Multi-high story fabricated steel structure frame support system and construction method

Abstract

The application relates to the technical field of steel structures, in particular to a multi-high-level fabricated steel structure frame support system and a construction method, which comprises a unit layer and a support column, the unit layer comprises a frame arranged on the support column and a paving layer arranged on the frame. The floor is divided into multiple smaller parts through the arrangement of side edge plates and a center plate, the paving plates are fixed in the clamping grooves between the upper connecting rods and the lower connecting rods, the position of the floor can be adjusted, the upper connecting rods and the lower connecting rods are matched with the arrangement of the fixed plate one and the fixed plate two, the fixing can be completed without aligning the bolts, the difficulty of assembly is reduced, the stability of the floor connection is improved, the support force is provided for the center mounting seat through the arrangement of the steel cable, the support column is avoided, and the use area of the unit layer is improved.

Description

Technical Field

[0001] This invention relates to the field of steel structure technology, specifically to a multi-story prefabricated steel structure frame support system and construction method. Background Technology

[0002] CN102979174A discloses a multi-story prefabricated steel structure frame system, belonging to the field of structural engineering technology, which includes prefabricated beams and slabs and prefabricated columns. In this system, the prefabricated beams and slabs consist of floor slabs, column base nodes, and hollow steel beams with steel web members. The hollow steel beams are connected to the column base nodes, and the floor slabs are supported on the hollow steel beams. The prefabricated columns consist of box columns and flange plates. During construction, the prefabricated beams and slabs and prefabricated columns can be spliced ​​together to form a frame structure.

[0003] However, when installing the floor slabs in the aforementioned multi-story prefabricated steel frame support system, the floor slabs are a large-area unit. During hoisting, their position must be precisely adjusted to align with the studs in order to complete the installation. The floor slabs are large in volume and weight, making it difficult to adjust their position. Furthermore, the prefabricated columns surrounded by the floor slabs will reduce the actual usable area of ​​the floor slabs. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-story prefabricated steel structure frame support system and construction method to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: On the one hand, a multi-story prefabricated steel structure frame support system is provided, including: Unit layers, wherein the unit layers are connected by support columns; The unit layer includes a frame disposed on the support column and a paving layer disposed on the frame; The frame includes a side mounting base disposed on the support column, a center mounting base disposed at the center of the side mounting base, a side connecting rod connecting two adjacent side mounting bases, a center connecting rod disposed between the center mounting base and the side mounting bases, and a load-bearing component disposed between the center mounting base and the side mounting bases for supporting the center mounting base; The paving layer includes a side plate with one end inserted in the side connecting rod and the other end inserted in the central connecting rod, and a central plate located between the side plates.

[0006] Preferably, both the side mounting base and the center mounting base include a base body, and the side mounting base further includes a load-bearing seat disposed on the base body.

[0007] Preferably, the base includes a cylindrical body, a base plate disposed at both ends of the cylindrical body, and a limiting plate disposed on the base plate. The cylindrical body is alternately provided with a mounting surface and a steel cable surface. A steel cable through hole is provided on the steel cable surface. The limiting plate and the mounting surface are disposed opposite to each other.

[0008] Preferably, both the side connecting rod and the center connecting rod include a clamping plate disposed on the cylinder, an upper connecting rod and a lower connecting rod inserted between the clamping plate and the limiting plate and arranged symmetrically.

[0009] Preferably, a limiting groove is provided between the clamping plate and the limiting plate, a support plate is provided in the middle of the clamping plate, and a rod mounting groove is provided between the support plate and the clamping plate.

[0010] Preferably, a flat plate clamping groove is provided between the upper connecting rod and the lower connecting rod. Both the upper connecting rod and the lower connecting rod include a rod body disposed on the support plate and inserted into the rod body mounting groove, an insert plate disposed on the rod body and inserted into the limiting groove, and a reinforcing plate disposed on the rod body.

