A BIM-based design method for prestressed hollow slabs

Abstract

This invention relates to the field of prestressed hollow core slab design. Currently, the process design for hollow core slab systems is unclear. This invention proposes a BIM-based prestressed hollow core slab design method, comprising: establishing a BIM model of the framework; providing a prestressed hollow core slab BIM database to the designer; determining the design load values ​​for the spans, the thickness of the prestressed hollow core slabs, and the initial layout direction; determining the slab direction layout and reinforcement for each span; determining the final simply supported layout diagram of the prestressed hollow core slabs and ensuring the accuracy of the layout; determining the locations of water and electricity pipes for the hollow core slabs and the locations of openings below the slab holes; outputting overall project information data reports; generating production processing tables for each production line; outputting the production processing tables to the factory for standardized assembly line production; generating QR codes through input into the production management system; and on-site construction and installation. This method improves production efficiency, achieves seamless integration from design to production and construction, and enables precise construction, demonstrating promising development prospects in the field of prestressed hollow core slab design.

Description

Technical Field

[0001] This invention relates to the field of prestressed hollow slab design technology, and in particular to a BIM-based prestressed hollow slab design method. Background Technology

[0002] Currently, Building Information Modeling (BIM) is a new tool for architecture, engineering, and civil engineering; among them, the BIM platform is a computer-aided design platform that is mainly based on three-dimensional graphics, object-oriented, and related to architecture.

[0003] As a floor system, prestressed hollow slabs have advantages such as high quality, fast construction, strong load-bearing capacity, and green construction. With the development of prefabricated buildings, they are increasingly matched with frame structure systems and are more often used in the floor slabs of large-span, large-space public and residential buildings.

[0004] The prestressed hollow slabs are produced using advanced Finnish equipment on a long-line production line with a pre-tensioning method. They are formed by shearing and extrusion using automated equipment, and after reaching a certain strength, they are released as a whole. The slabs are then cut into sections according to the design length requirements of the components using fully automated cutting equipment, and finally hoisted to the storage yard for natural curing.

[0005] Currently, with the development of prestressed hollow core slabs, there is no clear approach to the process design of the entire hollow core slab system. Solving these problems requires significantly promoting the in-depth development of hollow core slabs. Existing issues include: 1. Hollow core slabs have not been used in my country for long, resulting in a lack of relevant guidelines for their design and construction; 2. Hollow core slab layout design; 3. The calculation of quantities is cumbersome, and the modification process and subsequent modifications significantly increase the workload; moreover, improper design can easily lead to safety hazards and material waste; 4. Insufficient team collaboration. For different specialized formwork designs within the same project, if the various teams do not communicate in a timely manner, duplicate designs often occur at complex node locations, reducing the efficiency of project design and construction.

[0006] Before designing prestressed hollow slabs, factors such as component connection nodes, support lengths, design bearing capacity, and whether there are post-cast strips are determined, which is generally done through CAD layout design. Summary of the Invention

[0007] In order to overcome the shortcomings of existing technologies, this invention provides a BIM-based design method for prestressed hollow slabs, solving the problem of the lack of existing hollow slab system design.

[0008] The technical solution is a BIM-based design method for prestressed hollow slabs, comprising the following steps:

[0009] S1. Create a BIM model of the steel frame or concrete frame;

[0010] S2. Provide the designer with a BIM database for prestressed hollow slabs, including parameter information such as thickness, allowable load table, unit weight, thermal conductivity, and fire rating for selectable parameters;

[0011] S3. Determine the design load value of each frame axis span in the frame: Determine the design load value of each axis span in each floor as the live load value, without considering the self-weight of the slab and the weight of the grout;

[0012] S4. Preliminary determination of the thickness of the prestressed hollow slab;

[0013] S5. Determine the preliminary layout direction of the prestressed hollow slabs: When the ratio of the longitudinal and transverse lengths of each span in each layer is less than 1.5, arrange them according to the long span direction; when the ratio of the longitudinal and transverse lengths of each span in each layer is greater than 1.5, arrange them according to the short span direction.

