Structural transition layer type steel seismic unit and installation method

Abstract

This application relates to the field of civil engineering technology, and in particular to a steel seismic unit for a structural transfer layer, comprising embedded parts, a vertical structure, and steel beams. The embedded parts include eight vertically arranged anchor bolts and a double-layer positioning plate. One end of each anchor bolt is hook-shaped, and the eight anchor bolts are fixedly connected to the same double-layer positioning plate. The vertical structure includes a base plate, a short column web plate welded into a cross shape from steel plates, and flange plates arranged around the web plate. The base plate is fixedly located at the end of the anchor bolts away from the hook-shaped end. The short column web plate is vertically arranged on the surface of the base plate, and the surface of the flange plate is perpendicular to the web plate. The steel beams are connected to the side of the flange plates away from the web plate. A connecting structure is provided at the connection between the flange plates and the steel beams, which achieves the effect of improving the installation accuracy and speed of the seismic unit at the beam-column joint of the transfer layer between the concrete structure and the rigid concrete structure.

Description

Technical Field

[0001] This application relates to the field of civil engineering technology, and in particular to a steel seismic unit for structural transfer layers and its installation method. Background Technology

[0002] In modern building construction, reinforced concrete structures are increasingly used, and the combination of concrete and reinforced concrete structures is also becoming more common. These projects often involve transfer layers between the two structures, particularly at the beam-column joints. Seismic units are typically installed at these transfer layers to connect the different structures. During construction, strict control is required on the installation accuracy of the seismic units and the handling of dense reinforcement at the joints to ensure the construction quality and safety of the superstructure.

[0003] The existing technical solutions mentioned above have the following drawbacks: the installation accuracy and speed of the seismic units at the beam-column joints of the existing concrete structure and rigid concrete structure transfer layer are low, which affects the compressive and seismic resistance of the beam-column joints of the transfer layer. Summary of the Invention

[0004] This application provides a steel seismic unit and its installation method at the beam-column joint of the transfer layer between concrete and stiffened concrete structures to improve the installation accuracy and speed of the seismic unit.

[0005] The above-mentioned technical objective of this application is achieved through the following technical solution: On one hand, a steel seismic unit at a structural transfer layer includes embedded parts, a vertical structure, and steel beams. The embedded parts include eight vertically arranged anchor bolts and a double-layer positioning plate. One end of the anchor bolt is hook-shaped, and the eight anchor bolts are fixedly connected to the same double-layer positioning plate. The vertical structure includes a base plate, a short column web plate welded into a cross shape from steel plates, and fenders arranged around the web plate. The base plate is fixedly arranged at the end of the anchor bolts away from the hook-shaped end. The short column web plate is vertically arranged on the surface of the base plate. The surface of the fenders is perpendicular to the web plate. The steel beams are connected to the side of the fenders away from the web plate. A connection structure is provided at the connection between the fenders and the steel beams.

[0006] By adopting the above scheme, seismic units are installed at the beam-column joint of the transfer layer to realize the conversion and connection between the concrete structure and the rigid concrete structure. The seismic units are connected and fixed to the concrete columns through embedded parts, and are firmly installed with the self-weight of the seismic units. The embedded parts are equipped with double-layer positioning plates to ensure accurate positioning of the embedded parts. The steel seismic units can be installed in sections, which is convenient for operators to install, thereby improving the installation accuracy and speed of the seismic units at the beam-column joint of the transfer layer.

[0007] Optionally, a yoke plate is provided between the web and the fender, the yoke plate is parallel to the bottom plate, and a casting hole is provided on the surface of the yoke plate.

[0008] By adopting the above technical solution, the armhole plate is added to enhance the compressive strength of the cross-shaped web, and the connection between the fender and the web is strengthened, resulting in higher support strength of the seismic unit.

[0009] Optionally, the steel beam is a steel beam composed of I-beams, and stiffening plates for reinforcing the steel beam are fixedly connected to it.

[0010] By adopting the above technical solution, the stiffening plate strengthens the compressive and tensile strength of the middle part of the steel beam, further improving the structural strength of the steel beam. At the same time, the steel beam in the form of I-beam stiffening plate is lighter in weight, making it easier for operators to install, thereby improving the installation speed and accuracy of the seismic unit.

