Construction method of double-curved special-shaped roof based on polycarbonate resistant plate

Abstract

The application provides a double-curved special-shaped roof construction method based on a polycarbonate resistant plate, a roof overall structure model is constructed through BIM; measured point cloud data of each component is obtained through three-dimensional laser scanning, the measured point cloud data is compared with a corresponding BIM model structure, a deviation chromatogram is generated and deviation and collision areas are identified; bidirectional curvature analysis is carried out on each resistant plate through the BIM model, and the resistant plate is divided into a hot forming processing area and a field cold bending processing area according to the analysis result; the BIM model is analyzed and divided into multiple assembly units, the center of gravity and the lifting point position of each assembly unit are analyzed and obtained through the BIM model; processing parameters of the BIM model are extracted and processing is carried out; a three-dimensional jig is erected, and pre-assembly is carried out on the three-dimensional jig; after the assembly units are respectively lifted and actually installed according to the lifting point position, waterproof treatment and acceptance are carried out.

Description

Technical Field

[0001] This invention relates to the field of hyperbolic irregular roof construction, and in particular to a construction method for hyperbolic irregular roofs based on polycarbonate solid sheets. Background Technology

[0002] With the increasing pursuit of aesthetic effects in large public buildings, hyperbolic irregular roofing systems have been widely used in landmark projects such as stadiums, convention centers, and cultural buildings. Polycarbonate (PC) endurance sheets, due to their excellent light transmittance, impact resistance, and plasticity, have become the ideal surface material for such roofing systems. However, the construction of hyperbolic irregular polycarbonate sheet roofs involves multiple technical aspects, including steel keel processing, polycarbonate sheet molding, component hoisting, and waterproofing, requiring extremely high levels of construction precision and craftsmanship.

[0003] Currently, for several technical aspects of hyperbolic polycarbonate (PCP) roof construction, steel keel processing typically involves cold bending or stretch bending equipment to perform single-curve bending on rectangular steel pipes. For hyperbolic shapes, a "straight line instead of curved line" or "single curve instead of hyperbolic line" approach is used, where multiple straight line segments or single-curve arc segments are spliced ​​together to fit the designed curved surface. After processing, the steel keel is transported to the construction site and assembled in disassembled parts at high altitude, forming a framework system through welding or bolting. However, the "straight line instead of curved line" or "single curve instead of hyperbolic line" processing method cannot accurately fit the hyperbolic shape, resulting in deviations between the steel keel and the designed curved surface. This deviation, transmitted to the aluminum profile installation stage, causes misalignment at the joints of aluminum profile segments, creating leakage channels. Simultaneously, high-altitude assembly of disassembled parts is inefficient, requiring workers to make multiple adjustments at height, making it difficult to guarantee the smoothness and consistency of the overall shape.

[0004] For the forming of hyperbolic polycarbonate sheets, existing technologies mainly employ the following two methods: Method 1: On-site cold bending process. Flat polycarbonate sheets are transported to the construction site, and during installation, they are bent and deformed by external force to fit against the already installed keel surface. Construction workers control the degree of bending based on experience and fix them with self-tapping screws or pressure plates. However, the on-site cold bending process cannot meet the forming requirements of large-curvature bidirectional bending sheets. The two bending directions of a hyperbolic sheet are opposite; bending one side increases the difficulty of bending the other side. During cold bending, defects such as springback, cracks, and surface stress concentration are prone to occur, and it is difficult to achieve a tight fit between the sheet and the aluminum profile, posing a risk of leakage. Method 2: Integral hot bending process. The polycarbonate sheet is placed in a heating chamber and heated to a softening temperature. After removal, it is bent into shape by gravity or a simple mold, and after cooling, a sheet with a certain curvature is obtained. However, the integral hot bending process cannot guarantee the precise curvature of each sheet. For hyperbolic shapes with complex surface variations, it is difficult to achieve precise fitting using a single mold or free forming. Furthermore, the overall hot bending process cannot differentiate between different curvatures, resulting in poor adhesion in some areas.

