Construction method and structure of special-shaped curved steel membrane structure canopy

Abstract

The application belongs to the technical field of steel structure building, and particularly discloses a construction method and structure of a special-shaped curved steel membrane structure canopy. The method comprises the following steps: pouring a concrete foundation, manufacturing special-shaped curved template plates, and manufacturing a special-shaped curved steel frame structure according to the template plates, wherein the special-shaped curved steel frame structure comprises a main body steel structure outer frame and a main steel structure inner steel structure frame; the main body steel structure outer frame is connected with a screw base in a hoisting positioning mode, and then the main steel structure inner steel structure frame is welded with the main body steel structure outer frame one by one to form a shape; T-shaped steel for installing membrane steel is welded on the main body steel structure outer frame and the main steel structure inner steel structure frame along the perpendicular line of the special-shaped curved surface to form a membrane structure frame fixed on the main body steel structure outer frame; membrane units are prepared according to the membrane structure frame, and corresponding membrane units are installed on the membrane structure frame one by one. The application has high construction efficiency, short construction period and high precision.

Description

Technical Field

[0001] This invention belongs to the field of steel structure construction, and more specifically, relates to a construction method and structure of an irregular curved steel membrane structure canopy. Background Technology

[0002] In recent years, with the development of urban economy and culture, people's requirements for bridge landscape have gradually increased, and steel structure bridges are becoming more and more common. Steel structure bridges are widely used due to their versatility. In particular, corresponding canopies are often installed in the construction of steel structure bridges to meet their functional requirements. Ordinary canopies have simple designs and poor landscape effects. Ordinary canopies are mostly welded to the main bridge, often resulting in a square shape with poor landscape effect. Moreover, many canopy roofs use glass materials, which are not innovative enough and difficult to maintain. Therefore, it is necessary to conduct research on a new construction technology for steel membrane structure canopies. This invention provides an irregular curved steel membrane structure canopy for steel structure landscape bridges, which is suitable for steel structure bridges with certain curvature and large length. By setting up a separate independent foundation, while meeting the rain protection and lighting functions of the canopy, it adopts a light steel structure combined with ETFE membrane structure material for construction. The construction process is optimized to ensure construction safety, achieve green environmental protection and avoid material waste, and has good application prospects.

[0003] Chinese patent CN111424821A discloses a prestressed tensioned membrane structure with a sloping arch frame, comprising a bottom steel structure support and several sets of top frame structures. A gap is provided between adjacent top frame structures. Each top frame structure includes two symmetrically inclined arch ribs leaning towards the center and several connecting beams between the two arch ribs. Tensioned membrane is laid on the top surface of the top frame structures. A transverse top surface tie is provided above the tensioned membrane between adjacent sets of top frame structures, with two branch chain tie at each end of the transverse top surface tie. This structure mainly addresses the technical problems of existing steel structures, such as high corrosion prevention costs, low space utilization, high demolition costs, unsuitability for membrane installation, and structural instability. However, it fails to demonstrate node control during the construction of irregularly shaped curved steel membrane structures. Chinese patent CN114961280A discloses a construction method for installing air-cushion membrane structures in steel structures. This method, which includes the installation of membrane structure supports and subsequent acceptance procedures, ensures the stable installation of the air-cushion membrane on the steel structure while guaranteeing worker safety and protecting the membrane. The construction method is clearly defined and ensures the orderly installation of the air-cushion membrane. However, this method does not consider the construction issues under tension membrane construction conditions.

[0004] Based on the aforementioned defects and shortcomings, there is an urgent need in this field to propose a construction method for irregular curved steel membrane structure canopies, adopt the optimal process for construction, making it safer and more convenient to construct, using steel structure construction to highlight the advantages of green and environmental protection, and using novel tensile membrane structure construction to meet lighting requirements and provide better landscape effects. Summary of the Invention