[0011] Preferably, the load-bearing component includes a transition plate with both ends inserted into the flat plate clamping groove of the side connecting rod and passing through the flat plate clamping groove of the central connecting rod; a bending pulley disposed on the transition plate; a bending frame disposed on the load-bearing seat; a bending rod disposed on the bending frame; a displacement groove formed on the load-bearing seat; a steel cable connecting block disposed on the load-bearing seat and passing through the displacement groove; a displacement block disposed on the steel cable connecting block; a threaded base disposed on the load-bearing seat; a fastening screw passing through the displacement block and inserted into the threaded base; a load-bearing base plate disposed on the central mounting seat; and a steel cable disposed on the load-bearing base plate, passing around the bending pulley, passing through the steel cable through the steel cable hole, passing around the bending rod, and connecting to the steel cable connecting block.

[0012] Preferably, the side plate includes a base plate, an insert plate that is disposed on the base plate and inserted into the flat plate clamping groove, an overlapping clamp plate 1 and an overlapping clamp plate 2 disposed on the base plate and mounted on the upper connecting rod, and a floor plate 1 disposed on the base plate. The floor plate 1 and the base plate 1 are provided with fitting grooves that match the substrate.

[0013] Preferably, the center plate includes a second base plate, a second insert plate disposed on the second base plate and inserted into the slot of the flat plate, a third overlapping clamp plate disposed on the second base plate and erected on the upper connecting rod, and a second floor plate disposed on the second base plate, wherein the length direction of the second floor plate is perpendicular to the length direction of the transition plate.

[0014] On the other hand, a construction method based on the multi-story prefabricated steel structure frame support system described in any of the above-mentioned embodiments is also provided, including: S1: Install the support column on the foundation using fasteners; S2: Install the side mounting base on the support column using fasteners, and install the clamping plate on the cylinder of the side mounting base using fasteners; S3: Install the upper connecting rod on the side mounting seat located between the two side mounting seats, push the lower connecting rod laterally onto the support plate, so that the insert plate is inserted into the limiting groove, the lower connecting rod is inserted into the rod mounting groove, and fasteners passing through the lower connecting rod, the clamping plate, and the side mounting seat are provided to fix the lower connecting rod on the side mounting seat. S4: After installing the clamping plate on the central mounting base, align the limiting groove on the central mounting base with the insert plate at the other end of the lower connecting rod, align the rod mounting groove on the central mounting base with the end of the lower connecting rod, and fix the central mounting base on the lower connecting rod. S5: Install the lower connecting rod sequentially between the side mounting base and the side mounting base, and between the side mounting base and the center mounting base; S6: The two ends of the adapter plate are set on the lower connecting rod of the side connecting rod, the middle part of the adapter plate overlaps the lower connecting rod of the center connecting rod, and the lower connecting rod and the adapter plate are connected by fasteners. S7: Install the load-bearing seat on the side mounting seat with fasteners, so that the steel cable connected to the steel cable connecting block passes through the bending rod and then through the steel cable through hole, and the steel cable passes through the bending pulley and is fixedly connected to the load-bearing base plate by welding; S8: Tighten the fastening screw to push the displacement block and move the steel cable upward, thus tightening the steel cable; S9: Install the upper connecting rod sequentially between the side mounting base and the center mounting base; S10: Insert the first insertion plate at one end of the floor slab into the flat plate clamping groove of the central connecting rod, place the first insertion plate at the other end on the lower connecting rod of the side connecting rod, and after installing the floor slabs on both sides, insert the second insertion plate at one end of the floor slab into the flat plate clamping groove of the central connecting rod, and place the second insertion plate at the other end on the lower connecting rod of the side connecting rod. S11: Insert the upper connecting rod between the side mounting bases and fix it, then weld the first and second fixing plates to the lower connecting rod respectively; S12: Repeat S1-S11 until the target layer number is reached.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention divides the floor slab into multiple smaller parts by setting side plates and a center plate. These parts are fixed by inserting them into the flat plate clamping grooves between the upper and lower connecting rods, which facilitates the adjustment of the floor slab position. At the same time, the upper and lower connecting rods, together with the setting of fixing plate one and fixing plate two, can be fixed without aligning the studs, which reduces the difficulty of assembly and improves the stability of the floor slab connection. The setting of steel cables provides support for the central mounting base, avoiding the use of support columns and increasing the usable area of ​​the unit floor. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the unit layer of the present invention; Figure 3 This is a schematic diagram of the framework of the present invention; Figure 4 This is a bottom view of the framework of the present invention; Figure 5 This is a diagram showing the positional relationship between the upper connecting rod and the lower connecting rod of the present invention; Figure 6 This is a schematic diagram of the structure of the load-bearing seat of the present invention; Figure 7 This is a top view of the load-bearing seat of the present invention. Figure 8 This is a diagram showing the positional relationship between the central plate, the upper connecting rod, and the lower connecting rod of the present invention. Figure 9 This is a schematic diagram of the side plate of the present invention; Figure 10 This is a schematic diagram of the mechanism of the central plate of the present invention.

