Connecting joint of PEC special-shaped composite shear wall and construction method

Abstract

The invention relates to the field of fabricated buildings, in particular to a connecting joint of a PEC special-shaped composite shear wall and a construction method.The connecting joint comprises a weak-axis PEC connecting wall limb and a strong-axis PEC connecting wall limb, a first fixing base is fixedly installed on a web of the weak-axis PEC connecting wall limb, and a second fixing base is fixedly installed on an outer flange of the strong-axis PEC connecting wall limb; the first fixing seat and the second fixing seat are similar to pi-shaped structures and are provided with fixing holes, the weak-axis PEC connecting wall column and the strong-axis PEC connecting wall column connect the first fixing seat and the second fixing seat through bolts to form an L-shaped or T-shaped connecting node, and a connecting gap between the weak-axis PEC connecting wall column and the strong-axis PEC connecting wall column is filled and leveled up with mortar. The process complexity of the prefabricated wall column can be reduced, concrete pouring in a factory is easy, and transportation of the wall column is also facilitated.

Description

Technical Field

[0001] The present invention relates to the field of prefabricated buildings, and particularly to a connection node and a construction method of a PEC special-shaped composite shear wall. Background Art

[0002] Partially encased steel-concrete composite shear walls (referred to as PEC composite shear walls for short) use an I-beam or a hot-rolled thin steel plate composite section, and transverse tie bars are arranged on both sides of the web between the two end flanges. Finally, concrete is poured on both sides of the web in the factory. PEC composite shear walls are divided into straight-shaped, L-shaped, and T-shaped. The straight-shaped ones are more convenient for assembly and transportation, but in actual structural projects, T-shaped or L-shaped structures are widely used to meet the design index verification. As special-shaped structures, L-shaped and T-shaped structures mostly use welding and assembly in the factory in the prior art, making the processing technology of special-shaped PEC composite shear walls complex. It is difficult to pour them flat during factory pouring and requires multiple flips. Moreover, special-shaped PEC composite shear walls are heavy, and the transportation and hoisting costs are also relatively high. Summary of the Invention

[0003] In order to solve the problems of complex manufacturing process, high cost, and difficult transportation of special-shaped PEC composite shear walls, the present invention discloses a connection node of a PEC special-shaped composite shear wall, which can be formed by on-site assembly of straight-shaped PEC composite shear walls, greatly reducing the design and process difficulties as well as costs.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] A connection node of a PEC special-shaped composite shear wall includes a weak-axis PEC connecting wall member and a strong-axis PEC connecting wall member. Both the weak-axis PEC connecting wall member and the strong-axis PEC connecting wall member each include a steel skeleton, stirrups, and concrete. The steel skeleton includes side columns at both ends and a web connecting the two end side columns. The side column is composed of flanges at both ends and a web connecting the two end flanges. Stirrups are arranged at intervals on both sides of the web of the steel skeleton, and the stirrups are perpendicular to the flanges. A first fixing seat is welded on the web of the weak-axis PEC connecting wall member, and a second fixing seat is welded on the outer flange of the side column of the strong-axis PEC connecting wall member. Concrete is filled on both sides of the web of the weak-axis PEC connecting wall member and on both sides of the web of the strong-axis PEC connecting wall member. Part of the first fixing seat and part of the second fixing seat are exposed outside the concrete.

[0006] The first fixing seat includes a first connecting plate, a second connecting plate and a first stiffening plate. The first connecting plate is perpendicularly and fixedly connected to the second connecting plate. Two first stiffening plates are arranged at intervals on the first connecting plate. The first stiffening plates are perpendicular to both the first connecting plate and the second connecting plate. One side of the first stiffening plate is fixed on the first connecting plate, and the other side of the first stiffening plate is fixed on the second connecting plate. A first fixing hole is formed between the two first stiffening plates on the first connecting plate. The second fixing seat includes a third connecting plate and a second stiffening plate. Two second stiffening plates are arranged at intervals on the same side of the third connecting plate. The second stiffening plates are perpendicularly fixed on the third connecting plate. A second fixing hole is formed between the two second stiffening plates on the third connecting plate.