[0005] To address the aforementioned deficiencies or improvement needs of existing technologies, this invention provides a construction method and structure for an irregularly shaped curved steel membrane structure canopy. The method involves setting up a canopy foundation with pre-embedded bolt bases and pre-drilled bolt holes in the prefabricated main steel frame. After hoisting the main frame as a whole, high-strength bolts are used for tight connection, effectively assembling and connecting the concrete foundation and the main steel structure. Some concealed areas are protected by concrete encapsulation to effectively prevent oxidation. Subsequently, circular steel pipes of a certain curvature are welded one by one to form the main steel structure, creating the overall frame. Each cylindrical steel pipe is welded with a "T"-shaped perforated membrane steel structure frame. During construction, the weld fullness is ensured to meet strength requirements. Finally, membrane units with pre-drilled holes are tensioned and installed. After installation, water tightness is checked, and the bolt locations are touched up with paint to prevent oxidation. The final result is an irregularly shaped curved steel membrane structure canopy. The canopy provides a certain aesthetic appeal, and the use of lightweight steel and membrane structures highlights green environmental protection. The optimized construction process increases construction efficiency and shortens the construction period, which is of great significance for steel structure bridge construction projects.

[0006] To achieve the above objectives, according to one aspect of the present invention, a construction method for an irregularly shaped curved steel membrane structure canopy is proposed, comprising the following steps:

[0007] Step 1: Pour the concrete foundation, during which a base with bolts is pre-embedded.

[0008] Step 2: Fabricate irregular curved surface template plates and fabricate irregular curved surface steel frame structures based on the template plates. The irregular curved surface steel frame structure includes the main steel structure outer frame and the main steel structure internal steel structure frame.

[0009] Step 3: Connect the outer frame of the main steel structure to the base with screw rods by hoisting and positioning. Then, weld the inner steel frame of the main steel structure to the outer frame of the main steel structure one by one.

[0010] Step 4: Weld T-shaped steel for installing the membrane steel along the vertical line of the irregular curved surface on the outer frame of the main steel structure and the inner steel structure frame of the main steel structure to form a membrane structure frame fixed to the outer frame of the main steel structure.

[0011] Step 5: Prepare membrane units according to the membrane structure framework, and install the corresponding membrane units one by one onto the membrane structure framework.

[0012] As a further preferred option, in step one, a three-dimensional model of the irregular curved steel membrane structure canopy is constructed according to the design parameters, and the weight information of the irregular curved steel membrane structure canopy is estimated based on the three-dimensional model. Based on the weight information, the volume and depth of the concrete foundation and the strength of the pre-embedded screw base are designed.

[0013] As a further preferred embodiment, step two, the fabrication of the irregular curved surface template sheet, includes the following steps:

[0014] (21) Based on the three-dimensional model of the irregular curved steel membrane structure canopy, the curvature of the outer surface of the irregular curved steel membrane structure canopy is analyzed. Based on the analysis results, the steel column part of the irregular curved steel frame structure is divided into segments to generate multiple steel column segments.

[0015] (22) Based on the column space curved surface shape of the steel column segment and the size of the template plate, template joints are made on the template plate to generate an irregular curved surface steel frame structure model with template joints.

[0016] (23) Based on the irregular curved surface steel frame structure model of steel column segments and template joints, extract the geometric data of the grid surface of the outer surface of the steel column, determine the spatial geometry and outer contour size of the template plate, and carry out three-dimensional digital design of the template plate for each steel column segment.

[0017] (24) The template panels are assembled in batches according to the construction segments, and the number of template panels and joints is counted. The template panels are projected, cut and three-dimensional perspective is performed using BIM technology to generate template panel construction drawings and processing drawings, and irregular curved surface template panels are prepared.

[0018] As a further preferred embodiment, step two, the fabrication of the irregular curved surface template sheet, further includes setting a model to minimize the material consumption of the template sheet, and calculating the minimum amount of material used for the template sheet. The model to minimize the material consumption of the template sheet is as follows:

[0019]

[0020] Where G is the minimum amount of material used in the template sheet, C′ is the material density, and H(T) i T represents the thickness of the i-th template plate. i Let be the i-th template piece, n be the number of template pieces, and A be the surface area of ​​the i-th template piece.

[0021] As a further preferred option, step four specifically includes the following steps:

[0022] (41) The outer surface of the irregular curved steel membrane structure canopy is translated by a specified displacement along its vertical direction. The two ends of the steel column segment are projected onto the translated curved surface. The three-dimensional coordinates of each projection point are obtained. The curve where the steel column segment is located is used as the first lofting curve. The projection points of the steel column segment on the same curve are fitted to obtain the second lofting curve.