[0005] For component hoisting, roof frame hoisting typically involves assembling sections on the ground and then hoisting them as a whole. The steel keel is assembled into unit modules on the ground, with lifting points symmetrically arranged around the center of gravity. These modules are then lifted to the installation position using hoisting equipment, and their position is adjusted using chain hoists, jacks, or temporary supports after placement. However, existing hoisting techniques lack specific solutions for components with special orientations, such as inclined walls. When components are inclined and cannot be directly hoisted in their intended position, current technology usually employs a method of installing individual components at height on an aerial work platform. This method involves a large amount of work at height, high safety risks, low efficiency, and difficulty in controlling the accuracy of high-altitude assembly.

[0006] During installation, measurement and positioning are required. Currently, this is mainly done by using a total station for point-by-point layout. Based on the theoretical coordinates provided by the design drawings, the purlin installation positions are marked on the main structure. Construction deviations in the main structure are then compensated for using shims or on-site adjustments. Some projects use a total station in conjunction with a prism for coordinate verification during installation. However, this existing measurement and positioning method relies heavily on theoretical design coordinates and does not consider actual construction deviations in the main structure. When there are positioning errors in main structural components such as the main purlin tubes, subsequent keel positioning and purlin cutting lack precise basis, leading to accumulated deviations, large on-site adjustments, and difficulty in guaranteeing installation accuracy. Furthermore, data from the design, fabrication, measurement, and installation stages are not interconnected, lacking a closed-loop feedback mechanism.

[0007] Furthermore, due to the accumulation of problems such as insufficient processing precision of steel keel, poor adhesion of polycarbonate sheets, and misalignment of aluminum profiles, the waterproofing reliability of hyperbolic polycarbonate sheet roofs is difficult to guarantee. Existing technology mainly relies on on-site sealant treatment, which requires high precision in the treatment of details at joints. If the construction quality is not properly controlled, leakage problems are very likely to occur, and subsequent repairs are difficult. Summary of the Invention

[0008] To address the problems existing in the background art, this invention proposes a construction method for hyperbolic irregular roofs based on polycarbonate endurance boards.

[0009] A construction method for hyperbolic irregular roofs based on polycarbonate solid sheets includes the following steps:

[0010] S100. Construct an overall structural model of the roof using BIM;

[0011] S200. Obtain the measured point cloud data of each component through three-dimensional laser scanning, compare the measured point cloud data with the corresponding BIM model structure, generate a deviation chromatogram, and identify deviation and collision areas.

[0012] S300. Perform bidirectional curvature analysis on each polycarbonate sheet using a BIM model, and divide the polycarbonate sheet into a thermoforming processing area and an on-site cold bending processing area based on the analysis results.

[0013] S400: Analyze and divide the assembly unit into multiple assembly units using the BIM model; analyze and obtain the center of gravity and lifting point position of each assembly unit using the BIM model; extract the processing parameters of the BIM model and perform processing.

[0014] S500: Erect a three-dimensional jig and pre-assemble on the three-dimensional jig;

[0015] S600. After hoisting and installing the assembly units according to the lifting point locations, waterproofing treatment and acceptance are carried out.

[0016] Based on the above, in step S600, for wall blocks that are tilted in the opposite direction, the frame of the wall block is first lifted vertically and the top is brought close to the target point, and then the bottom is pulled into place.

[0017] Based on the above, in step S600, the waterproofing treatment includes: setting EPDM adhesive strips on the aluminum alloy base after installation, and sealing the corners at a 45° angle; cleaning each break point and joint with a cleaning agent and then filling and sealing it with neutral silicone weather-resistant sealant.

[0018] Based on the above, in step S100, the BIM model includes a steel round tube main keel, a steel square tube support, a fine steel keel, an aluminum alloy base, an aluminum alloy pressure plate, an aluminum alloy buckle cover, and an 8mm thick endurance plate.

