Pre-arching construction method for step-shaped grid structure

Abstract

The invention discloses a pre-arching construction method for a step-shaped grid structure, which comprises the following steps of: establishing an annular gradient deformation prediction model, and predicting a deflection deformation rule of each step of grid structure in the step-shaped grid structure in an accumulative lifting process by utilizing the model according to information data of the grid structure; for each order of the net rack, selecting a deformation point with the maximum deflection on the order of the net rack as an annular gradient divergence center, performing annular gradient division on the order of the net rack, and obtaining an arching value corresponding to each annular gradient; integrating the assembling node data of each order of the net rack according to the result of the annular gradient division on each order of the net rack, and carrying out data superposition processing by referring to the arching value of the annular gradient where each assembling node is located so as to obtain pre-arching assembling data of each assembling node; and according to the pre-arching splicing data, splicing each step of the net rack. According to the method, the installation precision of the step-shaped grid structure is effectively improved, the follow-up adjustment workload is reduced, and the safety and stability of the structure are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a pre-arching construction method for a stepped grid structure. Background Art

[0002] In the construction of multi-level stepped grid structures, as the grids of each level are lifted layer by layer, due to factors such as the deadweight of the structure and changes in construction loads, the grids often produce complex deformations during the lifting process, especially the annular gradient deformation around the mid-span support points of the staggered spans. Traditional construction methods often ignore the impact of this deformation and directly perform overall arching according to the deflection size, resulting in a large number of adjustments required after the grid is installed, which not only increases the difficulty and cost of construction, but may also affect the structural performance. Summary of the invention

[0003] In view of the above problems, the present invention discloses a pre-arching construction method of a stepped grid structure, wherein the stepped grid comprises a multi-step grid; wherein the method comprises the following steps:

[0004] Step S1, establishing an annular gradient deformation prediction model applicable to a stepped grid structure, and using the annular gradient deformation prediction model to predict the deflection deformation law of each step of the stepped grid structure during the cumulative lifting process according to the information data of the stepped grid structure;

[0005] Step S2, for each grid, select the deformation point with the largest deflection on the grid as the annular gradient divergence center of the grid, and divide the grid into annular gradients with the set deflection change value of the grid as the gradient interval, and obtain the arch value corresponding to each annular gradient according to the simulation analysis deformation value corresponding to each annular gradient;

[0006] Step S3, integrating the assembly node data of each order of grid frames according to the results of the annular gradient division on each order of grid frames, and performing data superposition processing with reference to the arch value of the annular gradient where each assembly node is located to obtain the pre-arch assembly data of each assembly node;

[0007] Step S4, assembling each step of the grid according to the pre-arched assembly data to form the stepped grid structure.

[0008] In some of the embodiments, a ring-shaped gradient deformation prediction model applicable to a stepped grid structure is established by finite element analysis.

[0009] In some of the embodiments, the information data of the stepped grid structure includes the material, structural parameters, load conditions and environmental conditions of the stepped grid structure.

[0010] In some of the embodiments, the arch value of the deformation point with the largest deflection on the stepped grid structure is set to 70% to 80% of the simulated analysis deformation value of the deformation point with the largest deflection.

[0011] In some of the embodiments, the arching value corresponding to each annular gradient is set at 70% to 80% of the simulation analysis deformation value corresponding to the annular gradient.

[0012] In some of the embodiments, in step S4, for each level of the grid, the deformation point with the largest deflection on the level of the grid is used as the starting position for assembly, and a review is performed every 2 to 3 grids during the assembly process, and after confirming that it meets the design specification requirements, the assembly continues to expand outward.

[0013] In some embodiments, the construction method further comprises:

[0014] Step S5, cumulatively expanding and lifting the stepped grid structure from high to low in stages, and implementing deformation monitoring during the lifting process, and verifying the accuracy of the annular gradient deformation prediction model through real-time feedback of deformation data.

[0015] In some of the embodiments, deformation monitoring is performed during the lifting process using a total station.

[0016] In some of the embodiments, in step S5, the amount of arching at the overlap between the next-order grid and the previous-order grid is adjusted according to the verification result of the previous-order grid.

[0017] Compared with the prior art, the above invention has at least one of the following advantages or beneficial effects:

[0018] The present invention provides a construction method for implementing pre-arching in the design and assembly stage during the cumulative lifting process of a stepped grid structure by predicting and taking into account the annular gradient deformation of each step of the grid due to force. The method can significantly improve the construction accuracy and efficiency of the stepped grid structure, reduce the subsequent adjustment workload, and reduce the additional expenses and time costs caused by deformation adjustment. At the same time, through accurate prediction and pre-arching, the stability and safety of the grid structure during long-term use are ensured, which has important economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention and its features, appearance and advantages will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings. The same reference numerals indicate the same parts in all the drawings. The drawings are not drawn to scale, and emphasis is placed on illustrating the subject matter of the present invention.