[0017] In the diagram: 1. Support column; 2. Side mounting seat; 201. Cylinder; 202. Base plate; 203. Limiting plate; 204. Mounting surface; 205. Cable surface; 206. Cable perforation; 207. Bearing seat; 3. Central mounting seat; 4. Side connecting rod; 401. Clamping plate; 402. Limiting groove; 403. Support plate; 404. Rod mounting groove; 405. Flat plate clamping groove; 406. Rod; 407. Insert plate; 408. Reinforcing plate; 5. Central connecting rod; 6. Side plate; 601. 602. Base plate 1; 603. Insert plate 1; 604. Overlapping clamp plate 1; 605. Overlapping clamp plate 2; 606. Floor slab 1; 607. Adaptor groove; 7. Center plate; 708. Base plate 2; 709. Insert plate 2; 7000. Overlapping clamp plate 3; 7001. Floor slab 2; 8. Adapter plate; 9. Bending pulley; 10. Bending frame; 11. Bending rod; 12. Displacement groove; 13. Steel cable connecting block; 14. Displacement block; 15. Threaded base; 16. Fastening screw; 17. Load-bearing base plate; 18. Steel cable. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1 to 10 The present invention provides a technical solution: A multi-story prefabricated steel structure frame support system includes: The unit layers are connected by support columns 1. The support column 1 at the bottom layer is fixedly connected to the foundation by means of bolts or other means.

[0020] The unit layer includes a frame set on the support column 1 and a flat layer set on the frame.

[0021] The frame includes a side mounting base 2 mounted on a support column 1, a center mounting base 3 located at the center of the side mounting base 2, a side connecting rod 4 connecting two adjacent side mounting bases 2, a center connecting rod 5 located between the center mounting base 3 and the side mounting base 2, and a load-bearing component located between the center mounting base 3 and the side mounting base 2 for supporting the center mounting base 3; both the side mounting base 2 and the center mounting base 3 include a base body, and the side mounting base 2 also includes a load-bearing seat 207 mounted on the base body. Eight side mounting bases 2 are arranged in a 3x3 grid around the center mounting base 3, and the load-bearing seats 207 are fixedly connected to the base body by means of bolts or other means.

[0022] The base includes a cylindrical body 201, a base plate 202 disposed at both ends of the cylindrical body 201, and a limiting plate 203 disposed on the base plate 202. The base plate 202 is fixedly connected to the cylindrical body 201 by welding or other means. The limiting plate 203 is disposed on the four walls of the base plate 202 and is fixedly connected to the base plate 202 by integral molding or other means. The cylindrical body 201 is alternately provided with mounting surfaces 204 and cable surfaces 205, so that the side walls of the cylindrical body 201 are octahedral. The cable surfaces 205 are provided with cable through holes 206. The limiting plate 203 and the mounting surfaces 204 are disposed opposite to each other.

[0023] Both the side connecting rod 4 and the center connecting rod 5 include a clamping plate 401 set on the cylinder 201, an upper connecting rod and a lower connecting rod inserted between the clamping plate 401 and the limiting plate 203 and arranged symmetrically. The clamping plate 401 is fixedly connected to the cylinder 201 by means of bolts, etc. A limiting groove 402 is provided between the clamping plate 401 and the limiting plate 203. A support plate 403 is provided in the middle of the clamping plate 401. The support plate 403 is fixedly connected to the clamping plate 401 by means of integral molding, etc. A rod mounting groove 404 is provided between the support plate 403 and the clamping plate 401.