[0014] S6. Determine the directional arrangement of the cross plates for each axis;

[0015] S7. Determine the reinforcement of each slab across each axis in each floor. If increasing the reinforcement of each slab across each axis cannot meet the load requirements, return to S4, redetermine the thickness of the prestressed hollow slab, and redetermine the reinforcement of each slab across each axis based on the redetermined thickness of the prestressed hollow slab.

[0016] S8. Based on the connection nodes and water and electricity requirements, perform preliminary layout and optimization to determine the final prestressed hollow slab simply supported layout: Based on the design requirements of the connection nodes, determine the support length, the method of handling the missing corner of the prestressed hollow slab, the node treatment of non-standard sections, and the optimization of the position of the post-pouring strip. Using the plan view as the main interface, form a layout of one header, one stretcher, or a combination of header and stretcher by closely splicing the slabs together.

[0017] S9. Ensure the accuracy of the arrangement of prestressed hollow slabs. Specifically, use collision checks to check beams, columns, and walls that may come into contact with the hollow slabs to ensure the accuracy of the hollow slab arrangement.

[0018] S10. Accurately determine the location of water and electricity pipes in hollow slabs and the location of openings below the slab holes. The principle of water and electricity pipe layout is: water and electricity pipes should be laid through the upper and lower lines of the wall as much as possible, or horizontal pipes should be laid through the holes in the hollow slab, and then the wiring should be completed by turning up the end of the hollow slab and passing through the openings at the bottom of the hollow slab holes.

[0019] S11. Output key information data reports for the prestressed hollow slabs of the entire project, including technical parameters such as hollow slab thickness, actual length, quantity, reinforcement parameters, concrete strength grade, protective layer thickness, and information on hollow slab corner type, quantity, installation direction, and opening location;

[0020] S12. Calculate the technical parameters of hollow slabs using an Excel spreadsheet to create a production and processing table for each production line. Specifically, calculate the initial tension value, elongation, and corresponding tension force of the steel strands, and combine this with the production line length limitations to output hollow slabs with the same reinforcement and thickness along a single line, thus creating a production and processing table.

[0021] S13. Output the production and processing schedule to the factory and carry out standardized assembly line production;

[0022] S14. A QR code is generated through the input of the production management system. A unique QR code is generated for each board, and various data parameters are stored in it. At the same time, according to the installation needs of the hollow board, the area and location information of the hollow board are extracted for inventory management and transportation.

[0023] S15. Precise on-site construction and installation: During on-site construction, installation information is obtained through QR codes to carry out precise on-site construction and installation.

[0024] The technical advantages of this invention are as follows: Compared with the traditional CAD design and production model, 1) it optimizes the prestressed hollow slab from the design stage, greatly improving design and production efficiency; 2) during the design phase, this invention optimizes the reinforcement parameters of the slab by adhering to the principle that the allowable load value of the slab is less than or close to the design load value, thus reducing costs; 3) by limiting the longitudinal and transverse length ratios of each span of each floor, and based on the premise of meeting the bearing capacity, it quickly realizes the layout scheme of the same thickness hollow floor slabs in a head-and-groove configuration according to the principle of maximizing the span. This scheme reduces the number of slab cuts and improves the slab processing efficiency; 4) this invention simulates the installation and construction of hollow slabs in actual projects, resolving potential problems such as collisions, water and electricity openings, and post-pouring strip treatment in advance in the model, and conducting secondary detailed design for any problems that arise. It also completes the processing of hollow slabs with special requirements in advance on the factory assembly line, greatly reducing the workload of secondary operations on the construction site and effectively improving the accuracy of construction; 5) the integration and analysis of data enables seamless connection from the design stage to the production and construction stages, ensuring efficient production and precise construction. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1: By Figure 1 A BIM-based design method for prestressed hollow slabs is presented, comprising the following steps:

[0028] S1. Create a BIM model of the steel frame or concrete frame;

