steel plate, welding a support steel plate around the other end of the I-beam, milling bolt holes on both sides of the web of the I-beam on the support steel plate, and making a cantilever steel beam for a fixed external frame;

[0021] S3, before the construction of the cast-in-place concrete shear wall or structural beam of the main structure, pre-embed bolt holes on the main structure, and after the concrete pouring is completed, use two connecting screws to fix the cantilever steel beam of the fixed external frame prepared in step S2 through the pre-embedded bolt holes of the main structure to the surrounding external walls of the building;

[0022] S4. After the construction of the cast-in-place concrete shear wall or structural beam of the upper main structure is completed, the fixed steel plate on the steel tie rod is connected to the connecting steel plate on the cantilever steel beam by connecting bolts, and the fixed bent plate on the steel tie rod is connected to the embedded bolt hole of the upper main structure by fixing bolts, and then the two sections of the steel tie rod are connected at the division by basket bolts, and finally the basket bolts are rotated to adjust the external frame cantilever steel beam to the appropriate angle, thus completing the installation of the external frame cantilever steel beam.

[0023] As described above, the present invention has at least the following beneficial effects compared with the prior art:

[0024] 1. The installation structure of the present invention is designed according to the installation characteristics of the building structure and the external frame cantilever steel beam. The external frame cantilever steel beam installation structure can be manufactured in advance, and modular, standardized and factory-made production can be carried out to improve construction efficiency. The structure is simple in design, and can achieve precise positioning of the external frame cantilever steel beam, and the fixed installation is stable and reliable, so the external frame cantilever steel beam can be installed safely, conveniently and efficiently.

[0025] 2. The installation structure of the present invention adopts steel tie rods to bear the load of the cantilevered steel beams of the external frame, and adopts the shaped steel plates at the ends of the steel tie rods to be hinged with the connecting steel plates on the cantilevered steel beams, and adopts shaped bent plates to connect with the upper main structure, so that the steel tie rods bear the force evenly and have high-strength load-bearing capacity, thereby ensuring stable and reliable installation of the cantilevered steel beams of the external frame and ensuring construction safety.

[0026] 3. The installation structure of the present invention adopts specially made basket bolts to be connected to the steel pull rod. Combined with the structural design characteristics of the steel pull rod, the rotating basket can be used to conveniently adjust the length of the steel pull rod, and then adjust the angle of the cantilevered steel beam of the external frame. The structural design is simple but ingenious and reasonable, the basket bolt structure has good stability, and the installation operation is convenient.

[0027] 4. The cantilever steel beams of the external frame of the present invention are lighter than traditional cantilever steel beams, and are flexible and convenient to install and disassemble. They have a high reuse rate, reduce the amount of circulating materials, and can reduce labor costs and material costs, thus saving a lot of construction costs overall.

[0028] 5. The construction process of the present invention can embed bolt holes before wall construction, improve the efficiency of inserting cantilevered steel beams of the external frame, reduce coordination time, shorten the construction period, and further reduce construction costs.

[0029] To sum up, the construction method of the cantilever steel beam installation structure of the present invention is simple to operate, has high construction efficiency, reduces the use of auxiliary materials, saves labor, shortens the construction period, improves construction quality, and produces great economic benefits. At the same time, it also has great social benefits and high promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be described by way of specific embodiments and with reference to the accompanying drawings, in which

[0031] Figure 1 It is a schematic diagram of the installation of an adjustable cantilevered steel beam installation structure for an external frame of a building project according to an exemplary embodiment of the present invention;

[0032] Figure 2 An exemplary embodiment of the present invention Figure 1 Schematic diagram of the connection between the middle shaped steel plate and the steel tie rod;

[0033] Figure 3 An exemplary embodiment of the present invention Figure 1Schematic diagram of the connection between the middle-shaped bent plate and the steel tie rod;

[0034] Figure 4 An exemplary embodiment of the present invention Figure 1 Schematic diagram of the center turnbuckle bolt;

[0035] Figure 5 An exemplary embodiment of the present invention Figure 1 Schematic diagram of the mid-cantilever steel beam;

[0036] Figure 6 An exemplary embodiment of the present invention Figure 1 Schematic diagram of the installation of the mid-cantilever steel beam.

