Swivel assembling method of multi-layer net rack unit

Abstract

The present application relates to a kind of multi-layer net rack unit's swivel assembly method, the technical field of net rack steel structure construction, and multi-layer net rack unit includes several day-shaped net rack unit connection, two adjacent day-shaped net rack unit is connected by connecting supplementary pole and inclined brace supplementary pole and forms multi-layer net rack unit, the day-shaped net rack unit includes a pair of side net rack, and several middle chord are provided between two side net racks.The side net rack includes by vertical chord and transverse chord and is assembled into "Tian" shape structure, the vertical chord is equipped with node layer ball between transverse chord, and the side net rack is equipped with inclined web member with node layer ball and is integrally welded.The advantages of time saving, labor saving, convenient operation and good running stability.Effectively reduce the amount of high-altitude operation, improve installation precision, ensure welding quality, shorten installation period, save installation measures, reduce construction cost, improve construction efficiency.

Description

Technical Field

[0001] This invention relates to the field of space frame steel structure construction technology, specifically to a method for rotating and assembling multi-layer space frame units. Background Technology

[0002] Space frame structures are currently widely used in public buildings such as stadiums, exhibition halls, and waiting rooms. In recent years, multi-layer space frames have also been increasingly used in buildings with super-large spans such as warehouses, aircraft hangars, and factories.

[0003] Taking a three-layer space frame as an example, it is mainly composed of three layers: the upper chord, the middle chord, and the lower chord. The frame is often quite tall, which means that the assembly of the middle chord and the upper chord on the ground is a high-altitude operation, making construction difficult and requiring high-level hoisting equipment and technical personnel.

[0004] The conventional method for assembling a three-layer space frame on the ground is as follows: Divide the structure into small units according to the design drawings. First, install the lower chord sphere of each unit and connect it to the lower chord members. Then, install the lower-layer vertical and diagonal web members in sequence. Next, install the middle chord sphere and middle chord members. Then, install the upper-layer vertical and diagonal web members in sequence. Finally, install the upper chord sphere and upper chord members to complete the assembly of the small units. After assembling multiple basic units, add additional members between the units to form the entire space frame.

[0005] Because the three-layer, two-way orthogonal welded spherical grid structure has many members and a high frame, conventional assembly methods involve high-altitude work for the upper and middle chord members. In particular, the working height of the upper chord layer is often over 10 meters, which is not conducive to the positioning and construction of the members, makes it difficult to guarantee the welding quality, and requires the construction of a large number of operating platforms, making the construction extremely difficult and the construction period hard to guarantee. Summary of the Invention

[0006] This invention primarily addresses the shortcomings of existing technologies by providing a method for rotating and assembling multi-layer space frame units. This method offers advantages such as time and labor savings, ease of operation, and high operational stability. It effectively reduces high-altitude work, improves installation accuracy, ensures welding quality, shortens the installation period, saves on installation measures, lowers construction costs, and increases construction efficiency.

[0007] The above-mentioned technical problems of the present invention are mainly solved by the following technical solutions:

[0008] A method for rotating and assembling a multi-layer space frame unit, wherein the multi-layer space frame unit comprises several H-shaped space frame units connected together, and two adjacent H-shaped space frame units are connected by connecting rods and diagonal bracing rods to form a multi-layer space frame unit. The H-shaped space frame unit includes a pair of side space frames, and several middle chord rods are provided between the two side space frames.

[0009] The described side grid structure includes a "field" - shaped structure assembled by vertical chord bars and horizontal chord bars. Node - layer balls are provided between the vertical chord bars and the horizontal chord bars, and diagonal web members integrally welded with the node - layer balls are provided inside the side grid structure.

[0010] The method for assembling and rotating multiple - layer grid units includes the following operating steps:

[0011] The first step: When assembling on the ground, divide the overall three - layer grid into multiple "day" - shaped grid units to determine the assembling units.