[0020] Figure 1It is a flow chart of a pre-arching construction method of a stepped grid structure in an embodiment of the present invention;

[0021] Figure 2 Schematic diagram of an annular gradient deformation prediction model in an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of a ring-shaped gradient deformation prediction model for simulating and analyzing deformation in an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of performing annular gradient division on a grid in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of an arch simulation structure in an embodiment of the present invention;

[0025] Among them, 1. Grid system; 2. Step connection system; 3. Support system; 4. Annular gradient deformation prediction model; 5. Simulation analysis value; 6. Step grid; 7. Deformation point with maximum deflection; 8. Annular gradient dividing line; 9. Annular gradient divergence direction; 10. Grid of original structure before arching; 11. Simulation prediction of grid structure after arching; 12. Grid structure after arching with 75% simulation value. DETAILED DESCRIPTION

[0026] The present invention is further described below with reference to the accompanying drawings and specific embodiments, but is not intended to be a limitation of the present invention.

[0027] like Figure 1 As shown, the present invention discloses a pre-arching construction method for a stepped grid structure, wherein the stepped grid comprises a three-step grid; specifically, the method comprises the following steps:

[0028] Step S1, establishing a ring gradient deformation prediction model 4 suitable for the stepped grid structure through finite element analysis, such as Figure 2 As shown, the annular gradient deformation prediction model 4 includes a grid system 1, a step connection system 2 and a support system 3; and according to the information data of the stepped grid structure, the annular gradient deformation prediction model 4 is used to predict the deflection deformation law of each grid in the stepped grid structure during the cumulative lifting process, that is, the corresponding simulation analysis value 5 is obtained, such as Figure 3 The information data of the stepped grid structure includes the material, structural parameters, load conditions and environmental conditions of the stepped grid structure; that is, the annular gradient deformation prediction model 4 can take into account factors such as different material properties, structural dimensions, load conditions and environmental conditions, and accurately predict the deflection deformation law of the grid during the cumulative lifting process.

[0029] Step S2, for each level of grid, i.e., the level grid 6 in the figure, select the deformation point 7 with the largest deflection on the level grid as the annular gradient divergence center of the level grid, and use the set deflection change value of the level grid (the set deflection change value can be set according to the specific process requirements, the deflection change value can be 1cm, 2cm, 3cm or 4cm, etc., and the gradient division can be reasonably allocated according to the affected node area and number) as the gradient interval to perform annular gradient division on the level grid, that is, draw annular gradient division line 8 along the annular gradient divergence direction 9, such as Figure 4 As shown; and the arch value corresponding to each annular gradient is obtained according to the simulation analysis deformation value corresponding to each annular gradient.

[0030] Step S3, integrating the assembly node data of each order of grid according to the results of the annular gradient division on each order of grid, and performing data superposition processing with reference to the arch value of the annular gradient where each assembly node is located to obtain the pre-arch assembly data of each assembly node; that is, compiling an arch table before assembly to form relevant arch data as a basis for ground assembly of the grid structure, ensuring that the grid can naturally fit the design shape when it is accumulated and lifted to the final position, thereby reducing or eliminating the need for subsequent adjustments.

[0031] Specifically, the arching value of each annular gradient should be consistent with the reverse deformation trend of the structure as much as possible; in addition, considering the welding shrinkage deformation of the structure, the arching value should be less than the predicted value, and the arching value of the deformation point with the largest deflection on the stepped grid structure is set according to 70% to 80% of the simulated analysis deformation value of the deformation point with the largest deflection (for example, 70%, 75%, 76% or 80%, etc., and 75% in this embodiment); the arching value corresponding to each annular gradient is set according to 70% to 80% of the simulated analysis deformation value corresponding to the annular gradient (for example, 70%, 75%, 76% or 80%, etc., and 75% in this embodiment), such as Figure 5 As shown, 10 is the original structure grid without arching, 11 is the simulated predicted grid structure after arching, and 12 is the simulated value grid structure after 75% arching; the simulated value grid structure after 75% arching is more reasonable.

