Construction methods for multi-layered large-span grid structures

Abstract

This invention relates to a construction method for a multi-layered, large-span grid structure, belonging to the field of steel structure technology. The method includes the following steps: Step 1: The roof construction is divided into sections. Step 2: Sections S1 and S3 of the upper roof lifting section are assembled in segments. Step 3: Sections S1 and S3 are lifted as a whole. Step 4: The hydraulic lifting system and temporary measures are dismantled, and post-installed members are installed. Step 5: Section S2 is assembled into a whole, lifted, and edge-sealing members and post-installed members are installed. Step 6: Sections Z2 and Z1 are assembled into a whole, lifted, and edge-sealing members and post-installed members are installed. Step 7: Sections X3B and X4B are assembled into a whole, lifted, and edge-sealing members and post-installed members are installed. Step 8: Except for sections X3B and X4B, which are lifted, the remaining sections of the lower roof lifting section are hoisted to complete the installation of the entire multi-layered, large-span grid structure. This method features a compact structure, high efficiency, low cost, and good operational stability.

Description

Technical Field

[0001] This invention relates to the field of steel structure technology, and specifically to a construction method for a multi-layered, large-span grid structure. Background Technology

[0002] Among the many forms of spatial structures, space frame structures have been the most widely promoted and applied both domestically and internationally over the past half-century. A space frame structure is a mesh-like spatial strut structure composed of many members arranged in two or more directions according to a certain pattern and connected by nodes.

[0003] Grid structures possess high spatial stiffness, good integrity and stability, excellent seismic performance, and appealing architectural aesthetics, making them suitable for industrial and civil buildings with various support conditions, plan shapes, and span sizes. Due to their multi-directional stress characteristics and internal force redistribution, grid structures can be used in buildings with poor foundation conditions where uneven settlement may occur.

[0004] A space frame is a grid-like, highly statically indeterminate structure composed of multiple members arranged according to a certain pattern. The members can be made of various materials, such as steel, wood, aluminum, and plastic, but steel pipes and profiles are the most common. Multi-layered overlapping grids are an effective spatial form for handling complex grid layouts, greatly facilitating the transfer of forces within the structure of buildings with complex shapes. However, this also brings significant construction challenges to such projects. Summary of the Invention

[0005] This invention primarily addresses the shortcomings of existing technologies, such as long construction periods and high costs, by providing a construction method for a multi-layered, large-span grid structure. This method features a compact structure, high efficiency, low cost, and good operational stability. It achieves a rational combination of various construction methods, improving construction efficiency, enhancing construction safety, and saving on construction costs.

[0006] The above-mentioned technical problems of the present invention are mainly solved by the following technical solutions:

[0007] A construction method for a multi-layered large-span grid structure, wherein the multi-layered large-span grid structure includes a lower grid structure, an upper grid structure is provided at the upper end of the lower grid structure, and a middle grid structure is provided between the upper grid structure and the lower grid structure.

[0008] The construction method includes the following steps:

[0009] Step 1: The roof construction is divided into sections and blocks.

[0010] The upper roof lifting zones are: S3B, S3A, S2, S1B, S1A, S1C and S3C.

[0011] The middle-level roof is divided into two zones: Z2 and Z1.

[0012] The lower roof lifting zones are: X6B, X6C, X6A, X4A, X4C, X4B, X2, X1, X3B, X3C and X3A.

[0013] Step 2: The upper roof lifting section uses the grid units of S1A, S1B, S1C and S3A, S3B and S3C to be assembled into two wholes on the assembly platform, namely S1 and S3. The assembly is carried out by laying them flat and proceeding from the middle to both sides. First, the assembly is carried out in sections, and then they are hoisted to the third floor of the upper grid structure for assembly. Assembly supports are set up during the assembly process.

[0014] Step 3: Use the hydraulic lifting system to lift the S1 and S3 areas as a whole; when the height is about 500mm away from the design elevation, stop lifting and fine-tune the height of each lifting point through the hydraulic lifting synchronization system to bring the structure height to the design position.