[0011] Optionally, the connection structure includes a slider and a clamping structure. A T-shaped slide rail is provided on one side of the fender connecting steel beam, running from top to bottom. The slider is slidably connected in the T-shaped slide rail and fixedly connected to the steel beam. The clamping structure is connected inside the fender.

[0012] By adopting the above technical solution, when connecting the fender and the steel beam, the slider can be slid into the slide rail, and then the snap-fit ​​structure will snap the slider into the slide rail, thereby fixing the fender and the steel beam together. The operation of connecting the fender and the steel beam is relatively simple and convenient for operators to connect the fender and the steel beam.

[0013] Optionally, the fender has a transmission cavity inside. The clamping structure includes a pressure plate, a guide rod, a wheel rod, and a clamping block. The guide rod is vertically installed in the transmission cavity. A slide tube is slidably connected to the outside of the guide rod. A spring is fixedly connected to one end of the slide tube. The end of the spring away from the slide tube is fixedly connected to the fender. A slide groove communicating with the transmission cavity is opened at the lower position of the slide groove. The pressure plate is slidably connected in the slide rail. The pressure plate passes through the slide groove and is fixedly connected to the slide tube. A first rack is fixedly connected above the slide tube. The two ends of the wheel rod are rotatably connected to the upper position of the transmission cavity. A first gear is fixedly connected to the wheel rod. The first gear meshes with the first rack. A second gear is fixedly installed on the wheel rod. A second rack is fixedly connected to one end of the clamping block. The second gear meshes with the second rack. A clamping hole communicating with the slide rail is opened at the upper position of the transmission cavity. The end of the clamping block away from the rack passes through the clamping hole and exits the transmission cavity.

[0014] By adopting the above technical solution, after the slider is slid into the slide rail, the slider presses the pressure plate downward, causing the pressure plate to slide downward in the slide groove, thereby driving the slide tube to slide downward. This causes the first rack above the slide tube to drive the first gear to rotate, which in turn drives the second gear to rotate. As a result, the second rack and the clamping block move into the slide rail, causing the clamping block to clamp the slider in the slide rail, thereby fixing the fender and the steel beam. This connection method makes the operation easier for the operator and further simplifies the installation of the seismic unit.

[0015] Optionally, a ratchet is fixedly connected to one end of the wheel rod, and a pawl is connected inside the transmission cavity. The ratchet and the pawl cooperate, and when the wheel rod rotates in the direction that causes the clamping block to retract into the transmission cavity, the pawl clamps the ratchet.

[0016] By adopting the above technical solution, the ratchet prevents the second gear from rotating in the opposite direction, thereby preventing the clamping block from retracting into the transmission cavity and causing the steel beam to become unstable.

[0017] Optionally, the locking hole is opened at an angle, with the side of the locking hole near the slide rail tilting downwards.

[0018] By adopting the above technical solution, the clamping block extends obliquely downward when it is inserted into the slide rail, and slides downward at the same time as it is inserted into the slide rail, so that the clamping block clamps the slider in the slide rail, thereby making the fender and steel beam more securely fixed.

[0019] Optionally, one end of the fender connecting steel beam is provided with multiple threaded holes, and the slider is provided with multiple threaded holes at the location where the threaded holes are located on the fender.

[0020] By adopting the above technical solution, after the fender and steel beam are fixed by the connecting structure, bolts can be screwed into the threaded holes to further strengthen the fixing of the fender and steel beam.

[0021] On the other hand, this application provides a steel seismic unit for a structural transfer layer, comprising the following steps: S1. After the reinforcement of the lower concrete column is tied and the formwork is erected, before the concrete is poured, the embedded parts are pre-installed according to the preset elevation and position of the seismic unit, and then the embedded parts are welded and fixed to the reinforcement of the lower concrete column. S2. Pour the lower concrete column to the design elevation. After the lower concrete has solidified to the required strength, remove the concrete column formwork. Screw a single nut into the hook-shaped end of each anchor bolt and install a washer. S3. Insert one end of the anchor bolt installation washer into the bottom of the base plate, then install the washer at each connection between the anchor bolt and the base plate and screw in the double bolts to fix the anchor bolt to the base plate. Then weld the double nuts to fix them. S4. The steel beams and fenders are fixed together by the connecting structure. The reinforcing bars are passed through the vertical structure and the steel beams according to the predetermined connection method and fixed to the vertical structure and the steel beams by welding. Then the beam and column formwork is installed.

