High-precision Qirschner plate structure construction method based on BIM (Building Information Modeling) grid positioning

Abstract

The invention discloses a high-precision Qirschner plate structure construction method based on BIM (Building Information Modeling) grid positioning. The high-precision Qirschner plate structure construction method comprises the following steps of S1, accurately positioning a Qirschner tube based on a BIM technology; s2, setting up a ring lock scaffold supporting system and rechecking the elevation of the ring lock scaffold supporting system; s3, template laying and elevation re-checking; s4, carrying out center point lofting on the basis of BIM grid lines; s5, #-shaped dense rib beam steel bar binding and elevation rechecking are carried out; s6, mounting a cylinder body and accessories of the Qirschner cylinder; and S7, concrete pouring is conducted on the ultra-long and ultra-thick Qirschner plate. According to the method, on one hand, the clean plant hollowed-out floor slab Qirschner tubes can be rapidly arranged and positioned in combination with the BIM technology, on the other hand, by optimizing all links of Qirschner plate construction, the construction period can be effectively shortened, the construction quality can be improved, the high-precision design requirement is met, meanwhile, the pouring quality problem of ultra-long and ultra-thick dense rib beam plates and the slurry leakage pain point are solved, and the construction efficiency is improved. The economic benefit and the social benefit are obvious.

Description

Technical Field

[0001] This invention belongs to the field of cleanroom construction technology, specifically relating to a high-precision construction method for Qishi plate structures based on BIM grid positioning. Background Technology

[0002] Semiconductor chips, as the core of modern information technology, play a vital role in global economic development. In electronic chip manufacturing plants within the semiconductor industry, cleanrooms are critical and core areas. The form and construction of the floor slabs in these core areas are key technologies for ensuring their cleanliness levels, and the Gibbs plate structure is well-suited to these technical requirements and development needs. Gibbs plate floor structures have extremely high requirements for flatness, typically 2mm / 2m. Traditional construction procedures struggle to control the flatness of Gibbs plates. Gibbs plates require large-area laying, easily leading to accumulated accuracy errors, and also resulting in high construction cycles and costs. Furthermore, the space between the closely spaced ribbed beams is very small, the operating surface is narrow, and the installation of reinforcing steel is extremely difficult. Therefore, accurately positioning the Gibbs tubes and ensuring their installation accuracy is crucial. Summary of the Invention

[0003] To address the aforementioned problems, this invention discloses a high-precision construction method for Qishi plate structures based on BIM grid positioning.

[0004] The specific plan is as follows:

[0005] A high-precision construction method for Qishi plate structures based on BIM grid positioning includes the following steps:

[0006] S1: Accurately locate the girders based on BIM technology, and optimize the layout of the girders grid lines and beam reinforcement positioning lines using Revit software;

[0007] S2: The formwork support system adopts disc-lock scaffolding, with adjustable top supports on the adjustable supports, and then horizontal and vertical bidirectional steel keels are laid. After completion, the elevation is checked.

[0008] S3: Hollow plastic formwork is used for building formwork. The joints should be aligned. Wooden blocks are used to fix it on the back side. A level is used to check the elevation and flatness of the formwork.

[0009] S4: Locate the center point of the Qishi cylinder based on the BIM grid lines, and install the positioning chassis;

[0010] S5: Verify the specifications, quantity, stirrup spacing, and connection method of the main beam and grid beam reinforcement; bind the grid-type ribbed beam reinforcement and verify the elevation according to the beam reinforcement positioning line.

[0011] S6: Installation of the Qishi cylinder body and its accessories, the key steps are Qishi cylinder anti-leakage treatment, Qishi cylinder anti-displacement treatment and elevation verification;

[0012] S7: Ultra-long and ultra-thick Qishi slab concrete pouring, the key steps are the zoning and isolation of concrete pouring and the layered pouring of ultra-thick concrete in the same zone.

