A method for manufacturing and assembling a steel structure net shell hoisting unit on the ground

Abstract

The application discloses a steel structure net shell hoisting unit manufacturing and ground assembling method, which comprises the following steps: constructing a roof net model, including a support jig and a roof cover; obtaining floor coordinate points corresponding to the support jig and roof cover coordinate points in the roof net model according to the roof net model, and performing initial floor marking and initial roof cover marking; obtaining horizontal values of the hoisting unit according to the floor coordinate points and the roof cover coordinate points; obtaining floor installation marking and roof cover installation marking corresponding to the initial floor marking and the initial roof cover marking according to the horizontal values of the hoisting unit; and performing installation construction according to the corresponding floor installation marking and roof cover installation marking. The method can reduce the overall assembling difficulty and welding difficulty, save labor, save the support jig material input amount, reduce the risk coefficient and eliminate the safety hidden danger.

Description

Technical Field

[0001] This application relates to the field of building construction technology, and in particular to a method for fabricating and assembling a steel structure grid shell hoisting unit on the ground. Background Technology

[0002] When there is a large vertical height difference between the members in the same hoisting unit during the assembly of a steel roof mesh shell, if the hoisting unit is assembled on the ground in the same state as when it was completed in the air, the height of the support frame at the bottom of the hoisting unit will be inconsistent. If the height difference of the support frame is too large, it will increase the safety risk of overturning, greatly increase the risk factor, and increase the amount of support frame material required. In addition, the assembly site is limited and cannot be guaranteed to be at the same elevation, and there are height differences on the ground. Summary of the Invention

[0003] This specification provides a method for fabricating and assembling a steel structure grid shell hoisting unit on the ground, which solves the problem in the prior art where large height differences during ground installation can easily cause overturning.

[0004] The technical solutions provided in the embodiments of this specification are as follows:

[0005] This application provides a method for fabricating and assembling a steel structure grid shell hoisting unit on the ground, the method including:

[0006] Construct a roof mesh model, including the supporting frame and the roof;

[0007] Based on the roof mesh model, obtain the landing coordinates and roof coordinates corresponding to the supporting frame in the roof mesh model, and assign initial landing coordinates and initial roof coordinates.

[0008] The horizontal values ​​of the hoisting unit are obtained based on the landing coordinates and the roof coordinates.

[0009] Based on the horizontal values ​​of the hoisting unit, obtain the initial landing mark number and the initial roof mark number, and obtain the corresponding landing installation mark number and roof installation mark number.

[0010] Installation shall be carried out according to the corresponding ground installation number and roof installation number.

[0011] Furthermore, based on the landing coordinates and the steel roof coordinates, the horizontal value of the hoisting unit is obtained by using the height coordinates of the landing coordinates and the steel roof coordinates, and calculating the horizontal value of the hoisting unit according to the average value calculation formula.

[0012] Furthermore, based on the horizontal values ​​of the hoisting unit, the corresponding landing installation number and roof installation number are obtained by: averaging the height coordinate values ​​of the landing coordinate point and the steel roof coordinate point to be close to or equal to the horizontal value, thereby obtaining the landing installation number and roof installation number.

[0013] Furthermore, based on the corresponding ground installation number and roof installation number, the installation work includes: placing the support frame with the larger height coordinate value at the location with the smaller site height coordinate value, and placing the support frame with the smaller height coordinate value at the location with the larger site height coordinate value.

[0014] Furthermore, the method also includes: selecting the optimal point to divide the roof into blocks, where the optimal point refers to the point closest to the horizontal value; using the optimal point as a control point, and using the control point as a base point to measure, lay out, and assemble the blocks, and the assembled blocks are the correct blocks derived from the detailed design.

[0015] Furthermore, after the blocks are completed, the node components and support rods are processed as a whole and then shipped out of the processing plant. The node components are individual components, and the support rods are single rods. The block unit rods are transported to the ground in sections, assembled, and then hoisted into blocks.

[0016] Furthermore, the installation work includes assembling the roof on the ground, using height-adjustable support frames as temporary supports during the assembly process.

[0017] Furthermore, the steel structure adopts box-type steel beams.

[0018] Furthermore, the wall thickness of the box girder is increased at locations where the axial stress on the steel structure is greater.

