Micro-curved-surface transparent acrylic LED transparent screen positioning and mounting method

Abstract

The invention provides a micro-curved-surface transparent acrylic LED transparent screen positioning and installing method. The method comprises the following steps that 1, construction technology preparation is conducted; 2, processing main materials; 3, round pipe structure supporting rod pieces and I-shaped round pipe main body keels are installed, and a gallery road is maintained; 4, anti-corrosion paint is coated; step 5, mounting an angle-adjustable module mounting piece; step 6, installing a first part of LED transparent screen module; 7, the scaffold erected on the outer side of the steel structure of the original building mentioned in the step 1 is dismantled; step 8, mounting a polycarbonate plate; (9) the scaffold erected on the inner side of the steel structure of the original building mentioned in the step (1) is dismantled; 10, transparent acrylic is installed; step 11, erecting an angle-adjustable module mounting piece; 12, installing a second part of LED transparent screen module; 13, the frame body is dismantled; according to the micro-curved-surface acrylic LED transparent screen mounting device, accurate positioning can be guaranteed, and mounting of a micro-curved-surface acrylic LED transparent screen can be efficiently completed.

Description

Technical Field

[0001] The invention relates to the technical field of LED transparent screen installation, and in particular to a positioning and installation method for a micro-curved transparent acrylic LED transparent screen. Background Art

[0002] With the continuous advancement of technology, the form of LED transparent screens is constantly innovating. The three-dimensional modular design and visual optimization design enable it to obtain a wide-viewing angle display effect at different angles. However, in the process of its installation, how to accurately position it has become a key difficulty in the construction process. The traditional display screen positioning and installation uses a total station for ring positioning. However, in the face of micro-curved display screens, it has a special shape and requires multiple turnover positioning. In addition, there is the obstruction of the original structure, which makes it difficult to lay out the line and will cause cumulative measurement errors. Therefore, the traditional positioning and installation method of micro-curved display screens is not feasible. How to ensure accurate positioning while efficiently completing the installation of micro-curved acrylic LED transparent screens has become a difficult problem that technicians in this field need to solve urgently. Summary of the invention

[0003] Purpose of the invention: The purpose of the present invention is to address the deficiencies in the prior art and provide a method for positioning and installing a micro-curved transparent acrylic LED transparent screen, which can not only ensure precise positioning, but also efficiently complete the installation of the micro-curved acrylic LED transparent screen.

[0004] Technical solution: The positioning and installation method of a micro-curved transparent acrylic LED transparent screen described in the present invention comprises the following steps: Step 1, make technical preparations for construction; Step 2, process the main materials: including processing the round tube structure support rods; processing the round tube main body keel; processing the square tube for the maintenance plank road; processing the polycarbonate board; processing the transparent acrylic; Step 3, install the round tube structure support rods, the round tube main body keel and the maintenance plank road; Step 4, apply anti-corrosion paint; Step 5, install the adjustable angle module mounting part in the middle and upper position of the outer curved surface; Step 6, install the first part of the LED transparent screen module; Step 7, remove the scaffolding erected on the outside of the steel structure of the original building mentioned in step 1; Step 8, install the polycarbonate board; Step 9, remove the scaffolding erected on the inside of the steel structure of the original building mentioned in step 1; Step 10, install the transparent acrylic; Step 11, set up the frame inside the transparent acrylic and install the adjustable angle module mounting part on the inside of the acrylic board; Step 12, install the second part of the LED transparent screen module; Step 13, remove the frame inside the transparent acrylic.

[0005] In the present invention, the display screen is disassembled into 7 special modules, which simplifies the construction complexity, facilitates phased transportation and assembly, and reduces the installation risk of large-size components. The three-dimensional laser scanning and reverse modeling technology accurately matches the original structural parameters, divides 54 control areas to extract geometric data, ensures the dimensional adaptability of subsequent component processing and installation, and reduces on-site adjustments. The internal and external double-row disc-type scaffolding provides a stable operation platform, and the three-level disclosure and certification system strengthens the controllability of construction safety and quality.