[0013] Further, in step S1, a precise structural model is imported into the BIM, relevant parameters are established based on the production drawings of the Qishi tube, the accuracy and range of the mesh division are clarified, and the curtain wall mesh is drawn in the Qishi slab floor outline to achieve precise positioning; specifically, a mesh adaptive optimization algorithm based on genetic algorithm is adopted, with the uniformity of Qishi tube spacing and minimization of conflict with beam reinforcement as the objective function, and its formula is:

[0014]

[0015] in For the first The actual distance between each Qishi cylinder and its adjacent cylinder. To design the average spacing, To account for the amount of conflict with the beam reinforcement, , The optimal grid layout scheme is obtained through iterative calculation, using weighting coefficients.

[0016] The accuracy of the mesh division is dynamically determined by a surface curvature algorithm based on point cloud data fitting. The mesh is automatically densified in areas with large curvature variations. With local curvature The relationship satisfies:

[0017]

[0018] in Based on density, This is the curvature sensitivity coefficient.

[0019] Further, in step S2, the main keel uses H150*75*5*7 H-section steel, and the secondary keel uses 40*40 square steel. The adjustable top supports on the support frame are adjusted to ensure that the top surfaces of each frame are on the same horizontal plane. A laser leveling instrument is used to correct the level, and the elevation is checked and verified to be controlled within 2mm. The adjustment process of the adjustable top supports incorporates a deflection pre-compensation model based on elasticity theory. Before adjustment, the predicted deflection value Δ is calculated, and pre-lift compensation is performed during the initial elevation setting. The pre-lift amount... This is to ensure that the elevation still meets the 2mm error requirement after loading.

[0020] Furthermore, in step S3, adjacent template edges are fixed flat using steel nails, and a denser measurement method is adopted to ensure that the bottom elevation is controlled before the non-removable Qishi board is laid. The dense measurement uses a template flatness fitting algorithm based on the least squares method. By collecting elevation data of discrete points on the template surface, the best fitting plane is fitted, and the deviation of each measuring point from the plane is calculated. When there are three consecutive points | When the thickness exceeds 3mm, the system automatically identifies the area as requiring adjustment, guiding local leveling.

[0021] Further, in step S4, the center point of the zigzag cylinder is laid out using BIM-based grid positioning and layout. A positioning base is installed at the intersection of the layout lines, with an error not exceeding 2mm. The positioning base has four pre-processed marking lines, which are aligned with the lines extending from the intersection. Screw holes are drilled sequentially according to the diagonal principle. The positioning base must not be displaced during the drilling process, and no screw holes should be missed or omitted. A real-time correction system based on machine vision is integrated into the layout process. When installing the positioning base, a camera captures the image of the marking lines on the base and the cross lines on the ground. The center point offset is calculated using an image recognition algorithm. If it is greater than 2mm, an audible and visual alarm is triggered, and a correction direction vector is displayed to guide the adjustment.

[0022] Furthermore, in step S5, the reinforcement binding of the ribbed beams should be carried out in stages and directions according to the main beams and secondary beams. First, the main beams around the perimeter should be completed, and then the reinforcement binding of the secondary beams in one direction should be started. The deviation should not be greater than 2mm. After the reinforcement binding is completed, the elevation should be checked.

[0023] The rebar binding deviation control adopts an auxiliary positioning algorithm based on the combination of BIM and AR technologies. Construction workers view the virtual beam rebar positioning lines superimposed on the real scene through AR glasses, and the system calculates the deviation between the actual position of the rebar and the virtual positioning lines in real time. If the following conditions are met:

[0024]

[0025] in For virtual positioning line coordinates, These are the actual coordinates of the reinforcing bars.