[0007] The weak-axis PEC connecting wall limb and the strong-axis PEC connecting wall limb are connected to form an L-shaped or T-shaped connection node. The connection node is fixedly connected through the first fixing seat and the second fixing seat. The first fixing seat is located above the second fixing seat. The first fixing hole and the second fixing hole are vertically corresponding. A screw passes through the first fixing hole and the second fixing hole. Two nuts are sleeved on the screw between the first connecting plate and the third connecting plate. One nut is sleeved on the screw above the first connecting plate and the other nut is sleeved on the screw below the third connecting plate. The connection gap between the weak-axis PEC connecting wall limb and the strong-axis PEC connecting wall limb is filled with mortar.

[0008] Furthermore, the thicknesses of both the first connecting plate and the second connecting plate are greater than the thickness of the first stiffening plate, and the thickness of the third connecting plate is greater than the thickness of the second stiffening plate.

[0009] Furthermore, the thicknesses of both the first connecting plate and the second connecting plate are 20 mm, the thickness of the first stiffening plate is 8 mm to 10 mm, the thickness of the third connecting plate is 20 mm, the thickness of the second stiffening plate is 8 mm to 10 mm, and the diameters of both the first fixing hole and the second fixing hole are 35 mm.

[0010] Furthermore, after the first fixing seat and the second fixing seat are connected, the distance between the first connecting plate and the third connecting plate is 50 mm.

[0011] Furthermore, when the weak-axis PEC connecting wall limb and the strong-axis PEC connecting wall limb are connected to form an L-shaped connection node, the first fixing seat is installed on the web of the side column of the weak-axis PEC connecting wall limb; when the weak-axis PEC connecting wall limb and the strong-axis PEC connecting wall limb are connected to form a T-shaped connection node, the first fixing seat is installed on the web between the two end side columns of the weak-axis PEC connecting wall limb.

[0012] Furthermore, after the first fixing seat is installed on the weak-axis PEC connecting wall limb, the top surface of the first stiffening plate is inclined relative to the first connecting plate; after the second fixing seat is installed on the strong-axis PEC connecting wall limb, the bottom surface of the second stiffening plate is inclined relative to the third connecting plate.

[0013] Furthermore, after the weak-axis PEC connecting wall limb and the strong-axis PEC connecting wall limb are connected, the top surface of the first stiffening plate is parallel to the bottom surface of the second stiffening plate.

[0014] The present invention also discloses a construction method for the connecting node of the PEC special-shaped composite shear wall, including the following steps:

[0015] Step 1): Assemble the steel skeleton in the factory;

[0016] Step 2): Assemble the first fixing seat and the second fixing seat in the factory;

[0017] Step 3): In the factory, weld the second connecting plate of the first fixing seat on the web of the steel skeleton of the weak-axis PEC connecting wall limb, and weld the side end of the third connecting plate of the second fixing seat on the outer flange of the side column of the steel skeleton of the strong-axis PEC connecting wall limb;

[0018] Step 4): After completing Step 3), weld stirrups on both sides of the web in each grid of the two steel skeletons provided with the first fixing seat and the second fixing seat in the factory;

[0019] Step 5): Pour concrete on both sides of the web in each grid of the two steel skeletons that have completed Step 4) in the factory, so that the connecting ends of the first fixing seat and the connecting ends of the second fixing seat are both exposed outside the concrete;

[0020] Step 6): At the construction site, align the first fixing seat on the weak-axis PEC connecting wall limb with the second fixing seat on the strong-axis PEC connecting wall limb, and fixedly connect the first fixing seat and the second fixing seat with screws and nuts;

[0021] Step 7): Spray mortar at the connection gap between the weak-axis PEC connecting wall limb and the strong-axis PEC connecting wall limb to fill it up.

[0022] Furthermore, in the said Step 1), first fabricate the side columns, and then weld the side columns at both ends together with the web.

[0023] Furthermore, in the said Step 2), the assembly sequence of the first fixing seat is as follows: first open the first fixing holes on the first connecting plate, then vertically weld the two first stiffening plates on the first connecting plate, and finally weld and fix the second connecting plate to the first stiffening plate and the first connecting plate respectively; the assembly sequence of the second fixing seat is as follows: first open the second fixing holes on the third connecting plate, and then vertically weld the two second stiffening plates on the third connecting plate.