[0015] Step 4: Dismantle the hydraulic lifting system and temporary measures, and install the post-installation rods; complete the cumulative lifting operation in areas S1 and S3.

[0016] Step 5: Assemble the S2 area into a whole, use hydraulic lifting equipment to lift the entire unit to the design position, and install the edge sealing rods and post-installation rods.

[0017] Step 6: After the S2 area is lifted, the Z2 and Z1 areas are assembled into a whole. The entire unit is then lifted to the design position using hydraulic lifting equipment, and the edge sealing rods and post-installation rods are installed.

[0018] Step 7: After the Z2 and Z1 zones are lifted, the X3B and X4B zones are assembled into a whole. The entire unit is then lifted to the design position using hydraulic lifting equipment, and the edge sealing rods and post-installation rods are installed.

[0019] Step 8: Except for X3B and X4B, which are lifted using the lifting process, the remaining sections of the lower roof are installed using the hoisting process to complete the installation of the entire multi-layered large-span grid structure.

[0020] As a preferred method, the load is applied in stages according to the design load: 20%, 40%, 60%, 70%, 80%, 90%, 95%, and 100%, until the space frame unit in zone S1 or S3 is removed from the assembly platform. After the lowest point of zone S1A or S3A is removed from the jig by about 100mm, the lifting is paused, and the elevation of each lifting point is finely adjusted to bring it into the design position. After confirming that there are no abnormalities, the formal lifting begins.

[0021] As a preferred method, a hydraulic lifting system is used to flip and lift areas S1A, S1B, S3A, and S3B to their designed structural positions. Inserting rods are then installed between areas S1A, S1B, S3A, and S3B to connect them into a whole. Areas S1C and S3C are then assembled flat. Using the same lifting method as areas S1A, S1B, S3A, and S3B, areas S1C and S3C are gradually loaded, lifted off the ground, and left to stand still. After confirming that there are no abnormalities, the formal lifting begins.

[0022] As a preferred option, a hydraulic lifting system is used to flip and lift the S1C and S3C areas to the structural design position, and connect them with the S1A, S1B, S3A, and S3B areas to form a whole. The lifting is paused after the whole area is lifted by 1m.

[0023] As a preferred option, the lower roof is mainly assembled from ground and floor slabs, and then hoisted using a 350-ton crawler crane after being assembled into hoisting blocks. For some parts of the structure, an 80-ton truck crane is used to hoist the three-layer slabs.

[0024] Preferably, the upper, lower, and middle grid structures include an outer end truss and a large-span truss. Support columns I are provided at the junction of the outer end truss and the large-span truss, as well as at the lower rear end of the outer end truss. A temporary lifting column is provided at the upper end of the support column I. Several temporary towers are provided on the sides of the large-span truss. Hydraulic lifters are provided at the upper end of the temporary towers and at both ends of the temporary lifting columns. Steel strands are provided between the hydraulic lifters and the outer end truss, and between the hydraulic lifters and the large-span truss.

[0025] Preferably, a connecting truss is provided between the outer end truss and the large span truss. Support columns II are provided at the lower ends of both sides of the connecting truss. Temporary lifting columns are provided at the upper ends of the support columns II. Hydraulic lifting devices are provided at both ends of the temporary lifting columns. Steel strands are provided between the hydraulic lifting devices and the connecting truss.

[0026] The present invention can achieve the following effects:

[0027] This invention provides a construction method for a multi-layered, large-span grid structure, which, compared with existing technologies, features a compact structure, high efficiency, low cost, and good operational stability. It achieves a rational combination of various construction methods, improving construction efficiency, enhancing construction safety, and saving on construction costs. Attached Figure Description

[0028] Figure 1 This is a top view of the structure of the present invention.

[0029] Figure 2 This is a side view structural diagram of the present invention.

[0030] Figure 3 This is a schematic diagram of the partition structure of the present invention.

[0031] Figure 4 This is a structural schematic diagram of the lifting state I of the outer end truss and the large span truss of the present invention.

[0032] Figure 5 This is a schematic diagram of the lifting state II of the outer end truss and the large span truss of the present invention.

