High and large formwork support design method based on BIM technology

Abstract

The invention provides a high and large formwork support design method based on a BIM technology. The high and large formwork support design method comprises the following steps that S1, a model is obtained; s2, generating a template; s3, performing analysis; s4, performing inspection; s5, generating a rule; s6, generating security information; and S7, output storage: storing the safety information report and the template support model in a database. According to the method, the inspected high and large formwork support model can be directly generated from the concrete structure three-dimensional model based on a rule generation mode, the labor cost of designers is greatly reduced, and the construction safety problem after the scheme is adopted is effectively ensured; the operation is simple and easy to adjust, the logic is clear and easy to implement, and the certainty of design can be effectively guaranteed based on a rule generation mode.

Description

Technical Field

[0001] The invention relates to a high and large formwork support design method based on BIM technology, belonging to the technical field of electrical digital data processing. Background Art

[0002] When designing large concrete structure projects based on BIM technology, the three-dimensional model of the concrete main structure is generally designed first, and then the formwork support is designed based on the concrete structure. When the height exceeds 4m, the formwork support is called a tall formwork support. The main structure is the main structure of the outer formwork frame, and steel structure supports are added as supports inside the non-enclosed space enclosed by the outer formwork. The drawing of the support is particularly cumbersome and wastes a lot of manpower. As a result, designers often use ready-made solutions from other projects to paste and modify them. However, such modifications can easily cause problems in the current project and affect construction safety. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a tall formwork support design method based on BIM technology. The tall formwork support design method based on BIM technology can directly generate a tested tall formwork support model from the three-dimensional model of the concrete structure based on rule generation, which greatly reduces the manpower cost of designers and effectively ensures construction safety after the scheme is adopted.

[0004] The present invention is achieved through the following technical solutions.

[0005] The present invention provides a method for designing a tall formwork support based on BIM technology, comprising the following steps: S1. Obtain model: obtain the three-dimensional model of the concrete structure from the database; S2, generating a template: obtaining a default generation rule list from a rule library, using the generation rules in the generation rule list as constraints, and generating a template support model according to the three-dimensional model of the concrete structure; S3. Analysis: First, conduct a safety analysis on each template in the template support model, then conduct a vertical force analysis on the entire template support model, and finally conduct a safety analysis on the connectors between multiple templates to obtain safety analysis data; the safety analysis of the template is to conduct a force analysis on the template and calculate the ratio between the template compressive strength and the concrete pouring pressure; the safety analysis of the connectors between multiple templates is to conduct a force analysis on the connectors and calculate the ratio between the splitting tensile strength of the connectors and the template force, where the template force is the sum of the external forces applied to the connectors by the templates connected to the connectors; S4, inspection: determine whether the safety analysis data exceeds the preset range, if it exceeds, proceed to the next step, if it is within the preset range, proceed to step S6; S5, generating rules: generating restrictive generation rules according to the security analysis data items exceeding the preset range, adding the restrictive generation rules to the generation rule list and returning to step S2; S6. Generate security information: Perform segmented judgment based on the security analysis data, mark the segmented judgment results in the security analysis data items and generate a security information report; S7. Output storage: store the safety information report and formwork support model in the database.

[0006] In step S5, before generating restrictive generation rules, it is first determined whether the number of times exceeding the preset range exceeds the preset number. If exceeded, a backup generation rule list is obtained from the rule library, and after replacing the default generation rule list with the backup generation rule list, the process returns to step S2.

[0007] The generation rule list includes: A. Thicken each structural surface in the three-dimensional model of the concrete structure outwards, and use the thickened part as a template; B. Perform collision detection on the templates, and perform Boolean AND operation on the colliding templates to form a template; C. The narrower template among the multiple templates that are closed frames in a vertical viewing angle is defined as the long side, and the wider template is defined as the short side, and the long side is extended to both ends at a fixed ratio; D. Filling the support structure in a fixed pattern within the closed frame; E. Add connectors where the short side connects to the long side.

[0008] The preset range is preset by the user.