[0029] S2. Provide the designer with a BIM database for prestressed hollow slabs, including parameter information such as thickness, allowable load table, unit weight, thermal conductivity, and fire rating for selectable parameters;

[0030] S3. Determine the design load value of each frame axis span in the frame: Determine the design load value of each axis span in each floor, which is the sum of the live load values, without considering the self-weight of the slab and the weight of the grout;

[0031] S4. Preliminary determination of the thickness of the prestressed hollow slab;

[0032] S5. Determine the preliminary layout direction of the prestressed hollow slabs: When the ratio of the longitudinal and transverse lengths of each span in each layer is less than 1.5, arrange them according to the long span direction; when the ratio of the longitudinal and transverse lengths of each span in each layer is greater than 1.5, arrange them according to the short span direction.

[0033] S6. Determine the directional arrangement of the cross plates for each axis;

[0034] S7. Determine the reinforcement of each slab across each axis in each floor. If increasing the reinforcement of each slab across each axis cannot meet the load requirements, return to S4, redetermine the thickness of the prestressed hollow slab, and redetermine the reinforcement of each slab across each axis based on the redetermined thickness of the prestressed hollow slab.

[0035] S8. Based on the connection nodes and water and electricity requirements, perform preliminary layout and optimization to determine the final prestressed hollow slab simply supported layout: Based on the design requirements of the connection nodes, determine the support length, the method of handling the missing corner of the prestressed hollow slab, the node treatment of non-standard sections, and the optimization of the position of the post-pouring strip. Using the plan view as the main interface, form a layout of one header, one stretcher, or a combination of header and stretcher by closely splicing the slabs together.

[0036] S9. Ensure the accuracy of the arrangement of prestressed hollow slabs. Specifically, use collision checks to check beams, columns, and walls that may come into contact with the hollow slabs to ensure the accuracy of the hollow slab arrangement.

[0037] S10. Accurately determine the location of water and electricity pipes in hollow slabs and the location of openings below the slab holes. The principle of water and electricity pipe layout is: water and electricity pipes should be laid through the upper and lower lines of the wall as much as possible, or horizontal pipes should be laid through the holes in the hollow slab, and then the wiring should be completed by turning up the end of the hollow slab and passing through the openings at the bottom of the hollow slab holes.

[0038] S11. Output key information data reports for the prestressed hollow slabs of the entire project, including technical parameters such as hollow slab thickness, actual length, quantity, reinforcement parameters, concrete strength grade, protective layer thickness, and information on hollow slab corner type, quantity, installation direction, and opening location;

[0039] S12. Calculate the technical parameters of hollow slabs using an Excel spreadsheet to create a production and processing table for each production line. Specifically, calculate the initial tension value, elongation, and corresponding tension force of the steel strands, and combine this with the production line length limitations to output hollow slabs with the same reinforcement and thickness along a single line, thus creating a production and processing table.

[0040] S13. Output the production and processing schedule to the factory and carry out standardized assembly line production;

[0041] S14. A QR code is generated through the input of the production management system. A unique QR code is generated for each board, and various data parameters are stored in it. At the same time, according to the installation needs of the hollow board, the area and location information of the hollow board are extracted for inventory management and transportation.

[0042] S15. Precise on-site construction and installation: During on-site construction, installation information is obtained through QR codes to carry out precise on-site construction and installation.

[0043] The BIM software used in this invention is Revit software; the production management system used is any of the currently common software in the industry, such as PCMES, Huipu, iPC, etc.; the BIM supporting auxiliary software used is any of the currently common software in the industry, such as Navisworks, Glodon BIM Quantity Calculation, Pinming BIM software, etc.

[0044] The BIM-based design method for prestressed hollow slabs of this invention can improve design efficiency, ensure design accuracy, and reduce costs. Simultaneously, it reduces the number of layout steps and computational loads for different building design requirements within the industry. In traditional design models, each unit develops its own design, which is then submitted to the architect, relying entirely on drawings for information transmission, resulting in low efficiency. However, using the BIM design method of this invention, architects can use BIM-based analysis software to integrate the BIM files submitted by all parties, facilitating a realistic representation of the overall effect and enabling automatic clash detection and other analyses.