[0012] The second step: Use a total - station device to place the assembling support frame at the bottom according to the coordinates of the "day" - shaped grid unit for lofting.

[0013] The third step: Place the node - layer balls on the assembling support frame, and then complete the welding of the vertical chord bars, horizontal chord bars, and diagonal web members between the node - layer balls to assemble the side grid structure into shape.

[0014] The fourth step: Then weld the middle chord bars between two side grid structures placed parallel to each other vertically to complete the assembling and welding operation of the "day" - shaped grid unit.

[0015] The fifth step: Flip the "day" - shaped grid unit placed horizontally on the assembling support frame.

[0016] The sixth step: Weld and fix adjacent "day" - shaped grid units through connecting supplementary bars and diagonal bracing supplementary bars to form an integral multi - layer grid unit, and complete the ground assembling operation of the entire three - layer grid.

[0017] Preferably, for the overall layout of the grid and the lifting capacity of the lifting equipment, divide the multi - layer grid unit into multiple assembling units according to the "day" - shaped pattern, determine the overall assembling sequence, and use CAD software to determine the assembling coordinates after the "day" - shaped grid unit is laid flat.

[0018] Preferably, the assembling support frame has adjustable supports, and the height is controlled at a position where the center of the node - layer ball is 0.8 m from the ground.

[0019] Preferably, during the assembly of the "day" - shaped grid unit, first carry out spot welding, and conduct small - unit measurement before formal welding to control the errors generated during assembly.

[0020] Preferably, use a total - station to conduct positioning and review of the coordinates of the welded node - layer balls of the "day" - shaped grid unit and the coordinates of the assembled model after being laid flat. Use a level, a theodolite, and a steel tape to measure the overall outer - contour geometric dimensions, the detailed height differences, the perpendicularity and horizontality of the bars, and the clearance between the balls and the bars of the small unit. After finding and adjusting the deviations to be in place, then conduct full - scale welding, and require that each frame is qualified and the whole is qualified.

[0021] As a preferred method, the inversion and erection of the H-shaped space frame unit is achieved by using a truck crane or tower crane. The positioning of the formed H-shaped space frame unit is then re-measured, and the spherical coordinates of the node layer of the inverted H-shaped space frame unit are re-measured using a total station. At the same time, the outer contour dimensions and deflection of the inverted small unit are measured.

[0022] As a preferred option, when deviations exist, if the deviation value is small, mark it and then correct the overall size of the space frame by adjusting the length of the supplementary rods between small units and the gap between the clubs; if the deviation value exceeds the allowable range, the cause of the deviation needs to be found and reworked, and the same part should not be reworked more than twice.

[0023] The supplementary members are connecting supplementary members and diagonal bracing supplementary members; the ball-shaped members are the members connected by balls at the node layer, including the middle chord, vertical chord, horizontal chord, and diagonal web members.

[0024] The present invention can achieve the following effects:

[0025] This invention provides a method for rotating and assembling multi-layer space frame units. Compared with existing technologies, it has the advantages of saving time and labor, convenient operation, and good operational stability. It effectively reduces the amount of work at height, improves installation accuracy, ensures welding quality, shortens the installation period, saves on installation measures, reduces construction costs, and improves construction efficiency. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention.

[0027] Figure 2 This is a schematic diagram of the structure of the multi-layer space frame unit of the present invention.

[0028] Figure 3 This is a schematic diagram of the structure of the H-shaped space frame unit of the present invention.

[0029] Figure 4 This is a schematic diagram of the side frame steel structure of the present invention.

[0030] Figure 5 This is a schematic diagram of the assembly frame placement structure of the present invention.