[0026] Further, in step S6, the installation sequence of the Qishi cylinder is as follows: bottom cover installation → cylinder body installation → screw installation → top cover installation → grout leakage prevention treatment → displacement prevention treatment. The screw installation involves screwing any end of the double-ended screw into the center screw hole of the bottom cover, then fitting the top cover in, and tightening the top screw to fix the Qishi cylinder body. The grout leakage prevention treatment involves sealing the gap between the upper end of the Qishi cylinder body and the edge of the top cover, as well as the screw hole location, with adhesive tape. The tape is applied evenly and firmly along the gap, covering both sides. The displacement prevention treatment involves using wooden blocks to cap the Qishi cylinder. The wooden blocks are connected and fixed to the reinforcing beam with wire to prevent displacement of the Qishi cylinder during concrete pouring. After capping, the elevation must be checked. The wooden blocks are removed sequentially according to the pouring direction during subsequent layered pouring.

[0027] In the above-mentioned anti-displacement treatment, the fixing force F of the timber capping is verified by an anti-buoyancy calculation model based on fluid dynamics. The calculation formula is as follows:

[0028]

[0029] in For concrete density, It is the acceleration due to gravity. The volume of concrete displaced by the Gibbs pipe. The dynamic load factor is taken as 1.2~1.5. This is an estimated value for the lateral dynamic pressure generated by the flow of concrete.

[0030] Furthermore, in step S7, the concrete is poured in sections using isolation airbags for interception. The height of each layer in the same section should not exceed 350mm. The ABS capping timber of the Qishi cylinder can only be removed after the lower layer of concrete is poured. The upper layer of concrete should be poured 5mm higher than the surface of the Qishi cylinder to prevent settlement and facilitate finishing. The height of each layer in the same section is determined by an optimized formula based on the theory of concrete hydration heat conduction and initial setting time control. The optimal thickness of each layer is:

[0031]

[0032] in For the highest permissible core temperature, The temperature at which the mold is poured in. Thermal conductivity, The density of concrete. The heat yield per unit volume of hydration; optimize temperature control and construction efficiency while ensuring that the thickness does not exceed 350 mm.

[0033] The beneficial effects of this invention are as follows:

[0034] This invention utilizes BIM technology for precise positioning of the Gypsy tube, enabling rapid layout simulation before construction. Its feasibility and forward-looking approach provide numerous conveniences for subsequent on-site construction, fully considering the limitations of working space and improving construction efficiency. Traditional construction processes are optimized through layered control over each step, including support frame erection, formwork installation, Gypsy tube installation, rebar tying, and concrete pouring, ensuring that the precision of each process is within specified limits. The invention employs a combination of plastic formwork and square steel backing, improving the efficient utilization and turnover of materials. Leakage prevention treatment is applied to the Gypsy tube before concrete pouring, eliminating the need for epoxy coating inside the hole and on the bottom surface later, resulting in a more aesthetically pleasing and cleaner appearance. Timber is used for capping to prevent displacement of the Gypsy tube during pouring and to control the finished surface elevation. Conventional construction procedures are rationally interspersed with the positioning, installation, leakage prevention, and fixing of the Gypsy tube, significantly improving production efficiency. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the Qishi plate architecture system of the present invention.

[0036] Figure 2 This is a schematic diagram of the unit disc buckle frame of the present invention.

[0037] Figure 3 This is a schematic diagram of the BIM grid cross positioning of the present invention.

[0038] Figure 4 This is a schematic diagram of the key components of the Qishi plate of the present invention.

[0039] List of symbols in the attached diagram: 100-Disc buckle frame, 110-Plastic template, 120-Qi-type tube, 130-Main beam, 140-Ribbon beam, 150-Sealing tape, 160-Coping timber, 170-Isolation airbag, 101-Adjustable top support, 102-Main keel, 103-Secondary keel, 111-Cross positioning line. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the present invention clearer, 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention. In the description of the embodiments of this application, the terms "comprising," "including," or any other variations are intended to cover non-exclusive inclusion, the terms "first" and "second" may explicitly or implicitly include one or more of the features, and "multiple" means two or more, unless otherwise explicitly specified.