[0037] Explanation of the reference numerals: 1-main structure; 2-cantilever steel beam; 21-connecting steel plate; 22-support steel plate; 23-connecting bolt; 3-steel tie rod; 4-basket bolt; 41-columnar nut; 42-connecting round steel; 5-shaped steel plate; 51-first U-shaped groove; 6-shaped bent plate; 61-second U-shaped groove; 7-connecting screw; 8-embedded bolt hole; 9-fixing bolt. DETAILED DESCRIPTION

[0038] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0039] Any feature disclosed in this specification (including any additional claims and abstract), unless otherwise stated, may be replaced by other equivalent or alternative features having similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0040] The embodiment is basically as follows Figure 1 As shown: This embodiment provides an adjustable cantilever steel beam installation structure for an external frame of a building project, including a steel tie rod 3 and a basket bolt 4; the steel tie rod 3 is obliquely arranged between the cantilever steel beam 2 and the upper main structure 1, the lower end of the steel tie rod 3 is connected to the end of the cantilever steel beam 2, and the upper end of the steel tie rod 3 is connected to the upper main structure 1 to form a triangular suspended state; specifically, a shaping steel plate 5 is provided at one end of the steel tie rod 3 connected to the cantilever steel beam 2, and a connecting steel plate 21 perpendicular to its end is provided on the cantilever steel beam 2, and the steel tie rod 3 is hinged to the connecting steel plate 21 through the shaping steel plate 5; a shaping bent plate 6 is provided at one end of the steel tie rod 3 connected to the main structure 1, and the shaping bent plate 6 is bent and extended from the end of the steel tie rod 3 to the main structure 1, so that the steel tie rod 3 is fixedly connected to the main structure 1 through the shaping bent plate 6.

[0041] like Figure 2As shown, one end of the shaped steel plate 5 is provided with a connecting bolt 23 hole and is hinged to the connecting steel plate 21 through the connecting bolt 23, and the other end of the shaped steel plate 5 is provided with a first U-shaped groove 51, so that the lower end of the steel tie rod 3 is embedded in the first U-shaped groove 51 and welded and fixed to the shaped steel plate 5, so as to ensure the connection stability between the steel tie rod 3 and the cantilever steel beam 2; preferably, the first U-shaped groove 51 is located in the center of the end face of the shaped steel plate 5, so as to ensure a reliable connection between the steel tie rod 3 and the shaped steel plate 5.

[0042] As a preferred embodiment of this invention, Figure 1 and Figure 3 As shown, the bending angle of the formed bent plate 6 is 45° to 60°. This embodiment takes the bending angle of the formed bent plate 6 being 50° as an example. The design of the formed bent plate 6 at this angle can ensure the connection stability between the steel tie rod 3 and the main structure 1 through the formed bent plate 6, and the steel tie rod 3 adopts a rigid formed structure, which can effectively ensure the installation stability of the external frame cantilever steel beam 2 and ensure construction safety.

[0043] Furthermore, a bolt hole is provided at one end of the forming bent plate 6 extending toward the upper main structure 1, and a corresponding embedded bolt hole 8 is provided on the upper main structure 1, so that the forming bent plate 6 is fixedly connected to the main structure 1 by fixing bolts 9; a second U-shaped groove 61 is provided at the other end of the forming bent plate 6, so that the upper end of the steel tie rod 3 is embedded in the second U-shaped groove 61 and welded and fixed to the forming bent plate 6, so as to ensure the connection stability between the steel tie rod 3 and the main structure 1; preferably, the second U-shaped groove 61 is centrally located on the end face of the forming bent plate 6, so as to ensure a reliable connection between the steel tie rod 3 and the forming bent plate 6.

[0044] The turnbuckle bolt 4 provided in this embodiment is connected to the steel tie rod 3, so that the steel tie rod 3 is divided into two sections and the divisions of the two sections of the steel tie rod are respectively connected to the two ends of the turnbuckle bolt 4, so that the length of the steel tie rod 3 can be adjusted; specifically, Figure 4 As shown, the basket bolt 4 includes two columnar nuts 41 and a connecting round steel 42 for connecting the two columnar nuts 41, so that the two sections of the steel tie rod 3 are respectively threadedly connected to the two columnar nuts 41. With the above structure, the length of the steel tie rod 3 can be adjusted by rotating the basket bolt 4, and then the angle of the external frame cantilever steel beam 2 can be adjusted. Combined with the structural design of the steel tie rod 3 and the shaped steel plates 5 and the shaped bent plates 6 at both ends, the stability and reliability of the installation structure of the external frame cantilever steel beam 2 can be effectively improved; preferably, three connecting round steels 42 are respectively arranged at equal angles along the axial direction on the outer side walls of the two columnar nuts 41, so that the two ends of the three connecting round steels 42 are respectively welded and fixed to the two columnar nuts 41 to ensure the structural stability of the basket bolt 4, and the production is simple and the materials are easy to obtain, so that the steel tie rod 3 is easy to install, the reuse rate is high, and the amount of turnover materials is reduced.