[0031] In the diagram: 1. H-shaped space frame unit, 2. Connecting support rod, 3. Diagonal bracing support rod, 4. Assembly frame, 5. Side space frame, 6. Middle chord, 7. Vertical chord, 8. Node layer ball, 9. Horizontal chord, 10. Diagonal web member. Detailed Implementation

[0032] The technical solution of the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0033] Example: Figure 1-5As shown in the figure, a method for rotating and assembling a multi-layer grid unit, the multi-layer grid unit is composed of several "day-shaped" grid units 1 connected together. Two adjacent "day-shaped" grid units 1 form a multi-layer grid unit through connecting supplementary rods 2 and diagonal bracing supplementary rods 3. The "day-shaped" grid unit 1 includes a pair of side grids 5, and several middle chord rods 6 are arranged between the two side grids 5.

[0034] The side grid 5 includes a "field-shaped" structure assembled by vertical chord rods 7 and horizontal chord rods 9. Node layer balls 8 are arranged between the vertical chord rods 7 and the horizontal chord rods 9. Diagonal web members 10 integrally welded with the node layer balls 8 are arranged inside the side grid 5.

[0035] The method for rotating and assembling a multi-layer grid unit includes the following operating steps:

[0036] The first step: During ground assembly, the overall three-layer grid is divided into multiple "day-shaped" grid units 1 to determine the assembly units. For the overall layout of the grid and the lifting capacity of the lifting equipment, the multi-layer grid unit is divided into multiple assembly units according to the day shape to determine the overall assembly sequence, and the CAD software is used to determine the assembly coordinates of each "day-shaped" grid unit 1 after being laid flat.

[0037] The second step: Using a total station equipment, place the assembly jig 4 at the bottom layer according to the coordinates of the "day-shaped" grid unit 1 for lofting. The assembly jig 4 has adjustable supports, and the height is controlled at a position 0.8 m from the ground to the center of the node layer ball 8.

[0038] The third step: Place the node layer balls 8 on the assembly jig 4, and then complete the welding of the vertical chord rods 7, horizontal chord rods 9 and diagonal web members 10 between the node layer balls 8 to assemble and form the side grid 5.

[0039] The fourth step: Then weld the middle chord rods 6 between two side grids 5 placed parallel up and down to complete the assembly and welding operation of the "day-shaped" grid unit 1. When assembling the "day-shaped" grid unit 1, spot welding is carried out first, and small unit measurement is carried out before formal welding to control the errors generated during assembly. Use a total station to locate and review the coordinates of the node layer balls 8 of the "day-shaped" grid unit 1 and the coordinates of the assembly model after being laid flat, and use equipment such as a level, a theodolite, and a steel tape to measure the overall outer contour geometric dimensions, the detailed height, the perpendicularity of the rods and the horizontal degree, and the clearance between the balls and rods of the small unit. After finding and adjusting the deviations in place, then carry out full welding.

[0040] Step 5: Flip over the H-shaped space frame unit 1, which is placed horizontally on the assembly jig 4. Flipping and erecting the H-shaped space frame unit 1 is achieved using a truck crane and tower crane, and the finalized H-shaped space frame unit 1 is repositioned and remeasured. The coordinates of the node layer sphere 8 of the flipped H-shaped space frame unit 1 are remeasured using a total station, and the outer contour dimensions and deflection of the flipped small units are measured. If deviations exist, and the deviation values ​​are small, they are marked, and the overall dimensions of the space frame are corrected by adjusting the length of the supplementary members between small units and the gaps between the spheres and spheres. If the deviation values ​​exceed the allowable range, the cause of the deviation must be identified and reworked; the same part should not be reworked more than twice.

[0041] Step 6: Adjacent H-shaped space frame units 1 are welded and fixed together with connecting rods 2 and diagonal bracing rods 3 to form an integral multi-layer space frame unit, completing the ground assembly of the entire three-layer space frame.

[0042] In summary, this multi-layer space frame unit rotation assembly method has the advantages of saving time and labor, convenient operation, and good operational stability. It effectively reduces the amount of high-altitude work, improves installation accuracy, ensures welding quality, shortens the installation period, saves on installation measures, reduces construction costs, and improves construction efficiency.