[0045] The present invention has been described in detail above through specific embodiments and examples, but these are not intended to limit the invention. Many modifications and improvements can be made by those skilled in the art without departing from the principles of the invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A BIM-based design method for prestressed hollow slabs, characterized in that, Includes the following steps: S1. Establish a BIM model of the framework; S2. Provide the design team with a BIM database for prestressed hollow slabs; S3. Determine the design load value for the frame axis span of each floor in the frame; S4. Preliminary determination of the thickness of the prestressed hollow slab; S5. Determine the initial layout direction of the prestressed hollow slabs; S6. Determine the directional arrangement of the cross plates for each axis; S7. Determine the reinforcement of each slab across each axis in each floor. If increasing the reinforcement of each slab across each axis cannot meet the load requirements, return to S4, redetermine the thickness of the prestressed hollow slab, and redetermine the reinforcement of each slab across each axis based on the redetermined thickness of the prestressed hollow slab. S8. Based on the connection nodes and water and electricity requirements, conduct preliminary layout and optimization to determine the final simply supported layout diagram of the prestressed hollow slab; S9. Ensure the accuracy of the prestressed hollow slab layout; S10. Accurately determine the location of water and electricity pipes for hollow slabs and the location of openings below the slab holes; S11. Output key information data reports for the prestressed hollow slabs of the entire project; S12. Calculate the technical parameters of the hollow core slab using an Excel spreadsheet to generate a production and processing schedule for each production line; S13. Output the production and processing schedule to the factory and carry out standardized assembly line production; S14. A QR code is generated through input from the production management system; S15. Precise on-site construction and installation; In step 5, when the ratio of the longitudinal and transverse lengths of each span on each floor is less than 1.5, the arrangement follows the direction of the longer span; when the ratio of the longitudinal and transverse lengths of each span on each floor is greater than 1.5, the arrangement follows the direction of the shorter span.

2. The BIM-based prestressed hollow slab design method according to claim 1, characterized in that, In step 8, the final simply supported layout of the prestressed hollow slab is determined. Specifically, based on the design requirements of the connection nodes, the support length, the method for handling missing corners of the prestressed hollow slab, the node treatment of non-standard sections, and the optimization of the position of the post-cast strip are determined. The plan view is used as the main interface, and the layout is formed by the close splicing of the slabs to form a combination of one header, one stretcher, or a combination of header and stretcher.

3. The BIM-based prestressed hollow slab design method according to claim 1, characterized in that, In step 9, the accuracy of the prestressed hollow slab layout is ensured by using a collision check to check the beams, columns, and walls that may come into contact with the hollow slabs to ensure the accuracy of the hollow slab layout.

4. The BIM-based prestressed hollow slab design method according to claim 1, characterized in that, In step 2, the BIM database for prestressed hollow slabs includes parameter information such as thickness, allowable load table, unit weight, thermal conductivity, and fire resistance rating. In step 11, a key information data report of the prestressed hollow slabs for the entire project is output, including technical parameters such as hollow slab thickness, actual length, quantity, reinforcement parameters, concrete strength grade, and protective layer thickness, as well as information on hollow slab corner type, quantity, installation direction, and opening location.

5. The BIM-based design method for prestressed hollow slabs according to claim 1, characterized in that, In step 12, the initial tension value, elongation, and corresponding tension force technical parameters of the steel strand are calculated. Combined with the production line length limit, hollow slabs with the same reinforcement and thickness are output on a single line to form a production processing table.

6. The BIM-based design method for prestressed hollow slabs according to claim 1, characterized in that, In step 14, a unique QR code is generated for each board through input from the production management system, and various data parameters are stored in it. At the same time, according to the installation requirements of the hollow board, the area and location information of the hollow board are extracted for inventory management and transportation.

7. The BIM-based design method for prestressed hollow slabs according to claim 1, characterized in that, In step 15, during on-site construction, installation information is obtained through QR codes to enable precise on-site construction and installation.

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