[0019] Based on the above, in step S300, the area with an arch height / chord length ratio of 0.015 is divided into a thermoforming processing area, and the area with a ratio of less than or equal to 0.015 is divided into an on-site cold bending processing area.

[0020] Based on the above, in step S600, after the roof and wall are installed, a 2-hour continuous water spray test is conducted. If there is no leakage, the quality is deemed to be qualified.

[0021] This invention has outstanding substantive features and significant progress compared to the prior art, specifically:

[0022] (1) Fully digital collaborative design and reverse correction based on BIM + 3D scanning:

[0023] A refined BIM model including steel keel, aluminum profiles and polycarbonate sheets was established, and two-way curvature analysis was carried out. The area of ​​hot-formed sheet and cold-formed sheet on site was scientifically divided with the ratio of arch height to chord length of 0.015 as a quantitative index, which changed the traditional extensive mode that relied on experience judgment.

[0024] A 3D laser scanner was used to conduct on-site measurements of the main steel structure. A point cloud model was established and compared with the BIM theoretical model to generate a deviation chromatogram.

[0025] Optimize the purlin positioning coordinates based on the measured deviations and perform CNC cutting to form a data closed loop of "design → processing → measurement → correction → installation", effectively absorbing the construction deviations of the main structure;

[0026] (2) Combined processing of hyperbolic irregular components by "thermoforming + cold bending + three-dimensional jig pre-assembly":

[0027] High-precision machining of steel keel: The steel keel is bent and twisted using medium-frequency hot bending equipment. After machining, it is 100% pre-assembled on a three-dimensional jig. The jig coordinates are directly taken from the BIM model. The misalignment of the joint is controlled within 0.5mm, and the port coordinate deviation is ≤±2mm.

[0028] Aluminum profile matching and processing: The aluminum profiles are bent and twisted before aging treatment, and are also inspected by a three-dimensional jig to accurately match the steel keel;

[0029] Differentiated forming of polycarbonate sheets: In the thermoforming zone, CNC engraving of yin and yang molds is performed based on BIM model data. After pre-drying and infrared heating, the sheets are vacuum-formed and then cooled and shaped before fine trimming. In the cold bending zone, the sheets are precisely cut according to the unfolded drawing, with the bending direction and radius marked. This achieves precise forming of large-curvature bidirectional bending sheets.

[0030] (3) Modular hoisting of complex spatial posture unit “vertical lifting + winch traction positioning”: The roof is divided into several assembly units. After the keel assembly and aluminum alloy base installation are completed on the ground frame, the whole unit is hoisted. The hoisting point is optimized by finite element analysis. The hoisting deformation is ≤L / 300 and ≤20mm.

[0031] For the anti-sloping wall unit, an innovative "vertical lifting + winch traction positioning" process is adopted: the top row of purlin brackets is pre-welded to the bottom of the keel for auxiliary positioning. When lifting, the wall frame is first lifted vertically, with the top close to the target point of the main structure. The winch is used to slowly pull the bottom inward into position. After fine adjustment, the remaining purlin brackets are installed.

[0032] This technology solves the problem of large-angle anti-sloping components not being able to be directly positioned and hoisted, reducing high-altitude work by 60% and significantly improving construction safety and installation accuracy;

[0033] (4) Multi-layer waterproof structure: The steel keel is processed according to the theoretical dimensions of the model, fundamentally avoiding the leakage hazards caused by the misalignment of aluminum profile sections due to the substitution of single-curve for double-curve; the joints of the aluminum alloy base are sealed with sealant, and gaps are opened at the intersections of the horizontal and vertical sections to allow the water channel to be connected, forming a continuous drainage system; EPDM rubber strips are continuously installed, with 45° bevel joints at the corners, and the joints are treated with sealant to ensure continuous sealing; all sealants are neutral silicone weather-resistant adhesives, and neutral cleaning agents are used for surface cleaning to avoid corrosion of the polycarbonate sheet by acidic or alkaline materials; a multi-layer waterproof structure system of "precise fitting of steel keel + water channeling of aluminum profile + continuous sealing of rubber strips + protection of neutral materials" is formed, with a 100% pass rate in the water spray test. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a flowchart illustrating the process of this invention.