[0019] The above-mentioned at least one technical solution adopted in the embodiments of this application can achieve the following beneficial effects: it can absorb the height difference within the hoisting unit, and we can flip or rotate the assembly site so that the longer support frame is placed at the lower elevation of the site, and the shorter support frame is placed at the higher elevation of the site. At the same time, all support frames can be lowered by one value at the same time, so that the relative height difference between the support frames remains unchanged, balancing the overall level of the hoisting unit. The advantages are that it reduces the overall assembly and welding difficulty, saves labor, saves the amount of support frame material input, reduces the risk factor and eliminates safety hazards. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0021] Figure 1 This is a schematic diagram of the method flow provided in the embodiments of this specification. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0024] This specification provides an embodiment of a method for fabricating and assembling a steel structure grid shell hoisting unit on the ground. Please refer to [link / reference]. Figure 1 As shown, the method includes:

[0025] S1. Construct a roof mesh model, including the supporting frame and the roof;

[0026] In one possible implementation, three-dimensional simulation technology is used to create a roof mesh model, which is composed of multiple individual rods assembled together.

[0027] S2. Based on the roof mesh model, obtain the landing coordinates and roof coordinates corresponding to the supporting frame in the roof mesh model, and assign initial landing coordinates and initial roof coordinates.

[0028] In one possible implementation, based on the roof mesh model, the three-dimensional coordinate system of the ends of each member of the hoisting unit in the air is obtained, and the three-dimensional coordinates of the ground assembly site are simultaneously transformed and derived. The landing coordinate points and roof coordinate points corresponding to the support frame in the roof mesh model are obtained, and the initial landing mark and initial roof mark are made.

[0029] S3. Obtain the horizontal values ​​of the hoisting unit based on the landing coordinates and the roof coordinates;

[0030] In one possible implementation, obtaining the horizontal value of the hoisting unit based on the landing coordinates and the steel roof coordinates includes: using the height coordinates of the landing coordinates and the steel roof coordinates, and calculating the horizontal value of the hoisting unit according to the average value calculation formula.

[0031] S4. Based on the horizontal values ​​of the hoisting unit, obtain the initial landing mark and the initial roof mark, and the corresponding landing installation mark and roof installation mark.

[0032] In one possible implementation, obtaining the initial landing mark and the corresponding landing installation mark and roof installation mark based on the horizontal value of the hoisting unit includes: averaging the height coordinate values ​​of the landing coordinate point and the steel roof coordinate point to be close to or equal to the horizontal value, thereby obtaining the landing installation mark and the roof installation mark.

[0033] S5. Install according to the corresponding floor installation number and roof installation number.

[0034] In one possible implementation, based on the corresponding ground installation number and roof installation number, the installation work includes: placing the support frame with the larger height coordinate value at the location with the smaller site height coordinate value, and placing the support frame with the smaller height coordinate value at the location with the larger site height coordinate value.

[0035] This embodiment can accommodate height differences within the hoisting unit and allows for flipping or rotating the assembly site. Longer support frames are positioned at lower elevations, while shorter ones are positioned at higher elevations. Simultaneously, all support frames can be lowered by a certain value, maintaining the relative height difference between them and balancing the overall level of the hoisting unit. The advantages include reduced assembly and welding difficulty, labor savings, reduced material input for support frames, lower risk factors, and elimination of safety hazards.

[0036] In a preferred embodiment, the method further includes: selecting the optimal point to divide the roof into blocks, where the optimal point is the point closest to the horizontal value; using the optimal point as a control point, and using the control point as a base point to measure, lay out, and assemble the blocks; the assembled blocks are the correct blocks derived from the detailed design. After the blocks are divided, the node components and support rods are processed as a single unit and then shipped from the processing plant; the node components are individual components, and the support rods are single rods; the block unit rods are transported to the site in sections, assembled, and then hoisted into blocks. For example, using 3D simulation technology, a roof grid shell model is established. Based on the grid shell surface slope and the characteristics of construction machinery, the point with the least deformation is selected to divide the roof into blocks. The correct detailed model is rotated in CAD to the angle desired for on-site assembly. Then, a reference point is selected to establish a coordinate system, and the coordinates of the control points are read. During actual assembly, a point is used as the reference point in the CAD, and that point is used as the control point to measure the coordinates of the control points of the laid-out and assembled blocks for assembly; the assembled blocks are the correct blocks derived from the detailed design. The segmented reticulated shell model is rotated and leveled to reduce the difficulty of ground assembly. Simultaneously, ground assembly support frames and roof installation support frames are designed based on the height differences of various points on the roof before and after leveling. Furthermore, using the three-dimensional coordinate system at the ends of each member of the hoisting unit in the air, the three-dimensional coordinates of the ground assembly site are simultaneously derived. Each segment is a whole; regardless of movement, it remains the same segment. During ground assembly, only one coordinate system needs to be established at a single point. Sufficient control points are set on this segment to verify its accuracy and ensure it can be assembled as a whole. Although the coordinates of the control points may change depending on how a complete steel body rotates within a coordinate system, the relative relationships between the control points remain unchanged. At this point, we can combine the ground coordinate system of this hoisting unit with the characteristics of its assembly site. By utilizing the existing elevation differences in the site, we can simultaneously address the elevation differences within the hoisting unit. We can also rotate or flip the hoisting unit at the assembly site, placing the longer support frames at the lower elevation points and the shorter support frames at the higher elevation points. Simultaneously, we can lower all the support frames by one value, thus maintaining the relative elevation difference between the support frames and balancing the overall horizontal value of the hoisting unit. The advantages are reduced overall assembly and welding difficulty, labor savings, reduced support frame material input, reduced risk factor, and elimination of safety hazards.