[0043] 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 for rotating and assembling a multi-layer space frame unit, characterized in that: The multi-layer grid unit is composed of a number of "day"-shaped grid units (1) connected together. Two adjacent "day"-shaped grid units (1) form a multi-layer grid unit through connecting supplementary bars (2) and diagonal bracing supplementary bars (3). The "day"-shaped grid unit (1) includes a pair of side grids (5), and a number of middle chord bars (6) are arranged between the two side grids (5). The side grid (5) includes a structure assembled into a "field" shape by vertical chord bars (7) and horizontal chord bars (9). Node layer balls (8) are arranged between the vertical chord bars (7) and the horizontal chord bars (9). Diagonal web bars (10) integrally welded with the node layer balls (8) are arranged inside the side grid (5). The method for rotating and assembling the multi-layer grid unit includes the following operating steps: The first step: When assembling on the ground, divide the overall three-layer grid into multiple "day"-shaped grid units (1) to determine the assembling units. The second step: Use total station equipment to place the assembling jig (4) at the bottom according to the coordinates of the "day"-shaped grid unit (1) for lofting. The third step: Place the node layer balls (8) on the assembling jig (4), and then complete the welding of the vertical chord bars (7), horizontal chord bars (9) and diagonal web bars (10) between the node layer balls (8) to assemble the side grid (5) into shape. The fourth step: Then weld the middle chord bars (6) between the two side grids (5) placed parallel up and down to complete the assembling and welding operation of the "day"-shaped grid unit (1). The fifth step: Flip the "day"-shaped grid unit (1) placed horizontally on the assembling jig (4). The sixth step: Weld and fix adjacent "day"-shaped grid units (1) through connecting supplementary bars (2) and diagonal bracing supplementary bars (3) to form an overall multi-layer grid unit, and complete the ground assembling operation of the entire three-layer grid.

2. The method for rotating and assembling a multi-layer space frame unit according to claim 1, characterized in that: For the overall layout of the grid and the lifting weight of the lifting equipment, divide the multi-layer grid unit into multiple assembling units according to the "day" shape, determine the overall assembling sequence, and use CAD software to determine the assembling coordinates after the "day"-shaped grid unit (1) is laid flat.

3. The method for rotating and assembling a multi-layer space frame unit according to claim 1, characterized in that: The assembling jig (4) has an adjustable support, and the height is controlled at the position where the center of the node layer ball (8) is 0.8 m from the ground.

4. The method for rotating and assembling a multi-layer space frame unit according to claim 1, characterized in that: When assembling the "day"-shaped grid unit (1), first carry out spot welding, and perform small unit measurement before formal welding to control the errors generated during assembling.

5. The method for rotating and assembling a multi-layer space frame unit according to claim 4, characterized in that: Use a total station to perform positioning and verification on the coordinates of the node layer balls (8) of the "day"-shaped grid unit (1) and the coordinates of the assembled model after being laid flat. Use a level, a theodolite and a steel tape to measure the overall outer contour geometric dimensions, the detailed height differences, the perpendicularity and horizontality of the bars, and the clearances between the balls and the bars of the small unit. After finding and adjusting the deviations to be in place, then carry out full welding.

6. The method for rotating and assembling a multi-layer space frame unit according to claim 1, characterized in that: The "day"-shaped grid unit (1) is flipped and erected by a truck crane and a tower crane, and positioning and re-measurement are carried out on the formed "day"-shaped grid unit (1). Use a total station to re-measure the coordinates of the node layer balls (8) of the flipped "day"-shaped grid unit (1), and at the same time measure the outer contour dimensions and deflections of the flipped small unit.

7. The method for rotating and assembling a multi-layer space frame unit according to claim 6, characterized in that: When deviations exist, if the deviation is small, mark it and then correct the overall size of the space frame by adjusting the length of the supplementary rods between small units and the gap between the clubs; if the deviation exceeds the allowable range, the cause of the deviation must be found and reworked. The same part should not be reworked more than twice.

Images