[0009] The preset number of times is 5 to 10 times.

[0010] The generation rule list also includes: F. If the template size exceeds the preset upper limit, the template will be cut into two pieces at 80% to 90% of the preset upper limit, and a connector will be added at the junction of the two templates.

[0011] In the generation rule A, the thickness of the thickened part is preset by the user.

[0012] The beneficial effects of the present invention are: it can generate a tested tall formwork support model directly from the three-dimensional model of the concrete structure based on rule generation, greatly reducing the labor cost of designers and effectively ensuring construction safety after the scheme is adopted; the operation is simple and easy to adjust, the logic is clear and easy to implement, and the rule-based generation method can effectively guarantee the certainty of the design. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1is a schematic diagram of a process of at least one embodiment of the present invention; Figure 2 is realized Figure 1 Schematic diagram of system module connections of the process. DETAILED DESCRIPTION

[0014] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0015] A first embodiment of the present invention relates to Figure 1 A design method for tall formwork support based on BIM technology is shown, comprising the following steps: S1. Obtain model: obtain the three-dimensional model of the concrete structure from the database; S2, generating a template: obtaining a default generation rule list from a rule library, using the generation rules in the generation rule list as constraints, and generating a template support model according to the three-dimensional model of the concrete structure; S3. Analysis: First, conduct a safety analysis on each template in the template support model, then conduct a vertical force analysis on the entire template support model, and finally conduct a safety analysis on the connectors between multiple templates to obtain safety analysis data; the safety analysis of the template is to conduct a force analysis on the template and calculate the ratio between the template compressive strength and the concrete pouring pressure; the safety analysis of the connectors between multiple templates is to conduct a force analysis on the connectors and calculate the ratio between the splitting tensile strength of the connectors and the template force, where the template force is the sum of the external forces applied to the connectors by the templates connected to the connectors; S4, inspection: determine whether the safety analysis data exceeds the preset range, if it exceeds, proceed to the next step, if it is within the preset range, proceed to step S6; S5, generating rules: generating restrictive generation rules according to the security analysis data items exceeding the preset range, adding the restrictive generation rules to the generation rule list and returning to step S2; S6. Generate security information: Perform segmented judgment based on the security analysis data, mark the segmented judgment results in the security analysis data items and generate a security information report; S7. Output storage: store the safety information report and formwork support model in the database.

[0016] The above generation rules can be implemented using the external script of the BIM system, and the safety analysis and stress analysis can be implemented by calling the BIM system API.

[0017] The essence of generating the template in step S2 is to use the concrete structure three-dimensional model as a reference and adopt generation rules to obtain the template support model. For example, the concrete structure three-dimensional model t1 is {scale(cube,<20, 10, 5>),<3, 2, 3>}, which means a cube with origin coordinates <3, 2, 3> and size <20, 10, 5>. The generation rule is (trans t1 WCS cs_to0), which means that the concrete structure three-dimensional model t1 is translated to the cs_to position using the WCS coordinate system, and a new three-dimensional model t2, i.e., the template support model, is output. The cs_to assignment is generally (setq cs_to (a*kb*lc*m)), where a, b, and c are direction quantities, which are obtained by taking the relative outer side according to the orientation of the concrete structure three-dimensional model t1, and k, l, and m are extension distance quantities, which represent the distance between the concrete structure three-dimensional model t1 and the template support model t2. It can be seen that the generation rule list is essentially a set of script statements that may include execution instructions, judgment instructions, and assignment instructions. Another implementation method is to directly expand the outer side surface t1' of the concrete structure three-dimensional model t1 outward by a specified distance cs_to'. The specified distance cs_to' is directly specified in advance as a specific value such as 2, so the distance between the generated concrete structure three-dimensional model t1 and the formwork support model t2 is 2, and the generation rule can be specified as (if MEA(t2)>n cs_to'=1), which means that if the volume of the formwork support model t2 is less than the specified value n, the aforementioned specified distance cs_to' is changed to a value of 1 for calculation. It can be seen that the generation rule list is essentially a set of script statements that may include judgment instructions and assignment instructions, and the execution instructions are implemented by a set of specific global instructions. Conceptually, the script statement specifies the execution constraint of the calculation method, which is more obvious in the second implementation method. Therefore, executing the generation rule can also be called taking the generation rule as a constraint.