[0006] Further, step 1 is specifically as follows: Step 1.1, deepen the drawings and divide the micro-curved transparent acrylic LED transparent screen into seven installation modules; Step 1.2, use a three-dimensional laser scanner to scan the steel structure of the original building to generate a point cloud model, divide the model into several control areas, extract the height and corner coordinates of the components in each control area, and calculate the length and slope of the components in each control area; Step 1.3, set up scaffolding on the inner and outer sides of the steel structure of the original building and assess the on-site operators.

[0007] Further, in step 2, the processing of the round tube structure support members is specifically as follows: According to the length and slope of the components in each control area calculated in step 1, make round tubes of different lengths, with one end of the round tube cut flat and polished, and the other end made into a semi-circular arc shape.

[0008] Further, in step 2, the processing of the round tube main keel is specifically as follows: Assemble the corresponding elbows, steel pipes and pipe fittings, make the bending degree of the steel pipes according to the drawing requirements, and straighten, cut and polish.

[0009] Further, in step 2, the processing of the polycarbonate board is specifically as follows: ① Raw material preparation: polycarbonate resin, catalyst, flame retardant, filler, pigment; ② Pre-treatment of polycarbonate resin: Cut the resin into appropriate-sized particles according to needs; ③ Raw material mixing: Manually stir or use a mechanical stirring device to mix the pre-treated polycarbonate resin, catalyst, flame retardant, filler and pigment in a set ratio; ④ Melting: Put the mixed raw materials into a melting device for melting, and control the reaction temperature, pressure and time parameters during the process to control the reaction rate and product quality; ⑤ Extrusion: Extrude the molten raw materials from the barrel, and during the extrusion process, the raw materials will pass through a mold to form the shape designed in the drawing; ⑥ Cooling: The extruded polycarbonate board is quickly cooled and solidified through a cooling device. During the cooling process, the hardness of the board gradually increases; ⑦ Cutting and trimming: Use equipment such as a cutting machine or saw to cut the solidified board, and use a scraper and grinding tool for trimming to ensure that it meets national standards and requirements.

[0010] In the present invention, the pre-treatment resin particle + mechanical stirring mixing process ensures the uniform distribution of the catalyst and the additive, avoids material stratification or local property defects, and improves the mechanical stability of the plate; during the melting stage, the temperature (±2°C), pressure, and reaction time are precisely controlled to inhibit the degradation of polymer chains and ensure the melt fluidity; combined with the die extrusion molding technology, the millimeter-level accuracy reduction of the curvature and thickness designed in the drawing is achieved; the rapid cooling process (such as the combined use of water cooling and air cooling) enables the plate to complete the phase change curing within 30 seconds, reduces the internal residual stress, and avoids warping and deformation; the cutting and trimming process is processed by numerical control equipment to ensure the flatness of the plate edge and improve the installation matching degree with the main keel.

[0011] Further, step 5 is specifically as follows: Install from the middle of the outer curved surface upwards. The adjustable module mounting part is composed of a 304 stainless steel buckle, a 3mm thick 304 stainless steel back plate, an HM5×16mm three-in-one internal hexagonal socket head screw, and a PM4×12mm three-in-one cross round head screw. First, fix the 304 stainless steel buckle in the one-step frame body on the round tube main keel with the three-in-one internal hexagonal socket head screw, and then fix the 3mm thick 304 stainless steel back plate in the one-step frame body on the stainless steel buckle with the three-in-one internal hexagonal socket head screw. During the process, use a laser level to adjust the straightness of the installation of the buckle and the back plate, and install the step-by-step frame according to the above process.

[0012] The progressive installation sequence from the middle of the curved surface upwards, combined with the adjustable module design, enables construction workers to flexibly respond to the changes in the curved surface radian, reduces on-site cutting or secondary processing, greatly improves the installation efficiency and reduces the labor cost; the combined fixing method of the stainless steel buckle and the back plate can evenly disperse the dynamic load (such as wind pressure and vibration) of the curved surface screen to the main keel, avoiding the risk of material fatigue or cracking caused by local stress concentration; the installation scheme realizes the comprehensive improvement of functionality, durability, and economy through the coordinated optimization of materials science, structural mechanics, and construction methods.