[0022] S5. Pour concrete into the beam and column formwork, leaving a position above the short column for connection with the upper steel column. After the concrete reaches the required strength, remove the beam and column formwork and install the upper steel column.

[0023] In summary, this application has the following technical effects: By dividing the seismic unit into embedded parts, vertical structures, and steel beams, the installation of the seismic unit becomes more efficient and accurate. By setting up a clamping structure, the slider can be clamped in the slide rail, thereby fixing the fender and the steel beam; The ratchet and pawl mechanism prevents the locking block from retracting into the transmission cavity, which could cause the fender and steel beam to become loosely connected. Attached Figure Description

[0024] Figure 1 This is an overall structural diagram of this application; Figure 2 This is a front view of the overall structure of this application installed within the conversion layer; Figure 3 This is a partial structural cross-sectional view intended to emphasize the structure at the wheel hub in this application; Figure 4 This is a partial structural cross-sectional view intended to emphasize the structure at the pressure plate in this application; Figure 5 This is an exploded view of the connection between the steel beam and the fender in this application.

[0025] In the diagram, 1. Embedded part; 11. Double-layer positioning plate; 12. Anchor bolt; 2. Vertical structure; 21. Base plate; 22. Web plate; 221. Haunch plate; 222. Casting hole; 23. Fender; 231. Slide rail; 232. Transmission cavity; 233. Slide groove; 234. Clamping hole; 3. Steel beam; 31. Stiffening plate; 4. Sliding block; 5. Clamping structure; 51. Pressure plate; 52. Guide rod; 521. Slide tube; 522. Spring; 523. First rack; 53. Wheel rod; 531. First gear; 532. Second gear; 54. Clamping block; 541. Second rack; 6. Ratchet; 61. Pawl; 7. Lower concrete column; 8. Concrete beam; 9. Upper steel column. Detailed Implementation

[0026] The present application will be further described in detail below with reference to the accompanying drawings.

[0027] Reference Figure 1 and Figure 2A steel seismic unit for a structural transfer layer includes embedded parts 1, a vertical structure 2, and steel beams 3. The vertical structure 2 is installed above the embedded parts 1. Four steel beams 3 are arranged around the vertical structure 2, and connecting structures are provided between the steel beams 3 and the vertical structure 2. During installation, the embedded parts 1 are first embedded according to the design elevation and position of the seismic unit. Then, concrete is poured into the lower concrete columns 7. After the concrete hardens, the vertical structure 2 is installed above the embedded parts 1 and fixed. Then, the vertical structure 2 is fixedly connected to the steel beams 3 around its perimeter using connecting structures. Concrete is then poured into the concrete beams 8 for fixation. After the concrete reaches the required strength and the formwork is removed, the upper steel columns 9 are installed. This method allows operators to perform step-by-step installation, making the installation of the seismic unit more convenient and improving the installation accuracy and speed.

[0028] Reference Figure 1 and Figure 2 The embedded part 1 includes a double-layer positioning plate 11 and eight anchor bolts 12. These eight anchor bolts pass through the double-layer positioning plate 11 and are welded to it. The double-layer positioning plate 11 is made of thin steel plate, which provides sufficient support and compressive strength while being lighter than thick steel plates. At the same end of each of the eight anchor bolts 12, a hook shape is formed with a bending angle of 90 degrees, and the bending direction is outward from the double-layer positioning plate 11. The hook shape of the anchor bolts 12 allows them to be placed stably above the lower concrete column 7, facilitating the placement of the embedded part 1 in the predetermined position. During installation, the embedded part 1 is first placed in the predetermined position, then the double-layer positioning plate 11 is welded to the reinforcing steel of the lower concrete column 7, and finally concrete is poured into the lower concrete column 7. This fixing method ensures accurate positioning of the embedded part 1, simplifies the operation, and provides high fixing strength.