[0036] Figure 2 This is a schematic diagram of the BIM model of this invention.

[0037] Figure 3 This is a schematic diagram of a portion of the roof in the BIM model of this invention.

[0038] Figure 4 This is a schematic diagram showing the roof of the present invention divided into multiple assembly units.

[0039] Figure 5 This is a schematic diagram of the center of gravity and lifting point of an assembly unit of the present invention.

[0040] Figure 6 This is a schematic diagram of the overall vertical lifting of the present invention. Detailed Implementation

[0041] 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.

[0042] like Figure 1As shown, a construction method for a hyperbolic irregular roof based on polycarbonate solid sheets includes the following steps: S100, constructing an overall roof structure model using BIM; S200, acquiring measured point cloud data of each component using 3D laser scanning, comparing the measured point cloud data with the corresponding BIM model structure, generating a deviation chromatogram, and identifying deviation and collision areas; S300, performing bidirectional curvature analysis on each solid sheet using the BIM model, and dividing the solid sheet into a thermoforming processing area and an on-site cold bending processing area based on the analysis results; S400, analyzing and dividing the solid sheet into multiple assembly units using the BIM model, analyzing and acquiring the center of gravity and lifting point positions of each assembly unit using the BIM model; extracting processing parameters from the BIM model and performing processing; S500, erecting a 3D jig and pre-assembling on the 3D jig; S600, after lifting and actually installing the assembly units according to the lifting point positions, performing waterproofing treatment and acceptance.

[0043] Specifically:

[0044] This technical solution is applicable to the construction of hyperbolic polycarbonate solid sheet roofing systems for stadiums, convention centers, and similar large public buildings. The main components involved in the construction include:

[0045] (1) Main supporting components: Φ194×8mm (pipe diameter and thickness) steel round pipe main keel, and □200×100×5mm (pipe length, width and thickness) and □150×100×5mm steel square pipe supports;

[0046] (2) Refined steel keel: □100×100×4mm right angle steel square tube, which is bent and twisted according to the BIM model parameters by medium frequency hot bending equipment;

[0047] (3) Aluminum alloy structural components: aluminum alloy base, aluminum alloy pressure plate, aluminum alloy buckle cover, aluminum profiles are bent and twisted before aging treatment and matched with the three-dimensional jig of steel keel for inspection.

[0048] (4) Surface sheet: 8mm thick polycarbonate endurance board, divided into thermoforming zone sheet and on-site cold bending zone sheet according to bidirectional curvature;

[0049] (5) Sealing and isolation materials: EPDM rubber strip, 3mm thick butyl tape, insulating rubber pad, neutral silicone weather-resistant sealant;

[0050] (6) Digital control data: BIM detailed model, three-dimensional scanning point cloud model, deviation chromatogram, component processing parameters, purlin connection point coordinates and hoisting block model.

[0051] Connection relationships and installation locations of various components

[0052] (1) Φ194×8mm steel round tube main keel serves as the main support foundation of the roof system, and □200×100×5mm or □150×100×5mm steel square tube support is CNC cut and installed according to the connection point coordinates after three-dimensional scanning correction.

[0053] (2) □ 100×100×4mm fine steel keel is installed above the support. The bending radius, arch height, arc length, chord length, relative torsion angle at both ends and port coordinates of the steel keel are all extracted from the BIM model.

[0054] (3) First, an insulating rubber pad is installed on the upper surface of the steel keel, and then the aluminum alloy base is installed by self-tapping screws. The water channel is made to be connected by cutting notches or drilling holes at the intersection of the base.

[0055] (4) The polycarbonate endurance board is installed on top of the aluminum alloy base, and EPDM rubber strips and butyl tape are set between the board and the base and pressure plate to form an elastic seal;

[0056] (5) The aluminum alloy pressure plate is connected to the base by stainless steel machine screws, and finally the aluminum alloy buckle is snapped in.