[0023] (42) Construct a T-shaped steel lofting surface based on the first lofting curve and its corresponding second lofting curve, and perform lofting processing on the T-shaped steel based on the lofting surface;

[0024] (43) Weld T-shaped steels after layout treatment on the outer frame of the main steel structure and the inner frame of the main steel structure, so that the T-shaped steels are perpendicular to the corresponding outer frame of the main steel structure and the inner frame of the main steel structure, that is, the curved surface of the outer surface of the T-shaped steel panel is parallel to the curved surface of the outer surface of the irregular curved steel membrane structure canopy, so as to form a membrane structure frame fixed on the outer frame of the main steel structure.

[0025] As a further preferred embodiment, step five specifically includes the following steps:

[0026] Based on the membrane structure frame, membrane units are designed one by one. The positioning points of the membrane units are aligned with the boundaries of the membrane auxiliary frame. The membrane units are then pulled to the installation position. During installation, aluminum alloy edge clamps are used to fix the position and provide protection. The short sides are installed and tensioned symmetrically first. Then, the membrane accessories and bolts are installed from the middle to both sides in sequence. Finally, the long side bolts are installed and tensioning is completed. Other membrane units are installed in sequence.

[0027] As a further preferred embodiment, step five also includes:

[0028] When installing the short side bolts of the membrane unit, the membrane unit is gradually tensioned and flattened by tightening the bolts and pressing the aluminum alloy clamps. When installing and tensioning the membrane unit, start from the center point of the long side and gradually install and tension towards both ends. After the bolts are tightened and the membrane is flat, it is tensioned and installed in place. After all membrane units are installed, check the degree of tension and unfolding of the membrane material to ensure that it meets the original design requirements.

[0029] As a further preferred option, the exposed steel structure and bolts are also painted.

[0030] According to another aspect of the present invention, an irregular curved steel membrane structure canopy is also provided, which is manufactured using the method described in any of the embodiments above, comprising:

[0031] A concrete foundation, in which a base with a screw rod is pre-embedded;

[0032] An irregular curved steel frame structure is provided on the concrete foundation and is fixedly connected to the concrete foundation through the base with screws. The irregular curved steel frame structure includes an outer frame of the main steel structure and an inner frame of the main steel structure.

[0033] A membrane structure frame is provided along the outer surface of the irregular curved steel frame structure;

[0034] The membrane unit is fixedly embedded within the membrane structure frame so that the membrane unit and the membrane structure frame together form a sealed structure.

[0035] As a further preferred embodiment, the membrane structure frame includes T-shaped steel and edge strips arranged perpendicularly to the outer frame of the main steel structure or the inner frame of the main steel structure. The T-shaped steel and edge strips are connected by bolts to fix the membrane unit between the T-shaped steel and the edge strips.

[0036] In summary, compared with the prior art, the above-described technical solutions conceived by this invention mainly possess the following technical advantages:

[0037] 1. This invention adopts a bottom-up construction sequence and the optimal process for construction, making it safer and more convenient. It uses steel structure construction, highlighting the advantages of green and environmental protection. It uses a novel tensile membrane structure construction to meet lighting requirements and provide better landscape effects, which is of great significance to steel structure bridge construction projects.

[0038] 2. This invention utilizes a pre-embedded bolt base in the canopy foundation, along with pre-drilled bolt holes in the prefabricated main steel frame. After hoisting the main frame as a whole, high-strength bolts are used for tight connection, effectively assembling and connecting the concrete foundation and the main steel structure. Some concealed areas are protected by concrete encapsulation to effectively prevent oxidation. Subsequently, circular steel pipes of a certain curvature are welded one by one to form the main steel structure, creating the overall frame. Each cylindrical steel pipe is welded with a "T"-shaped perforated membrane steel structure frame. During construction, the weld fullness is ensured to meet strength requirements. Finally, membrane units with pre-drilled holes are tensioned and installed. After installation, water tightness is checked, and the bolt locations are touched up with paint to prevent oxidation. The final result is an irregularly shaped curved steel membrane structure canopy. The canopy provides a certain aesthetic appeal. The use of light steel and membrane structures highlights green environmental protection. Optimized construction processes increase construction efficiency and shorten the construction period, making it significant for steel structure bridge construction projects.