[0018] The essence of step S5 is to substitute the safety analysis data items into the preset script statements to obtain executable script statements. For example, if one of the safety analysis data items corresponds to the outer volume q of the above-mentioned template support model t2 exceeding the preset range p, then the outer volume q is substituted into the restrictive generation rule cs_to'= cs_to'-u_ sqr (q,p), wherein u_sqr() is a preset calculation function. At this time, q already has a specific value, and the generation rule can be calculated. By adding it to the generation rule list, the constraint cs_to'=1-u_ sqr (q,p) can be added to the constraint of the aforementioned generation rule (if MEA(t2)>n cs_to'=1). Since this generation rule is a further constraint, it is called a restrictive generation rule.

[0019] For ease of understanding, the above descriptions of the generation rules are in the simplest form that is easiest to understand. In practice, the scripting language syntax of the 3D modeling software can be fully utilized, such as the standard function library of Autolisp.

[0020] In step S6, the segmented judgment result is marked in the security analysis data item. In essence, this is done by adding empty data to the security analysis data item and assigning the segmented judgment result to the empty data. For example, if the security analysis data item a is {a1, a2}, then the segmented judgment result b is assigned to the newly added empty data in the security analysis data item a, so that the security analysis data item a is {a1, a2, b}.

[0021] The safety analysis in step S3 is specifically implemented by the BIM system. There are also typical implementation methods in the prior art, such as a crack identification and building structure safety analysis method disclosed in Chinese patent application number CN202410946791.0, and a highway project safety assessment system based on BIM disclosed in Chinese patent application number CN202110513642.1. Since the specific implementation of the safety analysis is not the main content of the present application, its implementation method is also not within the technical conception scope of the present application. The BIM system in the prior art has a variety of ready-made implementation methods. The technical solution based on the present application only needs to call the API provided by the BIM system used and compile the generation rules accordingly.

[0022] The second embodiment of the present invention is substantially the same as the first embodiment, mainly in that, in step S5, before generating restrictive generation rules, it is first determined whether the number of times exceeding the preset range exceeds the preset number. If so, a list of alternative generation rules is obtained from the rule base, and after replacing the default list of generation rules with the list of alternative generation rules, the process returns to step S2.

[0023] Furthermore, the list of generated rules includes, A. Thicken each structural surface in the three-dimensional model of the concrete structure outwards, and use the thickened part as a template; B. Perform collision detection on the templates, and perform Boolean AND operation on the colliding templates to form a template; C. The narrower template among the multiple templates that are closed frames in a vertical viewing angle is defined as the long side, and the wider template is defined as the short side, and the long side is extended to both ends at a fixed ratio; D. Filling the support structure in a fixed pattern within the closed frame; E. Add connectors where the short side connects to the long side.

[0024] It is easy to understand that in the execution of the generation rules, of course, it is necessary to first perform judgment and calculation of the inside and outside (generally calculated by the relative position of the components in the three-dimensional model relative to the overall center). The steps of judging the inside and outside belong to the conventional operations of the prior art, so they will not be traced back. In the above step A, outward thickening is to stretch the outer side surface outward by means of a surface stretching operation (the aforementioned moving method is only for the convenience of explanation, and the surface stretching parameters involve directional calculations, which are relatively complex and difficult to explain). The stretching amount is the thickening amount, which can be specifically specified in the generation rules. There is no special limitation on the specific thickening amount, and further adjustments are involved later. It should be set according to the needs of the specific application. The operation of taking the thickened part as the template actually requires only the three-dimensional model after the thickening operation to be thickened by the three-dimensional model before the operation using a Boolean subtraction operation.