[0057] (6) Neutral silicone weather-resistant sealant is used to seal the broken parts of the aluminum profile, the broken parts of the rubber strip, and the joints of the base to form a continuous waterproof node.

[0058] The roles of each component or assembly in the technical solution are as follows:

[0059] (1) The BIM model is used for unified design, detailing, curvature analysis, processing parameter extraction, hoisting simulation and installation verification, and is the data source of this method;

[0060] (2) The three-dimensional scanning point cloud model is used to obtain the measured deviation of the main steel structure, the positioning coordinate correction of the support purlin, and the adjustment of the collision area;

[0061] (3) The main steel round tube keel and the steel square tube support bear the main force transmission and connection positioning functions of the roof system;

[0062] (4) The fine steel keel serves as the control point for the hyperbolic curved surface, the reference point for the installation of aluminum profiles, and the support point for the polycarbonate sheet;

[0063] (5) The aluminum alloy base, pressure plate, and buckle cover together form a mechanical fixing, pressing and sealing and drainage system for the polycarbonate sheet;

[0064] (6) Polycarbonate sheets are used as the roof cladding layer for light transmission and are bonded to the curved surface of the hyperbolic keel by thermoforming or cold bending.

[0065] (7) EPDM rubber strips, butyl tapes, insulating rubber pads and neutral silicone weather-resistant sealant respectively serve as elastic seals, joint waterproofing, metal isolation and joint sealing;

[0066] (8) The three-dimensional jig is used for pre-assembly inspection, port finishing and aluminum profile matching verification;

[0067] (9) Winches, chains, and traction ropes are used for the attitude conversion, traction positioning, and spatial fine adjustment of the anti-sloping wall unit.

[0068] The working principle and process of this embodiment are as follows:

[0069] The first step is to create a BIM model, such as... Figure 2 As shown, a complete model is created, including the main steel round tube keel, steel square tube support, fine steel keel, aluminum alloy base, aluminum alloy pressure plate, aluminum alloy buckle cover, and 8mm thick polycarbonate sheet.

[0070] The second step involves 3D scanning and reverse correction. After the main steel structure is installed, a 3D laser scanner is used to perform a comprehensive scan of the main keel and the main structure to obtain on-site measured point cloud data (in reality, the main steel structure is already completed; this embodiment only covers the roof construction and hoisting. Therefore, the scanning stage is performed after the main steel structure construction is completed and the purlins are installed, providing on-site data for the refined steel keel. The purpose is to eliminate errors in the construction stages of the steel structure and purlins by adjusting the purlin support length and angle between the refined steel keel and the purlins, ensuring the final implementation effect of the polycarbonate endurance board); the point cloud model is compared with the BIM theoretical model to generate a deviation chromatogram, identify deviations and collision areas in the main structure, and optimize the positioning coordinates of the refined steel keel and the purlin connection point coordinates accordingly.

[0071] The third step is to perform curvature zoning of the polycarbonate sheets. Using the BIM model, a two-way curvature analysis is performed on each polycarbonate sheet. Based on the arch height / chord length ratio of 0.015, areas greater than 0.015 are divided into thermoforming processing areas, and areas less than or equal to 0.015 are divided into on-site cold bending processing areas. The critical sheet material is zoned in the final form by the first piece cold bending test.

[0072] The fourth step is to extract processing parameters and perform factory processing. This involves extracting bending and twisting parameters of the steel keel, spatial lines of the aluminum profile, unfolded dimensions of the polycarbonate sheet or mold point cloud data, and coordinates of purlin connection points from the BIM model. The steel keel is bent and twisted using a medium-frequency hot bending machine, with a 250-300mm allowance at both ends, and the forming accuracy is controlled within ±2mm. The aluminum profile undergoes bending and twisting before aging treatment. In the hot forming area, the polycarbonate sheet is formed using CNC engraving of male and female molds, pre-drying, infrared heating, vacuum adsorption forming, cooling and shaping, and fine trimming. In the cold bending area, the polycarbonate sheet is cut according to the unfolded drawing and the bending direction and radius are marked.