[0024] A flat plate clamping groove 405 is provided between the upper connecting rod and the lower connecting rod. Both the upper connecting rod and the lower connecting rod include a rod body 406 set on the support plate 403 and inserted into the rod body mounting groove 404, an insert plate 407 set on the rod body 406 and inserted into the limiting groove 402, and a reinforcing plate 408 set on the rod body 406. The insert plate 407 is fixedly connected to the rod body 406 by means of integral molding, etc. The reinforcing plate 408 is fixedly connected to the rod body 406 by means of welding, etc. The rod body 406 is fixedly connected to the cylinder 201 by bolts that pass through the rod body 406, the clamping plate 401 and the cylinder 201 in sequence. Similarly, the insert plate 407 is fixedly connected to the cylinder 201 by bolts that pass through the limiting plate 203, the insert plate 407 and the clamping plate 401.

[0025] The load-bearing components include a transition plate 8 with both ends inserted into the flat plate clamping grooves 405 of the side connecting rods 4 and passing through the flat plate clamping grooves 405 of the central connecting rod 5; a bending pulley 9 mounted on the transition plate 8; a bending frame 10 mounted on the load-bearing seat 207; a bending rod 11 mounted on the bending frame 10; a displacement groove 12 opened on the load-bearing seat 207; a steel cable connecting block 13 mounted on the load-bearing seat 207 and passing through the displacement groove 12; a displacement block 14 mounted on the steel cable connecting block 13; a threaded base 15 mounted on the load-bearing seat 207; a fastening screw 16 passing through the displacement block 14 and inserted into the threaded base 15; a load-bearing base plate 17 mounted on the central mounting seat 3; and a steel cable 18 mounted on the load-bearing base plate 17, passing around the bending pulley 9, passing through the steel cable through hole 206, passing around the bending rod 11, and connecting to the steel cable connecting block 13. The transition plate 8 is connected to the lower connection of the side connecting rods 4 by welding or other means. The bending pulley 9 is fixedly connected to the bending machine frame 207 by means of bearings and connecting rods, and the bending frame 10 is fixedly connected to the bearing seat 207 by welding or bolts. The bending rod 11 is fixedly connected to the bending frame 10 by welding. The steel cable connecting block 13 is movably connected to the displacement groove 12. The displacement block 14 is fixedly connected to the steel cable connecting block 13 by welding. The displacement block 14 and the steel cable connecting block 13 are located on both sides of the bearing seat 207. The threaded base 15 is fixedly connected to the bearing seat 207 by welding. The fastening screw 16 is threadedly connected to the bearing seat 207 and movably connected to the displacement block 14. The bearing base plate 17 is fixedly connected to the bearing seat 207 by bolts. One end of the steel cable 18 is fixedly connected to the bearing base plate 17 by welding, and the other end of the steel cable 18 is fixedly connected to the steel cable connecting block 13 by welding.

[0026] The side plate 6 includes a base plate 601, a fixing plate 602 set on the base plate 601 and inserted into the flat plate clamping groove 405, an overlapping clamping plate 603 and an overlapping clamping plate 604 set on the base plate 601 and overlapping the upper connecting rod, and a floor plate 605 set on the base plate 601. The floor plate 605 and the base plate 601 are provided with fitting grooves 606 that match the base plate 202. The fixing plate 602 is fixedly connected to the base plate 601 by welding or other means. The overlapping clamping plate 603 is fixedly connected to the base plate 601 by welding or other means. The overlapping clamping plate 604 is fixedly connected to the base plate 601 by welding or other means. The floor plate 605 is fixedly connected to the base plate 601 by bolts or other means.

[0027] The center plate 7 includes a second base plate 701, a second insert plate 702 set on the second base plate 701 and inserted into the flat plate clamping groove 405, a third overlapping clamping plate 703 set on the second base plate 701 and erected on the upper connecting rod, and a second floor plate 704 set on the second base plate 701. The length direction of the second floor plate 704 is perpendicular to the length direction of the transition plate 8. The second insert plate 702 is fixedly connected to the second base plate 701 by welding or other means. The third overlapping clamping plate 703 is fixedly connected to the second base plate 701 by welding or other means. The second floor plate 704 is fixedly connected to the second base plate 701 by bolts or other means.