[0041] Because the construction process of Qishi slab structures is complex, traditional methods for controlling their flatness still rely on routine inspections and process handovers. Even minor errors at any stage can be amplified, affecting the flatness of the floor slab. This invention provides references for minimizing errors at each stage, ensuring the final construction quality to the greatest extent possible. The specific steps are as follows:

[0042] S1: Based on BIM technology, the Qishi tube is accurately positioned. The Qishi tube grid line 111 and the beam reinforcement positioning line are optimized and arranged using Revit software. The accurate structural model is imported into Revit, and relevant parameters are established according to the Qishi tube production drawings. The accuracy and range of the grid division are clarified. The "curtain wall grid" is drawn in the Qishi slab floor outline, with the two-dimensional frame column as a single grid. After drawing, multiple sets of modeling are repeated. Considering that the hidden beams in the openings are closely arranged with the Qishi tube, after the initial model is completed, the "collision check" command in Revit is run to perform collision analysis, and the collision units are optimized and adjusted to obtain the optimal solution.

[0043] S2: The formwork support system adopts a disc-lock scaffolding 100, with adjustable top supports 101 on the adjustable supports, and then horizontal and vertical bidirectional steel keels are laid. The main keel 102 is made of H150*75*5*7 H-shaped steel, and the secondary keel 103 is made of 40*40 square steel. The adjustable top supports on the adjustable support frame are adjusted to ensure that the top surfaces of each frame are on the same horizontal plane. A laser leveling instrument is used to correct the level. The elevation level is checked and verified to be controlled within 2mm.

[0044] S3: Fully lay 110mm construction formwork, ensuring alignment at the joints. Secure the formwork to the back using timber, and use steel nails to level the edges of adjacent formwork. Utilize frequent measurements to ensure the bottom elevation is controlled before laying the non-removable formwork. After laying the formwork, clean the surface, ensuring no nails, concrete, or other residue remains.

[0045] S4: Based on BIM, perform cross-layout of the center point of the Qishi cylinder 111. Install the positioning base at the intersection of the layout lines, with an error of no more than 2mm. There are 4 pre-processed marking lines on the positioning base. Align the 4 marking lines with the lines extending from the intersection of the lines. Drill screw holes in sequence according to the diagonal principle. Do not allow the positioning base to shift during the screw hole drilling process. Do not drill too few or too few screw holes.

[0046] S5: Verify the specifications, quantity, stirrup spacing, and connection method of the 130 main beam and the 140 grid-shaped ribbed beam reinforcement. Bind the 140 grid-shaped ribbed beam reinforcement according to the beam reinforcement positioning line. The reinforcement binding of the ribbed beam should be carried out in stages and directions according to the main beam and secondary beam. First, complete the surrounding main beams, and then start binding the reinforcement of the secondary beams in one direction. The deviation should not be greater than 2mm. After the reinforcement binding is completed, the elevation needs to be checked. During the construction process, the finished product of the positioning base should be protected.

[0047] S6: The installation sequence of the Qishi tube 120 is as follows: bottom cover installation → tube body installation → screw installation → top cover installation → grout leakage prevention treatment → displacement prevention treatment. First, install the bottom cover on the installed positioning plate, align it, and press it into place with appropriate force. Then install the tube body, screw any end of the double-ended screw into the center screw hole of the bottom cover, then put on the top cover, tighten the top screw, and fix the Qishi tube body. Next, perform grout leakage prevention treatment, seal the gap between the upper part of the Qishi tube body and the edge of the top cover and the screw hole position with sealing tape 150, and stick the tape evenly and firmly along the gap, and evenly stick it around both sides. Finally, perform displacement prevention treatment, use wooden blocks 160 to top the Qishi tube, and connect and fix the wooden blocks to the steel beam with iron wire to prevent the Qishi tube from shifting during concrete pouring. After the top is completed, the elevation must be checked. The wooden blocks are removed in sequence according to the pouring direction during the subsequent layered pouring process.