[0033] Figure 6 This is a schematic diagram of the lifting state (I) of the connecting truss of the present invention.

[0034] Figure 7 This is a schematic diagram of the lifting state II of the connecting truss of the present invention.

[0035] In the diagram: Upper grid structure 1, Lower grid structure 2, Middle grid structure 3, X5A zone 4, X5B zone 5, X5C zone 6, S3B zone 7, X6B zone 8, X6C zone 9, X6A zone 10, X4A zone 11, X4C zone 12, X4B zone 13, Z2 zone 14, X2 zone 15, S3A zone 16, S2 zone 17, S1B zone 18, S1A zone 19, X1 zone 20, S1C zone 21, Z1 zone 22, X3B zone 23, X3C zone 24, S3C zone 25, X3A zone 26, Steel strand 27, Hydraulic lifter 28, Temporary lifting column 29, Outer end truss 30, Temporary tower 31, Large span truss 32, Support column I 33, Connecting truss 34, Support column II 35. Detailed Implementation

[0036] The technical solution of the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0037] Example: Figure 1-7 As shown, a construction method for a multi-layered large-span grid structure is provided. The multi-layered large-span grid structure includes a lower grid structure 2, an upper grid structure 1 at the upper end of the lower grid structure 2, and a middle grid structure 3 between the upper grid structure 1 and the lower grid structure 2.

[0038] The upper grid structure 1, lower grid structure 2, and middle grid structure 3 include an outer end truss 30 and a large span truss 32. Support columns I 33 are provided at the joint between the outer end truss 30 and the large span truss 32, as well as at the lower rear end of the outer end truss 30. A temporary lifting column 29 is provided at the upper end of the support column I 33. Several temporary towers 31 are provided on the sides of the large span truss 32. Hydraulic lifters 28 are provided at the upper end of the temporary towers 31 and at both ends of the temporary lifting column 29. Steel strands 27 are provided between the hydraulic lifters 28 and the outer end truss 30, and between the hydraulic lifters 28 and the large span truss 32.

[0039] A connecting truss 34 is provided between the outer end truss 30 and the large span truss 32. Support columns II 35 are provided at the lower ends of both sides of the connecting truss 34. Temporary lifting columns 29 are provided at the upper ends of the support columns II 35. Hydraulic lifters 28 are provided at both ends of the temporary lifting columns 29. Steel strands 27 are provided between the hydraulic lifters 28 and the connecting truss 34.

[0040] The construction method includes the following steps:

[0041] Step 1: The roof construction is divided into sections and blocks;

[0042] The upper roof lifting zones are: S3B zone 7, S3A zone 16, S2 zone 17, S1B zone 18, S1A zone 19, S1C zone 21 and S3C zone 25.

[0043] The middle-level roof is divided into two zones: Zone Z2 14 and Zone Z1 22.

[0044] The lower roof lifting zones are: Zone 8 of X6B, Zone 9 of X6C, Zone 10 of X6A, Zone 11 of X4A, Zone 12 of X4C, Zone 13 of X4B, Zone 15 of X2, Zone 20 of X1, Zone 23 of X3B, Zone 24 of X3C and Zone 26 of X3A.

[0045] Step 2: The upper roof lifting section uses the space frame units of S1A zone 19, S1B zone 18, S1C zone 21 and S3A zone 16, S3B zone 7 and S3C zone 25 to be assembled into two wholes on the assembly platform, namely zone S1 and zone S3. The assembly is carried out by laying flat and proceeding from the middle to both sides. First, it is assembled in sections, and then it is hoisted to the third floor of the upper grid structure 1 for assembly. Assembly supports are set up during the assembly process.

[0046] Load the load in stages according to the design load: 20%, 40%, 60%, 70%, 80%, 90%, 95%, and 100% until the space frame unit in zone S1 or S3 is removed from the assembly platform. After the lowest point of zone S1A19 or zone S3A16 is removed from the jig by about 100mm, stop lifting, fine-tune the elevation of each lifting point to bring it to the design position, and after confirming that there are no abnormalities, start the formal lifting.