[0045] Combination Figure 5 and Figure 6 As shown, the installation structure of the external frame cantilever steel beam 2 provided in this embodiment includes a support steel plate 22 and a connecting screw 7 welded around the end of the cantilever steel beam 2, the support steel plate 22 is provided with bolt holes on both sides of the cantilever steel beam 2, and a pre-embedded bolt hole 8 is provided on the main structure 1, so that the cantilever steel beam 2 can be fixed on the main structure 1 by passing the connecting screw 7 through the support steel plate 22 and the pre-embedded bolt hole 8 on the main structure 1; in this way, before the cantilever external frame is installed, the installation hole position of the installation point of the external frame cantilever steel beam 2 is reserved in the main structure 1 to ensure the installation positioning accuracy of the external frame cantilever steel beam 2, improve the process interlacing, and reduce the coordination time.

[0046] on the other hand, Figure 1 The schematic diagram of the installation of the adjustable cantilever steel beam 2 installation structure of the building engineering external frame according to the exemplary embodiment of the present invention is shown. According to the embodiment of the present invention, the embodiment also provides a method for erecting a high-altitude large-span cantilever formwork frame operating platform, comprising the following steps:

[0047] S1, according to the design size of the cantilever steel beam 2, the steel tie rod 3, the basket bolt 4, and the shaped steel plate 5 and the shaped bent plate 6 arranged at both ends of the steel tie rod 3 are manufactured; the specific manufacturing method is as follows:

[0048] Step 1: Cut two sections of high-strength round steel as steel tie rods 3, and cut a section of steel plate as a shaped steel plate 5, mill a bolt hole at one end of the shaped steel plate 5, and cut a first U-shaped groove 51 at the center of the other end of the shaped steel plate 5, weld the steel tie rod 3 in the center of the first U-shaped groove 51 of the shaped steel plate 5, and thread the other end of the steel tie rod 3;

[0049] Step 2: Cut a section of steel plate as a shaping bent plate 6, bend one end of the shaping bent plate 6 at a bending angle of 50°, cut a second U-shaped groove 61 at the center of the other end of the shaping bent plate 6, weld another section of steel tie rod 3 in the center of the second U-shaped groove 61 of the shaping bent plate 6, and thread the other end of the steel tie rod 3;

[0050] Step 3: Select two thick-walled high-strength long cylindrical nuts 41 and three connecting round steel bars 42, draw three straight lines at an axial interval of 120° on the outer wall of the two long cylindrical nuts 41 for welding the connecting round steel bars 42, and weld the two high-strength long cylindrical nuts 41 with the three high-strength connecting round steel bars 42 to form a fixed basket bolt 4, which is used to adjust the length of the two sections of steel tie rods 3 in the later stage;

[0051] S2, making a cantilever steel beam 2 for a fixed external frame: cutting a set I-beam, welding a connecting steel plate 21 to the upper part of the flange plate at one end of the I-beam, milling a bolt hole in the middle of the connecting steel plate 21, welding a support steel plate 22 around the other end of the I-beam, milling bolt holes on both sides of the web of the I-beam on the support steel plate 22, and making a fixed external frame cantilever steel beam 2;

[0052] S3, before the construction of the cast-in-place concrete shear wall or structural beam of the main structure 1, pre-embed bolt holes 8 on the main structure 1, and after the concrete pouring is completed, use two connecting screws 7 to fix the cantilever steel beam 2 of the fixed external frame made in step S2 through the pre-embedded bolt holes 8 of the main structure 1 to the surrounding external walls of the building;

[0053] S4, after the construction of the cast-in-place concrete shear wall or structural beam of the upper main structure 1 is completed, the fixed steel plate 5 on the steel tie rod 3 is connected to the connecting steel plate 21 on the cantilever steel beam 2 by using the connecting bolts 23, and the fixed bent plate 6 on the steel tie rod 3 is connected to the embedded bolt hole 8 of the upper main structure 1 by using the fixing bolts 9, and then the two sections of the steel tie rod 3 are connected at the division by the basket bolts 4, and finally the basket bolts 4 are rotated to adjust the external frame cantilever steel beam 2 to the appropriate angle, and the installation of the external frame cantilever steel beam 2 is completed.

[0054] To sum up, the installation structure of the external frame cantilever steel beam 2 of the present invention is designed according to the installation characteristics of the building structure and the external frame cantilever steel beam 2. Before the cantilever external frame is installed, the installation point of the external frame cantilever steel beam 2 is reserved in the main structure 1, and the external frame cantilever steel beam 2 is fixed in position with an adjustable pull rod and a fixing bolt 9. The structure is simple in design, can achieve precise positioning of the external frame cantilever steel beam 2, and the fixed installation is stable and reliable, and the external frame cantilever steel beam 2 can be installed safely, conveniently and efficiently; and the construction efficiency is high, the use of auxiliary materials is reduced, labor is saved, the construction period is shortened, and the construction quality is improved, which produces great economic benefits. At the same time, it also has great social benefits and high promotion and application value, and is suitable for promotion and application.