[0029] Reference Figure 1 and Figure 2The vertical structure 2 includes a base plate 21, a web plate 22, and a fender 23. The base plate 21 is a rectangular steel plate with eight circular holes on its surface. The positions of the circular holes are the same as those of the anchor bolts 12. The anchor bolts 12 have threads on their circumferential surfaces away from the hook-shaped end. The anchor bolts 12 pass through the circular holes. When installing the base plate 21 and the anchor bolts 12, a single bolt is first screwed into the threaded part of the anchor bolt 12. Then, a washer is placed above the bolt. The anchor bolts 12 are then inserted into the circular holes of the base plate 21. Finally, a washer and a double bolt are placed above the anchor bolts 12 to fix the anchor bolts 12 and the base plate 21 together. The web plate 22 is a cross-shaped web plate composed of two steel plates. The web plate 22 is vertically fixedly connected to the top of the bottom plate 21. Four fenders 23 are provided, and the four fenders 23 are fixedly connected to the four sides of the web plate 22 respectively. The fenders 23 are perpendicular to the web plate 22. A yoke plate 221 parallel to the bottom plate 21 is fixedly provided between the web plate 22 and the fenders 23. The yoke plate 221 is processed into an arc shape at the inside corner of the connection with the web plate 22, so that the center position of the yoke plate 221 forms a pouring hole 222. When pouring concrete at the transition layer, concrete can be poured into the bottom plate 21 through the pouring hole 222.

[0030] Reference Figures 3-5The connecting structure includes a slider 4 and a clamping structure 5. A T-shaped groove 233 is provided on the side of the fender 23 away from the web plate 22, running from top to bottom. The slider 4 is a T-shaped slider 4, which is slidably connected in the groove 233. The slider 4 is fixedly connected to the steel beam 3. A transmission cavity 232 is provided on the inner side of the fender 23. The clamping structure 5 includes a pressure plate 51, a guide rod 52, a wheel rod 53, and a clamping block 54. The guide rod 52 is fixedly installed in the transmission cavity 232 and is vertically arranged. A slide tube 521 is fitted on the outer side, and the slide tube 521 is slidably connected to the slide rail 231. A spring 522 is fixedly installed below the slide tube 521. The end of the spring 522 away from the slide tube 521 is fixedly connected to the fender 23. A groove 233 communicating with the transmission cavity 232 is opened below the slide rail 231. A pressure plate 51 is installed in the slide rail 231, and the pressure plate 51 passes through the groove 233 and is fixedly connected to the slide tube 521, so that the pressure plate 51 slides in the slide rail 231 and drives the slide tube 521 to slide along the guide rod 52. The wheel rod 53 is rotatably connected to the upper part of the transmission cavity 232, and the wheel rod 53 is perpendicular to the fender 23 with a slide rail 231 on the adjacent side. The first gear 531 and the second gear 532 are fixedly connected to the wheel rod 53. The first rack 523 is fixedly connected above the slide tube 521. The first rack 523 and the first gear 531 mesh. The clamping block 54 is fixedly connected to the second rack 541 at one end. The second rack 541 meshes with the second gear 532. The clamping hole 234 communicating with the slide rail 231 is opened at the upper part of the transmission cavity 232. The end of the clamping block 54 away from the second rack 541 passes through the clamping hole 234 and is slidably connected in the clamping hole 234. The clamping hole 234 is inclined. The end of the clamping hole 234 near the slide rail 231 is inclined downward. The lower surface of the end of the clamping block 54 near the slide rail 231 is a horizontal plane.

[0031] Reference Figure 3-5 When connecting the fender 23 and the steel beam 3, the slider 4 is slid into the slide rail 231. The slider 4 presses the pressure plate 51 downward at its lower end, causing the pressure plate 51 to drive the slide tube 521 to slide downward. This causes the first rack 523 to drive the first gear 531 and the wheel rod 53 to rotate, thereby driving the second gear 532 to rotate. This causes the second rack 541 and the clamping block 54 to slide towards the slide rail 231. Since the clamping hole 234 is inclined, the clamping block 54 moves towards the slide rail 231 while sliding downward, thus clamping and pressing the slider 4 into the slide rail 231. Since the lower surface of the clamping block 54 is horizontal, the contact area between the clamping block 54 and the slider 4 is larger, thus making the clamping block 54 fix the slider 4 more firmly, thereby fixing the fender 23 and the steel beam 3. The diameter of the first gear 531 is smaller than the diameter of the second gear 532, so that the downward movement distance of the pressure plate 51 is less than the downward movement distance of the clamping block 54, thereby reducing the distance between the pressure plate 51 and the clamping block 54, so that the clamping block 54 and the pressure plate 51 can clamp the slider 4.