[0048] S7: The key steps in the concrete pouring of the ultra-long and ultra-thick Qishi slab are the isolation of the concrete pouring zones and the layered pouring of the ultra-thick concrete in the same zone. The concrete pouring zones are intercepted by the isolation airbag 170. The layered pouring height in the same zone does not exceed 350mm. The ABS top cover and the top wooden block of the Qishi cylinder can only be removed after the lower layer of concrete is poured. The upper layer of concrete must be 5mm higher than the surface of the Qishi cylinder to prevent settlement and facilitate finishing and leveling.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-precision construction method for Qishi plate structures based on BIM grid positioning, characterized in that: Includes the following steps: S1: Accurately locate the girders based on BIM technology, and optimize the layout of the girders grid lines and beam reinforcement positioning lines using Revit software; S2: The formwork support system adopts disc-lock scaffolding, with adjustable top supports on the adjustable supports, and then horizontal and vertical steel keels are laid. After completion, the elevation is checked. S3: Hollow plastic formwork is used for building formwork. The joints should be aligned. Wooden blocks are used to fix it on the back side. A level is used to check the elevation and flatness of the formwork. S4: Locate the center point of the Qishi cylinder based on the BIM grid lines, and install the positioning chassis; S5: Verify the specifications, quantity, stirrup spacing, and connection method of the main beam and grid beam reinforcement; and perform grid-type ribbed beam reinforcement binding and elevation verification according to the beam reinforcement positioning line. S6: Installation of the Qishi cylinder body and its accessories, the key steps are Qishi cylinder anti-leakage treatment, Qishi cylinder anti-displacement treatment and elevation verification; S7: Ultra-long and ultra-thick Qishi slab concrete pouring, the key steps are the zoning and isolation of concrete pouring and the layered pouring of ultra-thick concrete in the same zone.

2. The high-precision construction method for Qishi plate structure based on BIM grid positioning according to claim 1, characterized in that: In step S1, a precise structural model is imported into the BIM system. Relevant parameters are established based on the production drawings of the Qishi tube, clarifying the accuracy and range of the mesh division. A curtain wall mesh is drawn within the Qishi slab floor outline to achieve precise positioning. Specifically, a mesh adaptive optimization algorithm based on a genetic algorithm is used, with the objective function being the uniformity of the Qishi tube spacing and minimizing conflicts with beam reinforcement. The formula is as follows: in For the first The actual distance between each Qishi cylinder and its adjacent cylinder. To design the average spacing, To account for the amount of conflict with the beam reinforcement, , The optimal grid layout scheme is obtained through iterative calculation, using weighting coefficients. The accuracy of the mesh division is dynamically determined by a surface curvature algorithm based on point cloud data fitting. The mesh is automatically densified in areas with large curvature variations. With local curvature The relationship satisfies: in Based on density, This is the curvature sensitivity coefficient.

3. The high-precision construction method for Qishi plate structure based on BIM grid positioning according to claim 1, characterized in that: In step S2, the main keel uses H150*75*5*7 H-section steel, and the secondary keel uses 40*40 square steel. Adjustable top supports on the support frame are used to ensure that the top surfaces of each frame are on the same horizontal plane. A laser leveling instrument is used to correct the level, and the elevation is checked and verified to be controlled within 2mm. The adjustment process of the adjustable top supports incorporates a deflection pre-compensation model based on elasticity theory. Before adjustment, the predicted deflection value Δ is calculated, and pre-lift compensation is performed during the initial elevation setting. The pre-lift amount... This is to ensure that the elevation still meets the 2mm error requirement after loading.

4. The high-precision construction method for Qishi plate structure based on BIM grid positioning according to claim 1, characterized in that: In step S3, adjacent template edges are fixed flat with steel nails, and a denser measurement method is adopted to ensure that the bottom elevation is controlled before the non-removable Qishi board is laid. The dense measurement uses a template flatness fitting algorithm based on the least squares method. By collecting the elevation data of discrete points on the template surface, the best fitting plane is fitted, and the deviation of each measuring point from the plane is calculated. When there are three consecutive points | When the thickness exceeds 3mm, the system automatically identifies the area as requiring adjustment, guiding local leveling.