[0013] Further, step 6 is specifically as follows: The LED transparent screen module processed according to the drawing is divided into 10 upper and lower regions in total. The waterproof grade of the screen body is IP31, and it is installed layer by layer in a wall-mounted manner. From the middle to the upper part, the display screen is fixed on the front of the adjustable angle module mounting part with four adjustable brackets in turn. During the installation process, adjust the brackets to make the upper and lower parts of the display screen fit tightly. Then, use a set of chasing screws with a specification of M4.2×16mm to fix the P3.9-7.8 electrical box body containing the wire group at equal intervals on the back of the adjustable angle module mounting part of each layer, connect the wire group to the display screen, and finally connect the electrical box body to the power supply.

[0014] The screen body is divided into 10 independent installation areas from top to bottom, realizing accurate positioning and debugging in blocks, reducing the risk of installation deviation of large-size curved screens, and facilitating later maintenance and repair of each area; four adjustable brackets are used in combination with angle module mounting parts to closely fit the upper and lower interfaces of the display screen through three-dimensional fine-tuning, eliminating assembly gaps, and improving the overall flatness and waterproof performance of the curved screen body; P3.9-7.8 electrical box bodies (including pre-installed wire groups) are arranged at equal intervals on the back of the mounting parts, and standardized interfaces are formed by fixing with follow-up screws, realizing concealed wiring and centralized control of strong and weak electric wires and cables, avoiding the risk of exposed cable aging, and meeting the requirements of IP31 waterproof grade; the mechanical matching of equidistant arrangement of modular boxes and M4.2×16mm follow-up screws ensures that the load of the electrical box is evenly transmitted to the main keel, reducing the risk of deformation caused by local stress concentration; the operation sequence of installing layer by layer from the middle upwards, combined with the design of adjustable brackets and pre-installed wire groups, reduces the adjustment frequency of high-altitude operations, shortens the single-layer installation time by about 30%, and improves the overall construction efficiency; the standard interface connection method between the electrical box and the power supply enhances the electrical compatibility between different batches of modules and reserves a technical interface for subsequent expansion and upgrading.

[0015] Further, step 10 is specifically as follows: according to the model, the board is deepened into 3 large pieces and 2 small pieces and hoisted to the floor for assembly; liquid PMMA glue is poured at the joints for secondary pouring, and after curing for 7 days, it is polished with 180-1000 mesh sandpaper in grades to ensure the same color as the surrounding area; the bottom C30 concrete groove is constructed synchronously, with built-in pads; the top is fixed with a thick stainless steel U-shaped groove and connected to the steel structure through welding bolts, and the welds are derusted and painted; during hoisting, 4 electric hoists are installed using the top steel structure for overall lifting, with the top embedded 50 mm into the U-shaped groove, the bottom inserted into the concrete groove, the side of the groove filled with mortar, and the top sealed with structural glue, controlling the positioning accuracy and force matching throughout the process. Secondary pouring of liquid PMMA glue + multi-stage polishing eliminates joint marks and ensures appearance consistency; the double-embedded structure of the concrete groove (C30) and the stainless steel U-shaped groove disperses stress, and the top structural glue seal enhances waterproofness; at the same time, electric hoists are arranged using the steel structure fulcrum to achieve the overall stable lifting of the acrylic, and the embedding depth is coordinated with the filling of mortar / colloid to ensure installation accuracy and wind pressure resistance.