[0032] Step S4, assembling each level of grid according to the pre-arched assembly data to form the stepped grid structure. Specifically, for each level of grid, assembling is performed with the deformation point with the largest deflection on the level of grid as the starting position, and during the assembly process, the accuracy is checked every 2 to 3 grids, and after confirming that the accuracy meets the design specification requirements, the assembly continues to expand outward.

[0033] Step S5, the stepped grid structure is cumulatively expanded and lifted in stages from high to low, and deformation monitoring is performed using a total station during the lifting process, and the accuracy of the annular gradient deformation prediction model is verified through real-time feedback of deformation data.

[0034] In the above S4, the overlapping parts of the next-order grid and the previous-order grid are not spliced ​​first. In the step S5, the arching amount of the overlapping parts of the next-order grid and the previous-order grid is fine-tuned according to the verification result of the previous-order grid to ensure the construction accuracy, and the overlapping parts are spliced ​​after the arching amount is adjusted.

[0035] After the above-mentioned stepped grid structure is lifted to the designed height, the structural positioning is adjusted, and after the positioning is accepted, the rods are supplemented to complete the final fixation.

[0036] In summary, the present invention provides a construction method for implementing pre-arching in the design and assembly stage by predicting and considering the annular gradient deformation of each step of the grid structure due to force during the cumulative lifting process. This method effectively improves the installation accuracy of the grid structure, reduces the subsequent adjustment workload, and ensures the safety and stability of the structure.

[0037] Those skilled in the art should understand that those skilled in the art can implement variations by combining the prior art and the above embodiments, which will not be described in detail here. Such variations do not affect the essential content of the present invention, and will not be described in detail here.

[0038] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, or modify them into equivalent embodiments of equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention are still within the scope of protection of the technical solutions of the present invention.

Claims

1. A method for pre-arching construction of a stepped grid structure, wherein the stepped grid comprises a multi-step grid; characterized in that: The method comprises the following steps: Step S1, establishing an annular gradient deformation prediction model applicable to a stepped grid structure, and using the annular gradient deformation prediction model to predict the deflection deformation law of each step of the stepped grid structure during the cumulative lifting process according to the information data of the stepped grid structure; Step S2, for each grid, select the deformation point with the largest deflection on the grid as the annular gradient divergence center of the grid, and divide the grid into annular gradients with the set deflection change value of the grid as the gradient interval, and obtain the arch value corresponding to each annular gradient according to the simulation analysis deformation value corresponding to each annular gradient; Step S3, integrating the assembly node data of each order of grid frames according to the results of the annular gradient division on each order of grid frames, and performing data superposition processing with reference to the arch value of the annular gradient where each assembly node is located to obtain the pre-arch assembly data of each assembly node; Step S4, assembling each step of the grid according to the pre-arched assembly data to form the stepped grid structure.

2. The pre-arching construction method of the stepped grid structure according to claim 1, characterized in that: A ring-shaped gradient deformation prediction model suitable for stepped grid structures was established through finite element analysis.

3. The pre-arching construction method of the stepped grid structure according to claim 1, characterized in that: The information data of the stepped grid structure includes the material, structural parameters, load conditions and environmental conditions of the stepped grid structure.

4. The pre-arching construction method of the stepped grid structure according to claim 1, characterized in that: The arching value of the deformation point with the largest deflection on the stepped grid structure is set according to 70% to 80% of the simulation analysis deformation value of the deformation point with the largest deflection.

5. The pre-arching construction method of the stepped grid structure according to claim 1, characterized in that: The arching value corresponding to each annular gradient is set at 70% to 80% of the simulation analysis deformation value corresponding to the annular gradient.

6. The pre-arching construction method of the stepped grid structure according to claim 1, characterized in that: In step S4, for each grid, the grid is assembled starting from the deformation point with the largest deflection on the grid, and a check is performed every 2 to 3 grids during the assembly process. After confirming that it meets the design specification requirements, the assembly is continued to expand outwards.

7. The pre-arching construction method of the stepped grid structure according to claim 1, characterized in that: The construction method also includes: Step S5, cumulatively expanding and lifting the stepped grid structure from high to low in stages, and implementing deformation monitoring during the lifting process, and verifying the accuracy of the annular gradient deformation prediction model through real-time feedback of deformation data.

8. The pre-arching construction method of the stepped grid structure according to claim 7, characterized in that: The total station is used to carry out deformation monitoring during the lifting process.

9. The pre-arching construction method of the stepped grid structure according to claim 7, characterized in that: In step S5, the amount of arching at the overlap between the next-order grid and the previous-order grid is adjusted according to the verification result of the previous-order grid.

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