5. The high-precision construction method for Qishi plate structure based on BIM grid positioning according to claim 1, characterized in that: In step S4, the center point of the Qishi cylinder is laid out using BIM-based grid positioning and layout. A positioning base is installed at the intersection of the layout lines, with an error not exceeding 2mm. The positioning base has four pre-processed marking lines, which are aligned with the lines extending from the intersection. Screw holes are drilled sequentially according to the diagonal principle. The positioning base must not be displaced during the drilling process, and no screw holes should be missed or omitted. A real-time correction system based on machine vision is integrated into the layout process. When installing the positioning base, a camera captures the image of the base marking lines and the cross lines on the ground. The center point offset is calculated using an image recognition algorithm. If it is greater than 2mm, an audible and visual alarm is triggered, and a correction direction vector is displayed to guide the adjustment.

6. The high-precision construction method for Qishi plate structure based on BIM grid positioning according to claim 1, characterized in that: In step S5, the reinforcement binding of the ribbed beams should be carried out in stages and directions according to the main beams and secondary beams. First, the main beams around the perimeter should be completed, and then the reinforcement binding of the secondary beams in one direction should be started. The deviation should not be greater than 2mm. After the reinforcement binding is completed, the elevation should be checked. The rebar binding deviation control adopts an auxiliary positioning algorithm based on the combination of BIM and AR technologies. Construction workers view the virtual beam rebar positioning lines superimposed on the real scene through AR glasses, and the system calculates the deviation between the actual position of the rebar and the virtual positioning lines in real time. If the following conditions are met: in For virtual positioning line coordinates, These are the actual coordinates of the reinforcing bars.

7. The high-precision construction method for Qishi plate structure based on BIM grid positioning according to claim 1, characterized in that: In step S6, the installation sequence of the Qishi tube is as follows: bottom cover installation → tube body installation → screw installation → top cover installation → grout leakage prevention treatment → displacement prevention treatment. The screw installation involves screwing any end of the double-ended screw into the center screw hole of the bottom cover, then fitting the top cover in, and tightening the top screw to fix the Qishi tube body. The grout leakage prevention treatment involves sealing the gap between the upper end of the Qishi tube body and the edge of the top cover, as well as the screw hole location, with adhesive tape. The tape is applied evenly and firmly along the gap, around the entire circumference on both sides. The displacement prevention treatment involves using wooden blocks to top the Qishi tube, connecting and fixing the wooden blocks to the reinforcing beam with wire to prevent displacement of the Qishi tube during concrete pouring. After the top is completed, the elevation must be checked. The wooden blocks are removed sequentially according to the pouring direction during subsequent layered pouring.

8. The high-precision construction method for Qishi plate structure based on BIM grid positioning according to claim 7, characterized in that: In the aforementioned anti-displacement treatment, the fixing force F of the timber capping is verified using an anti-buoyancy calculation model based on fluid dynamics. The calculation formula is as follows: in For concrete density, It is the acceleration due to gravity. The volume of concrete displaced by the Gibbs pipe. The dynamic load factor is taken as 1.2~1.

5. This is an estimated value for the lateral dynamic pressure generated by the flow of concrete.

9. A high-precision construction method for a Qishi plate structure based on BIM grid positioning according to claim 1, characterized in that: In step S7, the concrete is poured in sections using isolation airbags. The height of the concrete poured in the same section does not exceed 350mm. After the lower layer of concrete is poured, the top cover of the Qishi cylinder ABS can be removed. The upper layer of concrete must be poured 5mm higher than the surface of the Qishi cylinder to prevent settlement and facilitate finishing and leveling. The layered pouring height within the same area is determined by an optimization formula based on the theory of concrete hydration heat conduction and initial setting time control. The optimal thickness of each layer is: in For the highest permissible core temperature, The temperature at which the mold is poured in. Thermal conductivity, The density of concrete, The heat yield per unit volume of hydration; optimize temperature control and construction efficiency while ensuring that the thickness does not exceed 350 mm.

Images