[0028] Construction method: Install the support column 1 on the foundation using fasteners; install the side mounting base 2 on the support column 1 using fasteners, and install the clamping plate 401 on the cylinder 201 of the side mounting base 2 using fasteners; install the connecting rod on the side mounting base 2 located between the two side mounting bases 2, push the lower connecting rod laterally onto the support plate 403, so that the insert plate 407 is inserted into the limiting groove 402, the lower connecting rod is inserted into the rod mounting groove 404, and fasteners passing through the lower connecting rod, clamping plate 401, and side mounting base 2 are used to fix the lower connecting rod to the side mounting base. On seat 2; after installing clamping plate 401 on center mounting seat 3, align limiting groove 402 on center mounting seat 3 with insert plate 407 at the other end of lower connecting rod, align rod mounting groove 404 on center mounting seat 3 with end of lower connecting rod, and fix center mounting seat 3 on lower connecting rod; install lower connecting rods sequentially between side mounting seats 2 and between side mounting seats 2 and center mounting seat 3; set both ends of adapter plate 8 on lower connecting rod of side connecting rod 4, and overlap the middle of adapter plate 8 on lower connecting rod of center connecting rod 5, and through Fasteners are used to connect the lower connecting rod and the adapter plate 8; the load-bearing seat 207 is installed on the side mounting seat 2 using fasteners, so that the steel cable 18 connected to the steel cable connecting block 13 passes through the bending rod 11 and then through the steel cable through hole 206, and the steel cable 18 passes through the bending pulley 9 and is fixedly connected to the load-bearing base plate 17 by welding; the fastening screw 16 is turned to push the displacement block 14 to move the steel cable 18 upward and tighten the steel cable 18; the connecting rod is installed between the side mounting seat 2 and the center mounting seat 3 in sequence; after the side plate 6 and the center plate 7 are assembled on the ground or in the factory, the floor slab is installed. Insert the fixing plate 602 at one end of the floor slab 605 into the flat plate clamping groove 405 of the central connecting rod 5, and place the fixing plate 602 at the other end on the lower connecting rod of the side connecting rod 4. After installing the floor slabs 605 on both sides, insert the fixing plate 702 at one end of the floor slab 704 into the flat plate clamping groove 405 of the central connecting rod 5, and place the fixing plate 702 at the other end on the lower connecting rod of the side connecting rod 4. Then weld the fixing plate 602 and the fixing plate 702 to the lower connecting rod respectively. Insert the upper connecting rod between the side mounting seats 2 and fix it.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-story prefabricated steel structure frame support system, characterized in that, include: Unit layers, wherein the unit layers are connected by support columns; The unit layer includes a frame disposed on the support column and a paving layer disposed on the frame; The frame includes a side mounting base disposed on the support column, a center mounting base disposed at the center of the side mounting base, a side connecting rod connecting two adjacent side mounting bases, a center connecting rod disposed between the center mounting base and the side mounting bases, and a load-bearing component disposed between the center mounting base and the side mounting bases for supporting the center mounting base; The paving layer includes a side plate with one end inserted in the side connecting rod and the other end inserted in the center connecting rod, and a center plate located between the side plates; Both the side mounting base and the center mounting base include a base body, and the side mounting base also includes a load-bearing seat disposed on the base body; The base includes a cylindrical body, base plates disposed at both ends of the cylindrical body, and a limiting plate disposed on the base plate. The cylindrical body is alternately provided with mounting surfaces and cable surfaces. Cable through holes are provided on the cable surfaces. The limiting plate and the mounting surfaces are disposed opposite to each other. Both the side connecting rod and the center connecting rod include a clamping plate disposed on the cylinder, and an upper connecting rod and a lower connecting rod inserted between the clamping plate and the limiting plate and arranged symmetrically. A limiting groove is provided between the clamping plate and the limiting plate, a support plate is provided in the middle of the clamping plate, and a rod mounting groove is provided between the support plate and the clamping plate. A flat plate clamping groove is provided between the upper connecting rod and the lower connecting rod. Both the upper connecting rod and the lower connecting rod include a rod body disposed on the support plate and inserted into the rod body mounting groove, an insert plate disposed on the rod body and inserted into the limiting groove, and a reinforcing plate disposed on the rod body.