[0039] 3. This invention utilizes 3D modeling technology, taking a precise model of an irregularly shaped curved steel membrane structure as a benchmark, to perform 3D digital precision design of the irregularly shaped curved steel membrane structure template. This not only efficiently solves the design problem of spatial curved templates for highly irregularly shaped steel membrane structures, but also maximizes the reusability of template panels, ensuring the construction accuracy of the tower's appearance, and improving the system's versatility, safety, and construction quality. Attached Figure Description

[0040] Figure 1 This is a flowchart illustrating a construction method for an irregularly shaped curved steel membrane structure canopy according to a preferred embodiment of the present invention.

[0041] Figure 2 This is a structural schematic diagram of an irregular curved steel membrane structure canopy according to a preferred embodiment of the present invention;

[0042] Figure 3 yes Figure 2 A schematic diagram of the structure with a screw base involved in the process;

[0043] Figure 4 yes Figure 2 A schematic diagram of some of the membrane structure frameworks involved;

[0044] Figure 5 yes Figure 2 The structural diagram of the T-shaped steel involved.

[0045] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1-concrete foundation, 2-irregular curved steel frame structure, 21-outer frame of main steel structure, 22-inner steel frame of main steel structure, 3-base with screw, 4-membrane structure frame, 5-membrane unit, 6-edge strip, 7-T-shaped steel. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0047] like Figures 1 to 5 As shown in the figure, the present invention provides a construction method for an irregularly shaped curved steel membrane structure canopy. This method involves setting up a canopy foundation with pre-embedded bolt bases and pre-reserved bolt holes in the prefabricated main steel frame. After hoisting the main frame as a whole, high-strength bolts are used for tight connection, effectively assembling and connecting the concrete foundation and the main steel structure. Some concealed areas are protected by concrete encapsulation to effectively prevent oxidation. Subsequently, circular steel pipes of a certain curvature are welded one by one to form the main steel structure, creating the overall frame. Each cylindrical steel pipe is welded with a "T"-shaped perforated membrane steel structure frame. During construction, the weld fullness is ensured to meet strength requirements. Finally, membrane units with pre-reserved holes are tensioned and installed. After installation, the water tightness is checked, and the bolt positions are touched up with paint to prevent oxidation. The final result is an irregularly shaped curved steel membrane structure canopy. The canopy has a certain aesthetic appeal, and the use of light steel and membrane structure construction highlights green environmental protection. Optimized construction technology increases construction efficiency to a certain extent and shortens the construction period, which is of great significance for steel structure bridge construction projects. The method includes the following steps:

[0048] Step 1: Pour the concrete foundation, and during the pouring process, pre-embed the base with screw rods.

[0049] In this step, the concrete foundation is constructed based on the planned self-weight of the steel membrane structure canopy. Special attention is paid to the pre-embedded reinforcing bars and bolt bases during concrete foundation construction, and the next construction step can only proceed after the foundation meets strength requirements. Specifically, a three-dimensional model of the irregularly shaped curved steel membrane structure canopy is constructed based on the design parameters. The weight of the irregularly shaped curved steel membrane structure canopy is estimated based on this three-dimensional model, and the volume, embedment depth, and strength of the pre-embedded bolt bases are designed based on this weight information.

[0050] In one embodiment of the present invention, a base with screws is pre-embedded in the concrete foundation during the pouring process. The base with screws includes three parallel steel plates, which are fixedly connected by multiple parallel screws. Before pre-embedding, the screws are tensioned.

[0051] Step two involves fabricating irregularly shaped curved surface template plates and then constructing an irregularly shaped curved surface steel frame structure based on these template plates. This irregularly shaped curved surface steel frame structure includes an outer frame of the main steel structure and an inner steel frame of the main steel structure. In this embodiment, two concrete foundations are symmetrically arranged, and correspondingly, each concrete foundation is equipped with two bases with screw rods. The outer frame of the main steel structure includes a main structure of the outer frame connected to the bases with screw rods. This main structure of the outer frame consists of two irregularly shaped curved surface frame structures, and the inner steel frame of the main steel structure is located within the main structure of the outer frame.

[0052] As an optional embodiment of the present invention, step two, the fabrication of the irregular curved surface template sheet, includes the following steps:

[0053] (21) Based on the three-dimensional model of the irregular curved steel membrane structure canopy, the curvature of the outer surface of the irregular curved steel membrane structure canopy is analyzed. Based on the analysis results, the steel column part of the irregular curved steel frame structure is divided into segments to generate multiple steel column segments.

[0054] (22) Based on the column space curved surface shape of the steel column segment and the size of the template plate, template joints are made on the template plate to generate an irregular curved surface steel frame structure model with template joints.