[0024] In the present invention, the weak-axis PEC connecting wall members in the shape of a straight line and the strong-axis PEC connecting wall members in the shape of a straight line are prefabricated separately in the factory. At the construction site, the required special-shaped structure can be formed only by bolt connection. The single-piece PEC wall members in the shape of a straight line prefabricated in the factory not only have a simple manufacturing process, but also facilitate the pouring of concrete, and are more conducive to transportation and hoisting construction. Compared with directly forming special-shaped shear walls by welding and splicing in the factory in the prior art, the manufacturing cost is greatly reduced.

[0025] In addition, in the prior art, special-shaped PEC composite shear walls are directly welded in the factory. The shear walls of this structure jointly bear shear force, bending moment and axial force as a whole; while in the present invention, a special-shaped structure is formed by combining two wall members with a fixed seat similar to a π shape through high-strength bolts. The fixed seat is designed by calculating the shear force and axial force at the connection node of the fixed seat, which can ensure the strength of the joint area, so that the connection node fails after the wall member, to ensure the stability and seismic resistance of the component, and there are certain differences from the prior art in terms of mechanical principles. Description of the Drawings

[0026] Figure 1 is an explosion view of the steel skeleton;

[0027] Figure 2 is a schematic structural view of the weak-axis PEC connecting wall member before pouring concrete;

[0028] Figure 3 is a schematic structural view of the strong-axis PEC connecting wall member before pouring concrete;

[0029] Figure 4 is a schematic structural view of the prefabricated weak-axis PEC connecting wall member;

[0030] Figure 5 is a schematic structural view of the prefabricated strong-axis PEC connecting wall member;

[0031] Figure 6 is a schematic structural view of the first fixed seat;

[0032] Figure 7 is a schematic structural view of the second fixed seat;

[0033] Figure 8 is a top view of the L-shaped composite shear wall formed by connecting the weak-axis PEC connecting wall member and the strong-axis PEC connecting wall member;

[0034] Figure 9 is a top view of the T-shaped composite shear wall formed by connecting the weak-axis PEC connecting wall member and the strong-axis PEC connecting wall member;

[0035] Figure 10 is an elevation view of the L-shaped composite shear wall formed by connecting the weak-axis PEC connecting wall member and the strong-axis PEC connecting wall member;

[0036] Figure 11 is Figure 10 a partial enlarged view of the circled part in

[0037] Figure 12 is Figure 10 a schematic diagram after filling mortar at the joint in

[0038] Reference numerals:

[0039] 1. Edge column; 2. Web; 3. Stirrup; 4. First fixing seat; 41. First connecting plate; 42. Second connecting plate; 43. First stiffening plate; 44. First fixing hole; 5. Second fixing seat; 51. Third connecting plate; 52. Second stiffening plate; 53. Second fixing hole; 6. Weak-axis PEC connecting wall member; 7. Strong-axis PEC connecting wall member; 8. Concrete; 9. Mortar; 10. Screw; 11. Nut. Specific embodiments

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0041] This embodiment discloses a connection node of a PEC special-shaped composite shear wall, where the special shape refers to forming an L-shaped or T-shaped connection node. The PEC special-shaped composite shear wall is assembled on-site by two prefabricated one-piece wall members. On the two one-piece wall members that are connected to each other, a first fixing seat 4 is installed on one wall member, and a second fixing seat 5 is installed on the other wall member. The two wall members are connected by bolts to connect the first fixing seat 4 and the second fixing seat 5 to form a special-shaped structure. For the convenience of distinction, the wall member with the first fixing seat 4 installed is called the weak-axis PEC connecting wall member 6, and the wall member with the second fixing seat 5 installed is called the strong-axis PEC connecting wall member 7. The structures of the weak-axis PEC connecting wall member 6 and the strong-axis PEC connecting wall member 7 are similar, and the main difference lies in the different structures and positions of the fixing seats installed on each of them.