[0073] The fifth step is to pre-assemble the 3D formwork. The 3D formwork is erected according to the BIM model coordinates. A total station is used to locate the formwork control points, with a coordinate deviation of ≤±2mm. The steel keel is 100% pre-assembled on the formwork, with the misalignment controlled within 0.5mm. The ends are precisely cut according to the coordinate lines. The aluminum profiles and steel keel are matched and inspected on the formwork.

[0074] Step 6: Modular assembly and overall hoisting. Based on the hoisting equipment capacity, transportation conditions, and structural characteristics, the assembly is divided into units, and the weight, center of gravity, and hoisting point locations are calculated. Figure 3 , Figure 4 and Figure 5 As shown; the roof unit is hoisted as a whole after the keel assembly and aluminum alloy base installation are completed on the ground frame; a trial hoisting is conducted before hoisting to check the tension of the slings, the posture of the components and the settlement of the outriggers.

[0075] Step 7: Special hoisting of the reverse-sloping wall, such as... Figure 6 As shown. For wall sections that are tilted in the opposite direction, the "vertical lifting + winch traction positioning" process is adopted. The top row of purlin brackets is pre-welded to the bottom of the keel for auxiliary positioning. First, the wall frame is vertically lifted and the top is brought close to the target point. Then, the bottom is pulled inward by the winch and the remaining purlin brackets are installed after fine adjustment with the help of the chain hoist.

[0076] Step 8: Panel Installation and Waterproofing. After the aluminum alloy base is installed, install EPDM adhesive strips, and seal the corners at a 45° angle. After the polycarbonate sheet is in place, install the pressure plate and cover. Treat all disconnected and jointed areas with neutral silicone weather-resistant sealant, and use neutral soapy water or anhydrous alcohol as the cleaning agent.

[0077] Step 9, Quality Acceptance. After the roof and wall installation is completed, a 2-hour continuous water spray test is conducted. No leakage is considered acceptable, and acceptance is carried out in accordance with GB50205-2020 and GB50207-2012.

[0078] Application example:

[0079] The construction of a hyperbolic polycarbonate solid sheet roof for a stadium will be used as an example for illustration:

[0080] In the polycarbonate sheet system for the hyperbolic roof and walls of a stadium, a detailed BIM model was first established, including the main steel round tube keel, steel square tube support, fine steel keel, aluminum profile and 8mm thick polycarbonate sheet. After the main structure was completed, a 3D laser scanner was used to obtain point cloud data, which was compared with the theoretical model. The coordinates of the purlin connection points were adjusted according to the measured deviation and CNC cutting was performed.

[0081] During construction, the polycarbonate sheet is divided into a thermoforming zone and a cold bending zone based on an arch height / chord length ratio of 0.015. The thermoformed sheet is CNC-carved with male and female molds according to model data, and then pre-dried, infrared heated, vacuum adsorbed, cooled and shaped, and finely trimmed to form a hyperbolic sheet; the cold-bent sheet is precisely cut according to the unfolded drawing and the bending direction is marked.

[0082] The steel keel is bent and twisted according to BIM parameters using a medium-frequency hot bending machine, and 100% pre-assembled on a three-dimensional jig. The port coordinate deviation is controlled within ±2mm, and the misalignment at the butt joint is controlled within 0.5mm. The aluminum profiles are bent and twisted before aging treatment, and their matching with the steel keel is inspected.

[0083] After the roof sections are assembled on the ground frame, the welds are ground and the aluminum alloy bases are installed, they are hoisted as a whole. The anti-sloping wall sections adopt the "vertical hoisting + winch traction positioning" process. First, they are hoisted vertically, then the bottom is pulled inward to position, and finally the remaining purlin brackets are installed by fine adjustment and completion of the chain hoist.