[0055] (23) Based on the irregular curved surface steel frame structure model of steel column segments and template joints, extract the geometric data of the grid surface of the outer surface of the steel column, determine the spatial geometry and outer contour size of the template plate, and carry out three-dimensional digital design of the template plate for each steel column segment.

[0056] (24) The template panels are assembled in batches according to the construction segments, and the number of template panels and joints is counted. The template panels are projected, cut and three-dimensional perspective is performed using BIM technology to generate template panel construction drawings and processing drawings, and irregular curved surface template panels are prepared.

[0057] As an optional embodiment of the present invention, step two, the fabrication of the irregular curved surface template sheet further includes setting a model for minimizing the material consumption of the template sheet, and calculating the minimum amount of material used in the template sheet. The model for minimizing the material consumption of the template sheet is as follows:

[0058]

[0059] Where G is the minimum amount of material used in the template sheet, C′ is the material density, and H(T) i T represents the thickness of the i-th template plate. i Let be the i-th template piece, n be the number of template pieces, and A be the surface area of ​​the i-th template piece.

[0060] As an optional embodiment of the present invention, step two, performing curvature analysis on the outer surface of the three-dimensional model, includes: reflecting the actual degree of curvature of the surface through Gaussian curvature.

[0061] Step three involves connecting the outer frame of the main steel structure to the bolt-supported base using a hoisting and positioning method. Then, the internal steel frame of the main steel structure is welded to the outer frame one by one. In this step, bolt-supported bases are pre-embedded in the concrete foundation, and bolt holes are pre-drilled in the outer frame base according to the actual site conditions. After the outer frame is welded, it is hoisted and positioned, and then bolted with nuts to fix its position and ensure strength. After the outer frame is fixed to the embedded base, the internal steel frame is welded one by one to form a mesh-like main steel frame with a certain curvature.

[0062] Step four: Weld T-shaped steel for installing the membrane steel along the vertical lines of the irregular curved surface on the outer frame of the main steel structure and the inner steel frame of the main steel structure to form a membrane structure frame fixed to the outer frame of the main steel structure.

[0063] As an optional embodiment of the present invention, step four specifically includes the following steps:

[0064] (41) The outer surface of the irregular curved steel membrane structure canopy is translated by a specified displacement along its vertical direction. The two ends of the steel column segment are projected onto the translated curved surface. The three-dimensional coordinates of each projection point are obtained. The curve where the steel column segment is located is used as the first lofting curve. The projection points of the steel column segment on the same curve are fitted to obtain the second lofting curve.

[0065] (42) Construct a T-shaped steel lofting surface based on the first lofting curve and its corresponding second lofting curve, and perform lofting processing on the T-shaped steel based on the lofting surface;

[0066] (43) Weld T-shaped steels after layout treatment on the outer frame of the main steel structure and the inner frame of the main steel structure, so that the T-shaped steels are perpendicular to the corresponding outer frame of the main steel structure and the inner frame of the main steel structure, that is, the curved surface of the outer surface of the T-shaped steel panel is parallel to the curved surface of the outer surface of the irregular curved steel membrane structure canopy, so as to form a membrane structure frame fixed on the outer frame of the main steel structure.

[0067] In this step, T-shaped steel sections are welded onto the existing mesh steel frame to form the membrane steel structure frame. During this process, care should be taken to ensure that the edges and corners of the steel sections are ground smooth to avoid affecting the subsequent membrane material installation. The T-shaped steel sections in the membrane steel structure frame are pre-reserved according to the originally planned locations and spacing of the membrane material holes. During the steel structure welding process, attention should be paid to the fullness of the welds to ensure strength requirements. After the steel structure is inspected and accepted, it will be painted to ensure corrosion protection and achieve an aesthetically pleasing effect.

[0068] Step 5: Prepare membrane units according to the membrane structure framework, and install the corresponding membrane units one by one onto the membrane structure framework.

[0069] More specifically, in this step, membrane units are designed one by one according to the actual gridded membrane structure frame. The positioning points of the membrane units are aligned with the boundaries of the membrane auxiliary frames. Then, the membrane units are pulled to the installation position. During installation, aluminum alloy clamps are used to fix the position and provide protection. The short sides are installed and tensioned symmetrically first, and then the membrane accessories and bolts are installed sequentially from the middle to both sides. Finally, the long side bolts are installed and tensioning is completed. The other membrane units are installed in sequence. When installing the short side bolts, the membrane unit is gradually tensioned and flattened by tightening the bolts and pressing the aluminum alloy clamps. When installing and tensioning the membrane unit, the installation and tensioning are gradually carried out from the center point of the long side towards both ends. After the bolts are tightened and the membrane is flattened, the membrane unit is tensioned and installed in place.