[0042] Both types of wall members are mainly composed of a steel skeleton, stirrups 3 and concrete 8. Among them, the steel skeleton is as Figure 1 shown, and according to the position, it can be divided into edge columns 1 at both ends and webs 2 connecting the two edge columns 1 at both ends. The edge column 1 is assembled into an I-shaped structure by flanges at both ends and a web connecting the two flanges at both ends. After the assembled edge columns 1 are connected by webs 2 to form a steel skeleton, the first fixing seat 4 and the second fixing seat 5 are respectively installed on the two steel skeletons. For the weak-axis PEC connecting wall member 6, the first fixing seat 4 is installed on the web 2 of the steel skeleton. If it is necessary to form an L-shaped composite shear wall as Figure 8 shown, then the first fixing seat 4 is installed on the web 2 within the grid of the edge column 1 as Figure 2 shown. If it is necessary to form an L-shaped composite shear wall as Figure 9For the T-shaped composite shear wall shown, the first fixing seat 4 needs to be installed on the web 2 between the side columns 1. For the strong-axis PEC connected wall member 7, the second fixing seat 5 is installed on the outer wall of the flange outside the side column 1 as shown in Figure 3 . After installing the above fixing seats, then as shown in Figure 2 and Figure 3 , stirrups 3 are respectively arranged on both sides of the web 2 in each grid of the corresponding steel skeleton. The stirrups 3 are arranged at intervals vertically and are arranged horizontally. The two ends of the stirrups 3 are welded to the adjacent flanges. Finally, concrete 8 is poured on both sides of the web 2 in each grid of the steel skeleton. It should be noted that the connecting ends of the fixing seats need to be exposed outside the concrete 8, and are respectively prefabricated into the weak-axis PEC connected wall member 6 as shown in Figure 4 and the strong-axis PEC connected wall member 7 as shown in Figure 5 .

[0043] The structure of the first fixing seat 4 is as shown in Figure 6 , and it is assembled by a first connecting plate 41, a second connecting plate 42 and two first stiffening plates 43. In this embodiment, the thicknesses of the first connecting plate 41 and the second connecting plate 42 are 20 mm, and the thickness of the first stiffening plate 43 is 8 mm - 10 mm. First, a first fixing hole 44 with a diameter of 35 mm is opened on the first connecting plate 41, and then the two first stiffening plates 43 are welded to the first connecting plate 41 perpendicular to the first connecting plate 41, so that the first fixing hole 44 is between the two first stiffening plates 43. Finally, the second connecting plate 42 is arranged perpendicular to the first connecting plate 41, and the side ends of the first connecting plate 41 and the side ends of the first stiffening plates 43 are welded to the second connecting plate 42 together. In this embodiment, the cross-section of the first stiffening plate 43 is a right-angled trapezoid, as shown in Figure 6 and Figure 11 , and the top surface of the first stiffening plate 43 is inclined relative to the top surface of the first connecting plate 41.

[0044] The structure of the second fixing seat 5 is as shown in Figure 7 , and it is assembled by a third connecting plate 51 and two second stiffening plates 52. In this embodiment, the thickness of the third connecting plate 51 is 20 mm, and the thickness of the second stiffening plate 52 is 8 mm - 10 mm. First, a second fixing hole 53 with a diameter of 35 mm is opened on the third connecting plate 51, and then the two second stiffening plates 52 are welded to the same surface of the third connecting plate 51 perpendicular to the third connecting plate 51, so that the second fixing hole 53 is between the two second stiffening plates 52. The cross-section of the second stiffening plate 52 in this embodiment is also a right-angled trapezoid, as shown in Figure 11As shown, the side of the second stiffening plate 52 away from the third connecting plate 51 is inclined relative to the surface of the third connecting plate 51. After the first fixing seat 4 and the second fixing seat 5 are fixedly connected by bolts or screws and nuts, the top surface of the first stiffening plate 43 is substantially parallel to the bottom surface of the second stiffening plate 52.

[0045] When the prefabricated weak-axis PEC connecting wall member 6 is connected to the strong-axis PEC connecting wall member 7, taking Figure 10 the L-shaped composite shear wall shown as an example, the first fixing seat 4 and the second fixing seat 5 are arranged vertically opposite to each other, with the first fixing seat 4 above the second fixing seat 5, and the first fixing hole 44 and the second fixing hole 53 are vertically corresponding. A screw 10 or a bolt is sequentially passed through the first fixing hole 44 and the second fixing hole 53. Before the screw 10 or the bolt is inserted, two nuts 11 are sleeved on the screw 10 or the bolt. If the screw 10 is used, another nut 11 is sleeved on the screw 10 above the first connecting plate 41, and a nut 11 is also sleeved on the screw 10 below the third connecting plate 51. If a bolt is used, a nut 11 is directly sleeved on the screw 10 below the third connecting plate 51. After installation in the above manner, the vertical distance between the first connecting plate 41 and the third connecting plate 51 is 50 mm, and the bolt connection allows an installation error of ±10 mm. The combination of the screw 10 and the four nuts 11 can ensure a certain stiffness, provide stiffness to the wall surface out of plane, and improve the out-of-plane stability of the special-shaped wall member. After the above connection is completed, as Figure 12 shown, finally, mortar 9 is sprayed at the connection gap between the weak-axis PEC connecting wall member 6 and the strong-axis PEC connecting wall member 7 to fill the gap.