[0084] After installation, the polycarbonate sheet roof forms a layered structure consisting of aluminum alloy snap-on covers, aluminum alloy pressure plates and EPDM rubber strips, butyl tape, 8mm thick polycarbonate sheets, aluminum alloy bases and EPDM rubber strips, insulating rubber pads, refined steel keel, steel square tube supports, and steel round tube main keel. The roof and walls underwent a 2-hour continuous water spray test with no leakage, meeting the construction precision, safety, and waterproofing requirements for hyperbolic shaped polycarbonate sheet roofs.

[0085] The advantages of this invention are:

[0086] (1) Shift from experience-based control to digital control, and integrate design, processing, calibration and installation through BIM model, point cloud model and deviation chromatogram;

[0087] (2) The hot forming and cold bending areas are divided by the arch height / chord length ratio of 0.015, so that the forming method of polycarbonate sheet has a quantitative basis;

[0088] (3) By using medium-frequency hot bending, aluminum profile pre-aging bending and torsion, and 100% pre-assembly of three-dimensional jig, the processing error of hyperbolic components and the amount of on-site repair are reduced;

[0089] (4) Modular ground assembly and overall hoisting reduce high-altitude bulk operations, improving construction safety and efficiency;

[0090] (5) The problem of the inability to directly hoist the anti-sloping wall unit in the positioning posture is solved by "vertical hoisting + winch traction positioning";

[0091] (6) Improve the reliability of waterproofing of hyperbolic polycarbonate roof by precisely fitting steel keel, guiding water through aluminum profile, continuous sealing with rubber strips and protection with neutral materials.

[0092] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A construction method for hyperbolic irregular roofs based on polycarbonate solid sheets, characterized in that, Including the following steps: S100. Construct an overall structural model of the roof using BIM; S200. Obtain the measured point cloud data of each component through three-dimensional laser scanning, compare the measured point cloud data with the corresponding BIM model structure, generate a deviation chromatogram, and identify deviation and collision areas. S300. Perform bidirectional curvature analysis on each polycarbonate sheet using a BIM model, and divide the polycarbonate sheet into a thermoforming processing area and an on-site cold bending processing area based on the analysis results. S400: Extract the processing parameters of the BIM model and perform processing; S500: Erect a three-dimensional jig and pre-assemble on the three-dimensional jig; S600: Analyze and divide the assembly unit into multiple assembly units using the BIM model. Analyze and obtain the center of gravity and lifting point position of each assembly unit using the BIM model. After lifting and actually installing the assembly unit according to the lifting point position, perform waterproofing treatment and acceptance.

2. The construction method for hyperbolic irregular roofs based on polycarbonate solid sheets according to claim 1, characterized in that: In step S600, for wall sections that are tilted in the opposite direction, the frame of the wall section is first lifted vertically and the top is brought close to the target point, and then the bottom is pulled into place.

3. The construction method for hyperbolic irregular roofs based on polycarbonate solid sheets according to claim 2, characterized in that: In step S600, the waterproofing treatment includes: applying EPDM adhesive strips to the aluminum alloy base after installation, and sealing the corners at a 45° angle; cleaning each break point and joint with a cleaning agent and then filling and sealing it with neutral silicone weather-resistant sealant.

4. The construction method for hyperbolic irregular roofs based on polycarbonate solid sheets according to claim 1, characterized in that: In step S100, the BIM model includes a steel round tube main keel, a steel square tube support, a fine steel keel, an aluminum alloy base, an aluminum alloy pressure plate, an aluminum alloy buckle cover, and an 8mm thick endurance plate.

5. The construction method for hyperbolic irregular roofs based on polycarbonate solid sheets according to claim 1, characterized in that: In step S300, based on the arch height / chord length ratio of 0.015, the area greater than 0.015 is divided into the thermoforming processing area, and the area less than or equal to 0.015 is divided into the on-site cold bending processing area.

6. The construction method for hyperbolic irregular roofs based on polycarbonate solid sheets according to claim 1, characterized in that: In step S600, after the roof and wall installation is completed, a 2-hour continuous water spray test is conducted. If there is no leakage, the quality is deemed to be qualified.

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