[0047] Using a hydraulic lifting system, S1A area 19, S1B area 18, S3A area 16, and S3B area 7 are flipped and lifted to the structural design position. The interlocking rods between S1A area 19, S1B area 18, S3A area 16, and S3B area 7 are installed and connected into a whole. S1C area 21 and S3C area 25 are laid flat and assembled. Using the same lifting method as S1A area 19, S1B area 18, S3A area 16, and S3B area 7, S1C area 21 and S3C area 25 are loaded, lifted off the ground, and left to stand still. After confirming that there are no abnormalities, the formal lifting begins.

[0048] Using a hydraulic lifting system, S1C zone 21 and S3C zone 25 are flipped and lifted to the structural design position, and connected with S1A zone 19, S1B zone 18, S3A zone 16, and S3B zone 7 to form a whole. The lifting is paused after the whole is lifted 1m.

[0049] Step 3: Use the hydraulic lifting system to lift the S1 and S3 areas as a whole; when the height is about 500mm away from the design elevation, stop lifting and fine-tune the height of each lifting point through the hydraulic lifting synchronization system to bring the structure height to the design position.

[0050] Step 4: Dismantle the hydraulic lifting system and temporary measures, and install the post-installation rods; complete the cumulative lifting operation in areas S1 and S3.

[0051] Step 5: Assemble S2 section 17 into a whole, use hydraulic lifting equipment to lift the entire unit to the design position, and install the edge sealing rods and post-installation rods.

[0052] Step 6: After S2 zone 17 is lifted, Z2 zone 14 and Z1 zone 22 are assembled into a whole. The entire unit is then lifted to the design position using hydraulic lifting equipment, and the edge sealing rods and post-installation rods are installed.

[0053] Step 7: After the lifting of Zone Z2 14 and Zone Z1 22 is completed, Zone X3B 23 and Zone X4B 13 are assembled into a whole. The entire unit is then lifted to the design position using hydraulic lifting equipment, and the edge sealing rods and post-installation rods are installed.

[0054] Step 8: Except for sections X3B 23 and X4B 13, which utilize a lifting process, the remaining sections of the lower roof are installed using a hoisting process, completing the installation of the entire multi-layered, large-span grid structure. The lower roof is primarily assembled from ground and floor sections, then hoisted into hoisting blocks using a 350-ton crawler crane. Some structural sections are hoisted using an 80-ton truck crane positioned on the third floor slab.

[0055] In summary, the construction method for this multi-layered, large-span grid structure features a compact structure, high efficiency, low cost, and good operational stability. It achieves a reasonable combination of various construction methods, improving construction efficiency, enhancing construction safety, and saving on construction costs.