[0016] Beneficial effects: Compared with the prior art, the advantages of the present invention are as follows: (1) The present invention disassembles the micro-curved transparent acrylic LED screen into 7 special modules and divides it into 10 independent installation areas, upper and lower, to achieve phased transportation and assembly, greatly reducing the hoisting risk and construction complexity of large-size components. At the same time, using 3D laser scanning and reverse modeling technology, the original steel structure is divided into 54 control areas to extract geometric data (such as height, corner coordinates, slope), and the processing parameters of the components are calculated to ensure the millimeter-level dimensional adaptability of components such as round tube support members and main keels. This modular design combined with digital modeling technology not only simplifies the on-site adjustment process, but also provides a stable operation platform through the internal and external double-row disc buckle scaffolds, and cooperates with the three-level disclosure and certified operation system to strengthen the controllability of construction safety and quality, comprehensively reducing the labor cost by more than...; (2) In the processing of polycarbonate plates, the pretreatment resin particles + mechanical stirring mixing process is adopted to ensure the uniform distribution of catalysts and additives, eliminate the risk of material delamination, and improve the bending strength and impact resistance of the plates; the temperature, pressure and reaction time are accurately controlled in the melting stage to inhibit the degradation of polymer chains and optimize the melt fluidity; combined with the die extrusion molding technology, the millimeter-level reduction of the drawing curvature and thickness is realized. The rapid cooling process (combined use of water cooling / air cooling) enables the plates to complete the phase change curing in a short time, reduces the internal residual stress, and avoids warping deformation; in addition, the semi-circular design at one end of the round tube support member and the process of cutting and polishing the other end enhance the contact area and stress transfer efficiency with the main keel, reducing the risk of local deformation; (3) The progressive installation strategy from the middle of the curve upwards in the present invention, combined with adjustable modules (304 stainless steel buckles + backplates) and four adjustable brackets, realizes three-dimensional space fine-tuning, makes the upper and lower interfaces of the display screen fit tightly, and improves the curve flatness and IP31 waterproof performance. The stainless steel buckles and backplates are fixed by combining hexagon socket head cap screws, evenly dispersing dynamic loads such as wind pressure and vibration to the main keel, avoiding material fatigue caused by local stress concentration. At the same time, the electrical box body of the pre-wired group is fixed at equal intervals with chasing screws, realizing the concealed wiring and centralized control of strong and weak electricity, and comprehensively improving the construction efficiency; (4) In the present invention, the transparent acrylic plate uses liquid PMMA glue for secondary pouring joints, combined with grading sanding and polishing with 180 - 1000 mesh sandpaper to eliminate joint marks and ensure appearance consistency. Bottom concrete grooves are provided with pads, and the top thick stainless steel U-shaped grooves are connected to the steel structure through welding bolts to form a double-embedded structure, dispersing the peak stress (wind pressure resistance performance ≥ 3.5 kPa); during hoisting, 4 electric hoists are arranged at the steel structure fulcrums for overall lifting, embedded 50 mm into the U-shaped groove and inserted into the bottom concrete groove, and the side of the groove is filled with mortar and the top is sealed with structural glue to ensure the installation accuracy and long-term stability. The weld rust removal and painting process further extends the anti-corrosion life; (5) The present invention constructs a three-dimensional safety operation system by disassembling and assembling the internal and external scaffolds in stages (outer side first and then inner side), pre-installing the maintenance walkway, and implementing a certification assessment system, reducing the risk of falling from height. The modular partition design of the LED screen and the standardized interface of the electrical box allow for the quick disassembly and replacement of faulty modules, improving the maintenance efficiency; the adjustable design of the stainless steel buckle and the backplane and the numerical control trimming process enable the components to have dimensional tolerance capabilities and adapt to the minor deformations of the building structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front elevation layout schematic diagram of the LED transparent screen; Figure 2 It is a side elevation layout schematic diagram of the LED transparent screen; Figure 3 It is a top view layout schematic diagram of the LED transparent screen; Figure 4 It is a side layout schematic diagram of the LED transparent screen; Figure 5 It is an enlarged view of the side elevation node at the bottom of the transparent acrylic; Figure 6 It is an enlarged view of the side elevation node at the top of the transparent acrylic; Figure 7 It is a three-dimensional diagram of the transparent acrylic and the U-shaped groove; Figure 8 It is a schematic diagram of the side sectional view of the maintenance walkway of the LED transparent screen; Figure 9 It is an enlarged view of a partial node of the LED transparent screen Figure 1 ; Figure 10 It is an enlarged view of a partial node of the LED transparent screen Figure 2 ; Figure 11 It is an enlarged view of the maintenance walkway; Figure 12 It is an enlarged view of the transparent acrylic node; Figure 13 It is a top sectional layout diagram of the upper half of the second layer of the LED transparent screen; Figure 14 It is an enlarged view of the top sectional node of the upper half of the second layer of the LED transparent screen; Figure 15 It is a top sectional layout diagram of the upper half of the seventh layer of the LED transparent screen; Figure 16 It is a top sectional layout diagram of the upper half of the fourteenth layer of the LED transparent screen; Figure 17 It is an enlarged view of the top sectional node of the upper half of the fourteenth layer of the LED transparent screen; Figure 18 It is a distribution diagram of the LED transparent screen control system; Figure 19It is the construction process flow chart of the micro-curved transparent acrylic LED transparent screen; In the figure: 1. Original steel structure; 3. Original structure; 5. C30 ordinary concrete; 6. Structural sealant; 7. 50mm transparent acrylic; 8. Concrete mortar filling; 9. Acrylic cushion block; 10. 10mm stainless steel U-shaped groove; 11. ф18 bolts and screws; 12. Maintenance walkway; 13. ф30×2 round tube main keel; 14. Adjustable angle module installation part; 15. LED transparent screen module; 16. ф30×2 round tube structure support member; 17. 100×100×2.0mm square tube; 18. 15mm polycarbonate board 18; 19. 10mm polycarbonate board 19. Specific implementation method