[0037] In a preferred embodiment, the installation work includes assembling the roof on the ground, using height-adjustable support frames as temporary supports during the assembly process.

[0038] In a preferred embodiment, the steel structure employs box-section steel beams. The wall thickness of the box-section steel beams is increased at locations where the axial stress on the steel structure is significant. For example, conventional components typically use a U-shaped structure. In this embodiment, a steel structure model was established using Rhino and Tekla steel structure modeling software. Tekla was used to refine the drawings, and the cross-section was optimized using the large-scale general-purpose finite element analysis software Abaqus. The U-shaped cross-section was completely replaced with a box-section, and the internal horizontal continuous stiffening plate was eliminated, reducing the overall weight. Simultaneously, the height of the roof grid shell components was changed to an intersecting form of main and secondary beams in three sizes: 900mm, 700mm, and 500mm. Only the wall thickness of the box-section steel beams at some stress-bearing locations needs to be increased from the original design to meet axial stress and structural requirements. The total weight of the roof grid shell is significantly reduced, and conditions are provided for the PTFE membrane structure on the roof grid shell to achieve proper form and slope, and for natural drainage.

[0039] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0040] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for fabricating and assembling a steel structure grid shell hoisting unit on the ground, characterized in that, Construct a roof mesh model that includes a support frame and a roof. Based on the roof mesh model, obtain the landing coordinates of the support frame and the roof coordinates in the roof mesh model, and assign initial landing coordinates and initial roof coordinates. The horizontal value of the hoisting unit is obtained by using the height coordinates of the landing coordinates and the roof coordinates, according to the average value calculation formula. By averaging the height coordinates of the landing coordinate point and the roof coordinate point to be close to or equal to the horizontal value, the landing installation number and the roof installation number corresponding to the initial landing number and the initial roof number are obtained. According to the corresponding ground installation number and roof installation number, the installation construction is carried out by placing the support frame with the larger height coordinate value at the location with the smaller site height coordinate value, and the support frame with the smaller height coordinate value at the location with the larger site height coordinate value.

2. The method for fabricating and assembling a steel structure grid shell hoisting unit on the ground according to claim 1, characterized in that, The method also includes: selecting the optimal point to divide the roof into blocks, where the optimal point is the point closest to the horizontal value; using the optimal point as a control point and the control point as a base point to measure, lay out, and assemble the blocks, and the assembled blocks are the correct blocks obtained from the detailed design.

3. The method for fabricating and assembling a steel structure grid shell hoisting unit on the ground according to claim 2, characterized in that, After the blocks are completed, the node components and support rods are processed as a whole and then shipped out of the processing plant. The node components are individual components, and the support rods are single rods. The block unit rods are transported to the ground in sections, assembled, and then hoisted into blocks.

4. The method for fabricating and assembling a steel structure grid shell hoisting unit on the ground according to claim 1, characterized in that, The installation work includes assembling the roof on the ground, using height-adjustable support frames as temporary supports during the assembly process.

5. The method for fabricating and assembling a steel structure grid shell hoisting unit on the ground according to claim 1, characterized in that, The steel structure uses box-type steel beams.

6. The method for fabricating and assembling a steel structure grid shell hoisting unit on the ground according to claim 1, characterized in that, Increase the wall thickness of the box girder at locations where the axial stress of the steel structure is greater.

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