[0056] The above description is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. A method of constructing a stacked long-span grid structure, characterized by: The stacked large-span grid structure comprises a lower layer grid structure (2), the upper end of the lower layer grid structure (2) is provided with an upper layer grid structure (1), and a middle layer grid structure (3) is arranged between the upper layer grid structure (1) and the lower layer grid structure (2); The construction method comprises the following operation steps: First step: the roof construction is processed in sections; The upper roof lifting section is S3B section (7), S3A section (16), S2 section (17), S1B section (18), S1A section (19), S1C section (21) and S3C section (25); The middle roof lifting section is Z2 section (14) and Z1 section (22); The lower roof lifting section is X6B section (8), X6C section (9), X6A section (10), X4A section (11), X4C section (12), X4B section (13), X2 section (15), X1 section (20), X3B section (23), X3C section (24) and X3A section (26); Second step: the upper roof lifting section adopts S1A section (19), S1B section (18), S1C section (21) and S3A section (16), S3B section (7), S3C section (25) grid units to be assembled on the assembling platform into two whole bodies, respectively S1 section and S3 section, the assembling is flat, the assembling is from the middle to both sides, first, the sectional assembling is adopted, then hoisted to the three floor surfaces of the upper layer grid structure (1) to be assembled, and the assembling support is arranged in the assembling process; According to the design load, the loading is sequentially graded at 20%, 40%, 60%, 70%, 80%, 90%, 95% and 100% until the grid unit of S1 section or S3 section is separated from the assembling platform; after the lowest point of S1A section (19) or S3A section (16) is separated from the jig by 100 mm, the lifting is paused, the elevations of all lifting points are slightly adjusted, the structure is in the design posture, after confirming that there is no abnormal situation, the formal lifting is started; The S1A section (19), S1B section (18) and S3A section (16), S3B section (7) are turned and lifted to the structure design posture by using the hydraulic lifting system, the embedded rods between S1A section (19), S1B section (18) and S3A section (16), S3B section (7) are installed, the whole body is connected, S1C section (21), S3C section (25) are flat assembled, and the lifting method of S1A section (19), S1B section (18) and S3A section (16), S3B section (7) is adopted to sequentially load, separate from the ground, stand still, confirm that there is no abnormal situation, and then start the formal lifting; The S1C section (21), S3C section (25) are turned and lifted to the structure design posture by using the hydraulic lifting system, and are connected with S1A section (19), S1B section (18) and S3A section (16), S3B section (7) to form a whole body, the whole body is lifted by 1 m, and then the lifting is paused; Third step: the S1 section and the S3 section are lifted as a whole by using the hydraulic lifting system; when the lifting is to 500 mm from the design elevation, the lifting is paused, the elevations of all lifting points are slightly adjusted through the hydraulic lifting synchronous system, and the structure height is to the design position. Fourth step: remove the hydraulic lifting system and temporary measures, install the rear loading member; complete the cumulative lifting operation of S1 area and S3 area; Fifth step: assemble S2 area (17) into a whole, use the hydraulic lifting equipment to lift the whole unit to the designed position, install the edge sealing member and the rear loading member; Sixth step: after the completion of the lifting of S2 area (17), assemble Z2 area (14) and Z1 area (22) into a whole, use the hydraulic lifting equipment to lift the whole unit to the designed position, install the edge sealing member and the rear loading member; Seventh step: after the completion of the lifting of Z2 area (14) and Z1 area (22), assemble X3B area (23) and X4B area (13) into a whole, use the hydraulic lifting equipment to lift the whole unit to the designed position, install the edge sealing member and the rear loading member; Eighth step: the lower roof lifting subarea adopts the lifting process except X3B area (23) and X4B area (13), the rest blocks adopt the hoisting process, and the installation of the whole laminated large-span grid structure is completed.

2. The construction method of a stacked long-span grid structure according to claim 1, characterized in that: The lower roof mainly adopts ground and floor assembly, and after the assembly into hoisting blocks, the 350-ton crawler crane is used for hoisting, and the local structure is hoisted by the 80-ton truck crane standing on the three-layer plate.

3. The construction method of a stacked long-span grid structure according to claim 1, characterized in that: The upper grid structure (1), the lower grid structure (2) and the middle grid structure (3) comprise outer end trusses (30) and large-span trusses (32), the outer end trusses (30) and the large-span trusses (32) are provided with support columns I (33) at the abutment and the lower rear part of the outer end trusses (30), the support columns I (33) are provided with temporary lifting column frames (29) at the upper ends, the large-span trusses (32) are provided with a plurality of temporary towers (31) at the sides, the temporary towers (31) and the temporary lifting column frames (29) are provided with hydraulic lifters (28) at the upper ends and the two ends, and the hydraulic lifters (28) are provided with steel strands (27) between the outer end trusses (30) and the large-span trusses (32).

4. The construction method of a stacked long-span grid structure according to claim 3, characterized in that: The outer end trusses (30) and the large-span trusses (32) are provided with connecting trusses (34) between them, the connecting trusses (34) are provided with support columns II (35) at the lower ends of the two sides, the support columns II (35) are provided with temporary lifting column frames (29) at the upper ends, the temporary lifting column frames (29) are provided with hydraulic lifters (28) at the two ends, and the hydraulic lifters (28) are provided with steel strands (27) between the connecting trusses (34).

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