[0046] The construction method of the PEC special-shaped composite shear wall connection node given above is constructed according to the steps given below:

[0047] Step 1): First, complete the assembly of the steel skeleton in the factory;

[0048] Step 2): Respectively complete the assembly of the first fixing seat 4 and the second fixing seat 5 in the factory;

[0049] Step 3): In the factory, respectively weld the second connecting plate 42 of the first fixing seat 4 to the web 2 of the steel skeleton of the weak-axis PEC connecting wall member 6, and weld the side end of the third connecting plate 51 of the second fixing seat 5 to the outer flange of the side column 1 of the steel skeleton of the strong-axis PEC connecting wall member 7;

[0050] Step 4): After completing Step 3), respectively weld stirrups 3 on both sides of the web 2 in each grid of the two steel skeletons provided with the first fixing seat 4 and the second fixing seat 5 in the factory;

[0051] Step 5): Pour concrete 8 on both sides of the web 2 in each grid of the two steel skeletons that have completed Step 4) in the factory, so that the connection ends of the first fixing seat 4 and the connection ends of the second fixing seat 5 are both exposed outside the concrete 8;

[0052] Step 6): At the construction site, make the first fixing seat 4 on the weak-axis PEC connecting wall member 6 and the second fixing seat 5 on the strong-axis PEC connecting wall member 7 face each other vertically, and fixedly connect the first fixing seat 4 and the second fixing seat 5 with screws 10 or bolts and nuts 11;

[0053] Step 7): Spray mortar 9 at the connection gap between the weak-axis PEC connecting wall member 6 and the strong-axis PEC connecting wall member 7 to fill it up.

[0054] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A connection node of a PEC special-shaped combined shear wall, characterized in that: It includes a weak-axis PEC-connected wall member and a strong-axis PEC-connected wall member. Both the weak-axis PEC-connected wall member and the strong-axis PEC-connected wall member each include a steel skeleton, stirrups and concrete. The steel skeleton includes side columns at both ends and a web connecting the side columns at both ends. The side column is composed of flanges at both ends and a web connecting the flanges at both ends. Stirrups are arranged at intervals on both sides of the web of the steel skeleton, and the stirrups are perpendicular to the flanges; a first fixing seat is welded on the web of the weak-axis PEC-connected wall member, and a second fixing seat is welded on the outer flange of the side column of the strong-axis PEC-connected wall member. Concrete is filled on both sides of the web of the weak-axis PEC-connected wall member and on both sides of the web of the strong-axis PEC-connected wall member. Part of the first fixing seat and part of the second fixing seat are both exposed outside the concrete; The first fixing seat includes a first connecting plate, a second connecting plate and a first stiffening plate. The first connecting plate and the second connecting plate are perpendicularly and fixedly connected. Two first stiffening plates are arranged at intervals on the first connecting plate. The first stiffening plates are perpendicular to the first connecting plate and the second connecting plate respectively. One side of the first stiffening plate is fixed on the first connecting plate, and the other side of the first stiffening plate is fixed on the second connecting plate. A first fixing hole is opened between the two first stiffening plates on the first connecting plate; the second fixing seat includes a third connecting plate and a second stiffening plate. Two second stiffening plates are arranged at intervals on the same side of the third connecting plate. The second stiffening plates are perpendicularly fixed on the third connecting plate. A second fixing hole is opened between the two second stiffening plates on the third connecting plate; The weak-axis PEC-connected wall member and the strong-axis PEC-connected wall member are connected to form an L-shaped or T-shaped connection node. The connection node is fixedly connected through the first fixing seat and the second fixing seat. The first fixing seat is located above the second fixing seat. The first fixing hole and the second fixing hole are vertically corresponding. A screw passes through the first fixing hole and the second fixing hole. Two nuts are sleeved on the screw between the first connecting plate and the third connecting plate. One nut is sleeved on the screw above the first connecting plate and one nut is sleeved on the screw below the third connecting plate respectively. The connection gap between the weak-axis PEC-connected wall member and the strong-axis PEC-connected wall member is filled with mortar.