[0032] Reference Figure 4 and Figure 5 A ratchet 6 is fixedly connected to one end of the wheel rod 53. A pawl 61 is provided in the transmission cavity 232 near the ratchet 6. The ratchet 6 and the pawl 61 cooperate. When the wheel rod 53 moves in the direction that causes the clamping block 54 to retract into the transmission cavity 232, the pawl 61 clamps the ratchet 6, thereby fixing the wheel rod 53 and the second gear 532. This prevents the clamping block 54 from moving in the direction that causes it to retract into the transmission cavity 232, which would result in the slider 4 not being fixed firmly.

[0033] Reference Figure 5 Multiple threaded holes are provided on the surface of the fender 23 where the slide rail 231 is located, and multiple threaded holes are provided on the surface of the slider 4. When the slider 4 is fixed in the slide rail 231, the threaded holes of the fender 23 are aligned with the threaded holes of the slider 4. After the slider 4 is fixed by the clamping structure 5, bolts can be screwed into the threads to reinforce the fixation of the fender 23 and the steel beam 3, making the seismic unit more robust.

[0034] Reference Figure 5 The steel beam 3 is an I-beam, and stiffening plates 31 are installed on the steel beam 3 to reinforce the I-beam. This type of steel beam 3 is lightweight while having strong compressive and tensile strength. Multiple circular holes are opened on the surface of the steel beam 3 and the vertical structure 2. After the seismic unit is installed, steel bars can be passed through the circular holes to fix the seismic unit, making the seismic unit more stable.

[0035] This application also provides a steel seismic unit for structural transfer layers, comprising the following steps: S1. After the reinforcement of the lower concrete column 7 is tied and the formwork is erected, before the concrete is poured, the embedded part 1 is pre-installed according to the preset elevation and position of the seismic unit, and then the embedded part 1 is welded and fixed to the reinforcement of the lower concrete column 7. S2. Pour the lower concrete column 7 to the design elevation. After the lower concrete has solidified to the required strength, remove the concrete column formwork. Screw a single nut into the hook-shaped end of each anchor bolt 12 and install a washer. S3. Insert one end of the anchor bolt 12 installation washer into the bottom of the base plate 21. Then, install the washer at each connection between the anchor bolt 12 and the base plate 21 and screw in the double bolts to fix the anchor bolt 12 to the base plate 21. Then, fix the double nuts by electric welding. S4. Insert the slider 4 into the slide rail 231 and slide the slider 4 down along the slide rail 231, so that the clamping block 54 clamps the slider 4 in the slide groove 233. Then screw the bolt into the threaded hole on the fender 23 to further fix the steel beam 3 on the fender 23. Pass the steel bars through the round holes of the vertical structure 2 and the steel beam 3 according to the predetermined connection method and fix the steel bars to the vertical structure 2 and the steel beam 3 by welding. Then install the beam and column formwork.

[0036] S5. Pour concrete into the beam and column formwork. Reserve a position above the short column for connection with the upper steel column 9. After the concrete strength reaches the required level, remove the beam and column formwork and install the upper steel column 9.

[0037] In summary, this application segments the seismic unit, allowing for segmented installation, which facilitates installation by operators. Furthermore, this seismic unit has a stable structure and, compared to ordinary seismic units, greater load-bearing and compressive strength, while also being lighter in weight. This improves the installation accuracy and speed of the seismic unit at the beam-column joint of the transfer layer between the concrete structure and the rigid concrete structure.

[0038] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A structural transition layer at type steel seismic unit, characterized in that: The structure includes embedded parts (1), vertical structure (2), and steel beam (3). The embedded parts (1) include eight vertically set anchor bolts (12) and double-layer positioning plates (11). One end of the anchor bolts (12) is hook-shaped. The eight anchor bolts (12) are fixedly connected to the same double-layer positioning plate (11). The vertical structure (2) includes a base plate (21), a short column web plate (22) welded from steel plates into a cross shape, and a flange plate (23) set around the web plate (22). The base plate (21) is fixedly set on the end of the anchor bolts (12) away from the hook shape. The short column web plate (22) is set vertically on the surface of the base plate (21). The surface of the flange plate (23) is perpendicular to the web plate (22). The steel beam (3) is connected to the side of the flange plate (23) away from the web plate (22). A connection structure is set at the connection between the flange plate (23) and the steel beam (3). The connection structure includes a slider (4) and a clamping structure (5). A T-shaped slide rail (231) is provided on the side of the fender (23) connecting the steel beam (3) from top to bottom. The slider (4) is slidably connected in the T-shaped slide rail (231). The slider (4) is fixedly connected to the steel beam (3). The clamping structure (5) is connected inside the fender (23).