[0070] In this step, the steel membrane structure canopy uses ETFE membrane material, a novel material, to replace ordinary glass to meet the lighting function. The construction is carried out by using a steel main frame in conjunction with waterproof materials such as ETFE membrane material, which achieves low cost, avoids material waste, and has a good landscape effect, thus achieving green and environmentally friendly results.

[0071] After all membrane units are installed, check the tension and unfolding of the membrane material to ensure it meets the original design requirements. Finally, touch up the paint on some of the nut parts to achieve a better landscape effect.

[0072] According to another aspect of the present invention, an irregular curved steel membrane structure canopy is also provided, which is prepared by any of the above embodiments or any combination of the above embodiments, comprising:

[0073] Concrete foundation 1, with a screw-loaded base 3 pre-embedded in the concrete foundation 1;

[0074] The irregular curved steel frame structure 2 is set on the concrete foundation 1 and is fixedly connected to the concrete foundation 1 through the screw base 3. The irregular curved steel frame structure 2 includes the main steel structure outer frame 21 and the main steel structure inner steel structure frame 22.

[0075] The membrane structure frame 4 is provided along the outer surface of the irregular curved steel frame structure 2;

[0076] The membrane unit 5 is fixedly embedded in the membrane structure frame 4 so that the membrane unit 5 and the membrane structure frame 4 together form a sealing structure.

[0077] As an optional embodiment of the present invention, the membrane structure frame 4 includes T-shaped steel 7 and edge strip 6 arranged perpendicularly to the outer frame 21 of the main steel structure or the inner steel structure frame 22 of the main steel structure. The T-shaped steel and edge strip are connected by bolts to fix the membrane unit 5 between the T-shaped steel and the edge strip.

[0078] As an optional embodiment of the present invention, a base with screws is pre-embedded in the concrete foundation during the pouring process. The base with screws includes three parallel steel plates, which are fixedly connected by multiple parallel screws. Before pre-embedding, the screws are tensioned to meet the prestress requirements.

[0079] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements 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 construction method for an irregularly shaped curved steel membrane structure canopy, characterized in that, Includes the following steps: Step 1: Pour the concrete foundation, during which a base with bolts is pre-embedded. Step 2: Fabricate irregular curved surface template plates and fabricate irregular curved surface steel frame structures based on the template plates. The irregular curved surface steel frame structure includes the main steel structure outer frame and the main steel structure internal steel structure frame. Step 3: Connect the outer frame of the main steel structure to the base with screw rods by hoisting and positioning. Then, weld the inner steel frame of the main steel structure to the outer frame of the main steel structure one by one. Step 4: Weld T-shaped steel for installing the membrane steel along the vertical line of the irregular curved surface on the outer frame of the main steel structure and the inner steel structure frame of the main steel structure to form a membrane structure frame fixed to the outer frame of the main steel structure. Step 5: Prepare membrane units according to the membrane structure framework, and install the corresponding membrane units one by one onto the membrane structure framework; In step one, a three-dimensional model of the irregular curved steel membrane structure canopy is constructed according to the design parameters, and the weight information of the irregular curved steel membrane structure canopy is estimated based on the three-dimensional model. Based on the weight information, the volume and depth of the concrete foundation and the strength of the pre-embedded screw base are designed. The process of fabricating the irregular curved surface template sheet includes the following steps: (21) Based on the three-dimensional model of the irregular curved steel membrane structure canopy, the curvature of the outer surface of the irregular curved steel membrane structure canopy is analyzed. Based on the analysis results, the steel column part of the irregular curved steel frame structure is divided into segments to generate multiple steel column segments. (22) Based on the column space curved surface shape of the steel column segment and the size of the template plate, template joints are made on the template plate to generate an irregular curved surface steel frame structure model with template joints; (23) Based on the irregular curved surface steel frame structure model of steel column segments and template joints, extract the geometric data of the grid surface of the outer surface of the steel column, determine the spatial geometry and outer contour size of the template plate, and carry out three-dimensional digital design of the template plate for each steel column segment; (24) The template panels are assembled in batches according to the construction segments, and the number of template panels and joints is counted. The template panels are projected, cut and three-dimensional perspective is performed using BIM technology to generate template panel construction drawings and processing drawings, and irregular curved surface template panels are prepared.