2. The connection node of a PEC special-shaped composite shear wall according to claim 1, characterized in that: The thicknesses of the first connecting plate and the second connecting plate are both greater than the thickness of the first stiffening plate, and the thickness of the third connecting plate is greater than the thickness of the second stiffening plate.

3. The connection node of a PEC special-shaped combined shear wall according to claim 2, characterized in that: The thicknesses of the first connecting plate and the second connecting plate are both 20 mm, the thickness of the first stiffening plate is 8 mm - 10 mm, the thickness of the third connecting plate is 20 mm, the thickness of the second stiffening plate is 8 mm - 10 mm, and the diameters of the first fixing hole and the second fixing hole are both 35 mm.

4. The connection node of a PEC special-shaped composite shear wall according to claim 1, characterized in that: After the first fixing seat and the second fixing seat are connected, the distance between the first connecting plate and the third connecting plate is 50 mm.

5. The connection node of a PEC special-shaped composite shear wall according to claim 1, characterized in that: When the weak-axis PEC-connected wall member and the strong-axis PEC-connected wall member are connected to form an L-shaped connection node, the first fixing seat is installed on the web of the side column of the weak-axis PEC-connected wall member; when the weak-axis PEC-connected wall member and the strong-axis PEC-connected wall member are connected to form a T-shaped connection node, the first fixing seat is installed on the web between the side columns at both ends of the weak-axis PEC-connected wall member.

6. The connection node of a PEC special-shaped composite shear wall according to claim 1, characterized in that: After the first fixing seat is installed on the weak-axis PEC connecting wall limb, the top surface of the first stiffening plate is inclined relative to the first connecting plate; after the second fixing seat is installed on the strong-axis PEC connecting wall limb, the bottom surface of the second stiffening plate is inclined relative to the third connecting plate.

7. The connection node of a PEC special-shaped composite shear wall according to claim 6, characterized in that: After the weak-axis PEC connecting wall limb and the strong-axis PEC connecting wall limb are connected, the top surface of the first stiffening plate is parallel to the bottom surface of the second stiffening plate.

8. The construction method of the PEC special-shaped combined shear wall connection joint according to any one of claims 1-7, characterized in that, It includes the following steps: Step 1): Assemble the steel skeleton in the factory. Step 2): Assemble the first fixing seat and the second fixing seat in the factory. Step 3): In the factory, weld the second connecting plate of the first fixing seat to the web of the weak-axis PEC connecting wall limb steel skeleton, and weld the side end of the third connecting plate of the second fixing seat to the outer flange of the side column of the strong-axis PEC connecting wall limb steel skeleton. Step 4): After completing Step 3), weld stirrups on both sides of the web in each grid of the two steel skeletons provided with the first fixing seat and the second fixing seat in the factory. Step 5): Pour concrete on both sides of the web in each grid of the two steel skeletons that have completed Step 4) in the factory, so that the connecting ends of the first fixing seat and the connecting ends of the second fixing seat are both exposed outside the concrete. Step 6): At the construction site, oppose the first fixing seat on the weak-axis PEC connecting wall limb to the second fixing seat on the strong-axis PEC connecting wall limb, and fixedly connect the first fixing seat and the second fixing seat with screws and nuts. Step 7): Spray mortar at the connection gap between the weak-axis PEC connecting wall limb and the strong-axis PEC connecting wall limb to level it.

9. The construction method according to claim 8, characterized in that: In the said Step 1), first fabricate the side columns, and then weld the side columns at both ends together with the web.

10. The construction method according to claim 8, characterized in that: In the said Step 2), the assembly sequence of the first fixing seat is as follows: first, open the first fixing holes on the first connecting plate, then vertically weld the two first stiffening plates to the first connecting plate, and finally weld the second connecting plate to the first stiffening plate and the first connecting plate respectively for fixation; the assembly sequence of the second fixing seat is as follows: first, open the second fixing holes on the third connecting plate, and then vertically weld the two second stiffening plates to the third connecting plate.

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