2. The steel seismic unit at the structural transfer layer according to claim 1, characterized in that: A yoke plate (221) is provided between the web plate (22) and the fender (23). The yoke plate (221) is parallel to the bottom plate (21), and a casting hole (222) is provided on the surface of the yoke plate (221).

3. The steel seismic unit at the structural transfer layer according to claim 1, characterized in that: The steel beam (3) is a steel beam (3) composed of I-beams, and the steel beam (3) is fixedly connected with stiffening plates (31) for reinforcing the steel beam (3).

4. The steel seismic unit at the structural transfer layer according to claim 1, characterized in that: The fender (23) has a transmission cavity (232) inside. The clamping structure (5) includes a pressure plate (51), a guide rod (52), a wheel rod (53), and a clamping block (54). The guide rod (52) is vertically arranged in the transmission cavity (232). A slide tube (521) is slidably connected to the outside of the guide rod (52). A spring (522) is fixedly connected to one end of the slide tube (521). The end of the spring (522) away from the slide tube (521) is fixedly connected to the fender (23). A groove (233) communicating with the transmission cavity (232) is opened at the lower position of the T-shaped slide rail (231). The pressure plate (51) is slidably connected in the slide rail (231). The pressure plate (51) passes through the groove (233) and is fixed to the slide tube (521). A first rack (523) is fixedly connected above the slide tube (521). The two ends of the wheel rod (53) are rotatably connected to the upper position of the transmission cavity (232). A first gear (531) is fixedly connected to the wheel rod (53), and the first gear (531) meshes with the first rack (523). A second gear (532) is fixedly installed on the wheel rod (53). A second rack (541) is fixedly connected to one end of the clamping block (54), and the second gear (532) meshes with the second rack (541). A clamping hole (234) communicating with the slide rail (231) is opened at the upper position of the transmission cavity (232). The end of the clamping block (54) away from the rack passes through the clamping hole (234) and exits the transmission cavity (232).

5. The steel seismic unit at the structural transfer layer according to claim 4, characterized in that: One end of the wheel rod (53) is fixedly connected to a ratchet (6), and a pawl (61) is connected inside the transmission cavity (232). The ratchet (6) and the pawl (61) cooperate with each other. When the wheel rod (53) rotates in the direction that causes the clamping block (54) to retract into the transmission cavity (232), the pawl (61) clamps the ratchet (6).

6. The steel seismic unit at the structural transfer layer according to claim 5, characterized in that: The clamping hole (234) is opened at an angle, and the clamping hole (234) is inclined downward on the side near the slide rail (231).

7. The steel seismic unit at the structural transfer layer according to claim 1, characterized in that: The fender (23) is connected to the steel beam (3) with multiple threaded holes at one end, and the slider (4) is connected to the fender (23) with multiple threaded holes at the location where the threaded holes are located.

8. A steel seismic unit for structural transfer layers according to any one of claims 1-7, characterized in that: The installation and construction method of the seismic unit at the structural transfer layer includes the following steps: S1. After the reinforcement of the lower concrete column (7) is tied and the formwork is erected, before the concrete is poured, the embedded parts (1) are pre-embedded and installed according to the preset elevation and position of the seismic unit, and then the embedded parts (1) are welded and fixed to the reinforcement of the lower concrete column (7). S2. Pour the lower concrete column (7) to the design elevation. After the lower concrete has solidified to the required strength, remove the concrete column formwork. Screw a single nut into the hook-shaped end of each anchor bolt (12) and install a washer. S3. Insert one end of the anchor bolt (12) installation washer into the bottom plate (21), then install washer at the connection between each anchor bolt (12) and the bottom plate (21) and screw in double bolts to fix the anchor bolt (12) and the bottom plate (21), and randomly weld the double nuts to fix them. S4. Fix the steel beam (3) and the fender (23) together through the connecting structure, pass the steel bars through the vertical structure (2) and the steel beam (3) according to the predetermined connection method, and fix the steel bars to the vertical structure (2) and the steel beam (3) by welding, and then install the beam and column formwork; S5. Pour concrete into the beam and column formwork. Reserve a position above the short column to connect with the upper steel column (9). After the concrete strength reaches the required level, remove the beam and column formwork and install the upper steel column (9).

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