2. The construction method of an irregular curved steel membrane structure canopy according to claim 1, characterized in that, In step two, the fabrication of the irregular curved surface template sheet also includes setting a model to minimize the material consumption of the template sheet, and calculating the minimum amount of material used for the template sheet. The model to minimize the material consumption of the template sheet is as follows: in, The minimum amount of material to be used for the template panels. For material density, For the first i The thickness of each template sheet For the first i One template panel, n For the number of template panels, A For the first i The surface area of ​​each template panel.

3. The construction method of an irregular curved steel membrane structure canopy according to claim 1, characterized in that, Step four specifically includes the following steps: (41) The outer surface of the irregular curved steel membrane structure canopy is translated by a specified displacement along its vertical direction. The two ends of the steel column segment are projected onto the translated curved surface to obtain the three-dimensional coordinates of each projection point. The curve where the steel column segment is located is used as the first lofting curve. The projection points of the steel column segment on the same curve are fitted to obtain the second lofting curve. (42) Construct a T-shaped steel lofting surface based on the first lofting curve and its corresponding second lofting curve, and perform lofting processing on the T-shaped steel based on the lofting surface; (43) Weld T-shaped steel after layout treatment on the outer frame of the main steel structure and the inner frame of the main steel structure, so that the T-shaped steel is perpendicular to the corresponding outer frame of the main steel structure and the inner frame of the main steel structure, that is, the curved surface of the outer surface of the T-shaped steel panel is parallel to the curved surface of the outer surface of the irregular curved steel membrane structure canopy, so as to form a membrane structure frame fixed on the outer frame of the main steel structure.

4. A construction method for an irregularly shaped curved steel membrane structure canopy according to any one of claims 1-3, characterized in that, Step five specifically includes the following steps: Based on the membrane structure frame, membrane units are designed one by one. The positioning points of the membrane units are aligned with the boundaries of the membrane auxiliary frame. The membrane units are then pulled to the installation position. During installation, aluminum alloy edge clamps are used to fix the position and provide protection. The short sides are installed and tensioned symmetrically first. Then, the membrane accessories and bolts are installed from the middle to both sides in sequence. Finally, the long side bolts are installed and tensioning is completed. Other membrane units are installed in sequence.

5. The construction method of an irregular curved steel membrane structure canopy according to claim 4, characterized in that, Step five also includes: When installing the short side bolts of the membrane unit, the membrane unit is gradually tensioned and flattened by tightening the bolts and pressing the aluminum alloy clamps. When installing and tensioning the membrane unit, start from the center point of the long side and gradually install and tension towards both ends. After the bolts are tightened and the membrane is flat, it is tensioned and installed in place. After all membrane units are installed, check the degree of tension and unfolding of the membrane material to ensure that it meets the original design requirements.

6. The construction method of an irregular curved steel membrane structure canopy according to claim 4, characterized in that, This also includes painting the exposed steel structure and bolts.

7. A curved steel membrane structure canopy, manufactured using the method described in any one of claims 1-6, characterized in that, include: A concrete foundation (1) is provided, and a base (3) with a screw is pre-embedded in the concrete foundation (1). The irregular curved steel frame structure (2) is set on the concrete foundation (1) and is fixedly connected to the concrete foundation (1) through the screw base (3). The irregular curved steel frame structure (2) includes the main steel structure outer frame (21) and the main steel structure inner steel structure frame (22). A membrane structure frame (4) is provided along the outer surface of the irregular curved steel frame structure (2); The membrane unit (5) is fixedly embedded in the membrane structure frame (4) so ​​that the membrane unit (5) and the membrane structure frame (4) together form a sealing structure.

8. The irregular curved steel membrane structure canopy according to claim 7, characterized in that, The membrane structure frame (4) includes T-shaped steel and edge strips arranged perpendicularly to the outer frame (21) of the main steel structure or the inner steel structure frame (22) of the main steel structure. The T-shaped steel and edge strips are connected by bolts to fix the membrane unit (5) between the T-shaped steel and edge strips.

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