[0055] The above basic examples of the present invention and their further optional examples can be freely combined to form multiple embodiments, all of which are embodiments that can be adopted and claimed for protection by the present invention. In the scheme of the present invention, each optional example can be arbitrarily combined with any other basic examples and optional examples.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An adjustable cantilever steel beam installation structure for an external frame of a building project, characterized in that: Includes steel tie rods and turnbuckles; The steel tie rod is obliquely arranged between the cantilever steel beam and the upper main structure, the lower end of the steel tie rod is connected to the end of the cantilever steel beam, and the upper end of the steel tie rod is connected to the upper main structure to form a triangular hanging state; A shaped steel plate is provided at one end of the steel tie rod connected to the cantilever steel beam, and a connecting steel plate perpendicular to the end of the cantilever steel beam is provided, and the steel tie rod is hinged to the connecting steel plate through the shaped steel plate; a shaped bent plate is provided at one end of the steel tie rod connected to the main structure, and the shaped bent plate is bent and extended from the end of the steel tie rod to the main structure, so that the steel tie rod is fixedly connected to the main structure through the shaped bent plate; The turnbuckle bolt is connected to the steel tie rod to divide the steel tie rod into two sections and the divisions of the two sections of the steel tie rod are respectively connected to the two ends of the turnbuckle bolt so that the length of the steel tie rod can be adjusted; A connecting bolt hole is provided at one end of the shaped steel plate, and a corresponding embedded bolt hole is provided on the upper main structure, so that the shaped steel plate is hinged with the connecting steel plate through the connecting bolt; a first U-shaped groove is provided at the other end of the shaped steel plate, so that the lower end of the steel tie rod is embedded in the first U-shaped groove and is welded and fixed to the shaped steel plate; The first U-shaped groove is arranged in the center of the end surface of the shaped steel plate; The bending angle of the shaped curved plate is 45° to 60°; One end of the shaped bent plate extending to the upper main structure is provided with a bolt hole and is fixedly connected to the main structure through fixing bolts, and the other end of the shaped bent plate is provided with a second U-shaped groove, so that the upper end of the steel tie rod is embedded in the second U-shaped groove and is welded and fixed to the shaped bent plate; The second U-shaped groove is centrally disposed on the end surface of the shaping bent plate; The turnbuckle bolt comprises two cylindrical nuts and a connecting round steel for connecting the two cylindrical nuts, so that the two sections of the steel tie rod are respectively threadedly connected with the two cylindrical nuts; Three connecting round steel bars are respectively arranged at equal angles along the axial direction on the outer side walls of the two columnar nuts, so that the two ends of the three connecting round steel bars are respectively welded and fixed to the two columnar nuts; It also includes a support steel plate and a connecting screw welded around the end of the cantilever steel beam. The support steel plate is provided with bolt holes on both sides of the cantilever steel beam, and embedded bolt holes are provided on the main structure, so that the cantilever steel beam can be fixed to the main structure by passing the connecting screw through the support steel plate and the embedded bolt holes on the main structure.

2. A construction method using the adjustable building engineering external frame cantilever steel beam installation structure as claimed in claim 1, characterized in that: The construction method The following steps are involved: S1, manufacturing the steel tie rod, the basket bolt, and the shaped steel plates and shaped bent plates provided at both ends of the steel tie rod according to the design dimensions of the cantilever steel beam; S2, making a cantilever steel beam for a fixed external frame: cutting a set I-beam, welding a connecting steel plate to the upper part of the flange plate at one end of the I-beam, milling a bolt hole in the middle of the connecting steel plate, welding a support steel plate around the other end of the I-beam, milling bolt holes on both sides of the web of the I-beam on the support steel plate, and making a cantilever steel beam for a fixed external frame; S3, before the construction of the cast-in-place concrete shear wall or structural beam of the main structure, pre-embed bolt holes on the main structure, and after the concrete pouring is completed, use two connecting screws to fix the cantilever steel beam of the fixed external frame prepared in step S2 through the pre-embedded bolt holes of the main structure to the surrounding external walls of the building; S4. After the construction of the cast-in-place concrete shear wall or structural beam of the upper main structure is completed, the fixed steel plate on the steel tie rod is connected to the connecting steel plate on the cantilever steel beam by connecting bolts, and the fixed bent plate on the steel tie rod is connected to the embedded bolt hole of the upper main structure by fixing bolts, and then the steel tie rod is connected at the split point by using basket bolts, and finally the basket bolts are rotated to adjust the external frame cantilever steel beam to the appropriate angle, thus completing the installation of the external frame cantilever steel beam.

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