2. The prefabricated steel structure frame support system for multi-story buildings according to claim 1, characterized in that: The load-bearing component includes a transition plate with both ends inserted into the flat plate slots of the side connecting rods and passing through the flat plate slots of the central connecting rod; a bending pulley on the transition plate; a bending frame on the load-bearing seat; a bending rod on the bending frame; a displacement slot on the load-bearing seat; a steel cable connecting block on the load-bearing seat and passing through the displacement slot; a displacement block on the steel cable connecting block; a threaded base on the load-bearing seat; a fastening screw passing through the displacement block and inserted into the threaded base; a load-bearing base plate on the central mounting seat; and a steel cable on the load-bearing base plate that passes around the bending pulley, passes through the steel cable through the steel cable hole, passes around the bending rod, and connects to the steel cable connecting block.

3. The prefabricated steel structure frame support system for multi-story buildings according to claim 2, characterized in that: The side plate includes a base plate, an insert plate 1 set on the base plate and inserted into the flat plate clamping groove, an overlapping clamping plate 1 and an overlapping clamping plate 2 set on the base plate and mounted on the upper connecting rod, and a floor plate 1 set on the base plate. The floor plate 1 and the base plate 1 are provided with fitting grooves that match the base plate.

4. The prefabricated steel structure frame support system for multi-story buildings according to claim 3, characterized in that: The center plate includes a second base plate, a second insert plate that is set on the second base plate and inserted into the slot of the flat plate, a third overlapping clamp plate that is set on the second base plate and erected on the upper connecting rod, and a second floor plate that is set on the second base plate. The length direction of the second floor plate is perpendicular to the length direction of the transition plate.

5. A construction method for a multi-story prefabricated steel structure frame support system based on claim 4, characterized in that, include: S1: Install the support column on the foundation using fasteners; S2: Install the side mounting base on the support column using fasteners, and install the clamping plate on the cylinder of the side mounting base using fasteners; S3: Install the upper connecting rod on the side mounting seat located between the two side mounting seats, push the lower connecting rod laterally onto the support plate, so that the insert plate is inserted into the limiting groove, the lower connecting rod is inserted into the rod mounting groove, and fasteners passing through the lower connecting rod, the clamping plate, and the side mounting seat are provided to fix the lower connecting rod on the side mounting seat. S4: After installing the clamping plate on the central mounting base, align the limiting groove on the central mounting base with the insert plate at the other end of the lower connecting rod, align the rod mounting groove on the central mounting base with the end of the lower connecting rod, and fix the central mounting base on the lower connecting rod. S5: Install the lower connecting rod sequentially between the side mounting base and the side mounting base, and between the side mounting base and the center mounting base; S6: The two ends of the adapter plate are set on the lower connecting rod of the side connecting rod, the middle part of the adapter plate overlaps the lower connecting rod of the center connecting rod, and the lower connecting rod and the adapter plate are connected by fasteners. S7: Install the load-bearing seat on the side mounting seat with fasteners, so that the steel cable connected to the steel cable connecting block passes through the bending rod and then through the steel cable through hole, and the steel cable passes through the bending pulley and is fixedly connected to the load-bearing base plate by welding; S8: Tighten the fastening screw to push the displacement block and move the steel cable upward, thus tightening the steel cable; S9: Install the upper connecting rod sequentially between the side mounting base and the center mounting base; S10: Insert the first insertion plate at one end of the floor slab into the flat plate clamping groove of the central connecting rod, place the first insertion plate at the other end on the lower connecting rod of the side connecting rod, and after installing the floor slabs on both sides, insert the second insertion plate at one end of the floor slab into the flat plate clamping groove of the central connecting rod, and place the second insertion plate at the other end on the lower connecting rod of the side connecting rod. S11: Insert the upper connecting rod between the side mounting bases and fix it, then weld the first and second fixing plates to the lower connecting rod respectively; S12: Repeat S1-S11 until the target layer number is reached.

Images