[0025] The fixed ratio x in step C is generally pre-set by the user as a specific value in the range of 0.1~0.3. The multiple templates are based on the connection line r, and the distance L between the side s opposite to the connection line and the connection line r is regarded as the width of the template. The template with the smaller width of the two connected templates is the narrower template, and the template with the larger width is the wider template. When the widths of the two connected templates are the same, one of the templates is arbitrarily selected as the narrower template, and the other is corresponding to the wider template. During the extension operation, the side of the narrower template where the connection line r is located and the side of the side s opposite to the connection line are respectively stretched, and the surface stretching amount is L*fixed ratio x.

[0026] Furthermore, the preset range is preset by the user.

[0027] Furthermore, the preset number of times is 5 to 10 times.

[0028] Furthermore, the list of generated rules also includes, F. If the template size exceeds the preset upper limit, the template will be cut into two pieces at 80% to 90% of the preset upper limit, and a connector will be added at the junction of the two templates.

[0029] Furthermore, in the generation rule A, the thickness of the thickened portion is preset by the user.

Claims

1. A design method for tall formwork support based on BIM technology, characterized by: The following steps are involved: S1. Obtain model: obtain the three-dimensional model of the concrete structure from the database; S2, generating a template: obtaining a default generation rule list from a rule library, using the generation rules in the generation rule list as constraints, and generating a template support model according to the three-dimensional model of the concrete structure; S3. Analysis: First, conduct a safety analysis on each template in the template support model, then conduct a vertical force analysis on the entire template support model, and finally conduct a safety analysis on the connectors between multiple templates to obtain safety analysis data; The safety analysis of the formwork is to analyze the stress of the formwork and calculate the ratio between the compressive strength of the formwork and the concrete pouring pressure; The safety analysis of the connectors between multiple templates is to perform a stress analysis on the connectors and calculate the ratio between the splitting tensile strength of the connectors and the template force. The template force is the sum of the external forces applied to the connectors by the templates connected to the connectors. S4, inspection: determine whether the safety analysis data exceeds the preset range, if it exceeds, proceed to the next step, if it is within the preset range, proceed to step S6; S5, generating rules: generating restrictive generation rules according to the security analysis data items exceeding the preset range, adding the restrictive generation rules to the generation rule list and returning to step S2; S6. Generate security information: Perform segmented judgment based on the security analysis data, mark the segmented judgment results in the security analysis data items and generate a security information report; S7. Output storage: store the safety information report and formwork support model in the database.

2. The method for designing a tall formwork support based on BIM technology according to claim 1, characterized in that: In step S5, before generating restrictive generation rules, it is first determined whether the number of times exceeding the preset range exceeds the preset number. If exceeded, a backup generation rule list is obtained from the rule library, and after replacing the default generation rule list with the backup generation rule list, the process returns to step S2.

3. The method for designing a tall formwork support based on BIM technology as claimed in claim 1, characterized in that: The generation rule list includes: A. Thicken each structural surface in the three-dimensional model of the concrete structure outwards, and use the thickened part as a template; B. Perform collision detection on the templates, and perform Boolean AND operation on the colliding templates to form a template; C. The narrower template among the multiple templates that are closed frames in a vertical viewing angle is defined as the long side, and the wider template is defined as the short side, and the long side is extended to both ends at a fixed ratio; D. Filling the support structure in a fixed pattern within the closed frame; E. Add connectors where the short side connects to the long side.

4. The method for designing a tall formwork support based on BIM technology according to claim 1, characterized in that: The preset range is preset by the user.

5. The method for designing a tall formwork support based on BIM technology as claimed in claim 2, characterized in that: The preset number of times is 5 to 10 times.

6. The method for designing a tall formwork support based on BIM technology as claimed in claim 3, characterized in that: The generation rule list also includes: F. If the template size exceeds the preset upper limit, the template will be cut into two pieces at 80% to 90% of the preset upper limit, and a connector will be added at the junction of the two templates.

7. The method for designing a tall formwork support based on BIM technology as claimed in claim 3, characterized in that: In the generation rule A, the thickness of the thickened part is preset by the user.

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