[0018] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the described embodiments.

[0019] Embodiment 1 As Figures 1 to 4 shown, in this embodiment, a new installation method is applied to the roof micro-curved transparent acrylic LED display screen of the commercial complex and basement project of Plot A in Plot XDG-2018-16, and the installation positioning work is completed accurately and efficiently.

[0020] Step 1. Prepare construction technology: Deepen the drawings, divide the display screen into seven parts: ф30×2 round tube structure support member 16, ф30×2 round tube main keel 13, adjustable angle module installation part 14, maintenance walkway 12, polycarbonate board, LED transparent screen module 15, and 50mm transparent acrylic 7; use a three-dimensional laser scanner to scan the original steel structure, generate a point cloud model, and through reverse modeling, form a three-dimensional model. Divide the model into 54 control areas, extract the height and corner coordinates of the components in each area, and calculate the length and slope of the components in each area; set up a full-house operation scaffold according to the original building structure 3, surrounding environment, construction live load, and material transportation conditions. The scaffold uses Φ48×3.2 socketed disc-type steel pipes, the longitudinal and transverse spacing of the vertical poles is 1.8m×1.8m, the step distance is 2.0m, the bottom-sweeping rod is not more than 550mm from the foundation surface, and adjustable bases or cushion woods are set at the bottom of the vertical poles; conduct three-level technical disclosures to all on-site operators and pass the assessment. Special operators such as welders must hold certificates to work, and the quality grade of all welds is grade three.

[0021] Step 2. Process the main materials: 1) Processing of round tube structure support members: According to the three-dimensional model, make round tubes of different lengths. One end of the round tube is cut flat and polished, and the other end is laser cut according to the radius of the round tube to make a semi-circular arc shape.

[0022] 2) Processing of the circular pipe main keel: ① Select appropriate elbows and pipe fittings; ② Tighten the nuts between the steel pipe, elbow and pipe fittings; ③ Adopt the rolling pipe bending method. Put the steel pipe into the rolling machine and move the steel pipe up and down with the roller to deform the steel pipe to reach the required angle; ④ Straighten, cut and polish the bent steel pipe.

[0023] 3) Processing of the trestle square pipe: ① Select appropriate mechanical bending equipment, clamp the square pipe on the machine fixture, and set the bending angle and curve; ② Continuously adjust the position and angle of the fixture during the bending process to ensure the flatness and accuracy of the bending; ③ After bending, use a file to process the elbow to make it flat and burr-free.

[0024] 4) Processing of polycarbonate sheets: ① Raw material preparation: polycarbonate resin, catalyst, flame retardant, filler, pigment; ② Pretreatment of polycarbonate resin: Polycarbonate resin is the key raw material in the polymerization process and needs to be pretreated to ensure its purity and stability. Cut the resin into appropriate-sized particles according to requirements; ③ Mixing of raw materials: Manually stir or use mechanical stirring equipment to mix the pretreated polycarbonate resin, catalyst, flame retardant, filler and pigment and other raw materials in a certain proportion; ④ Melting: Put the mixed raw materials into the melting equipment for melting. During the process, control parameters such as reaction temperature, pressure and time to control the reaction rate and product quality; ⑤ Extrusion: Extrude the molten raw materials from the barrel. During the extrusion process, the raw materials will pass through a mold to form the required shape; ⑥ Cooling: The extruded polycarbonate sheet is quickly cooled and solidified through a cooling device. During the cooling process, the hardness of the sheet gradually increases; ⑦ Cutting and trimming: Use equipment such as a cutting machine or saw to cut the solidified sheet, and use tools such as a scraper and grinder for trimming to ensure that it meets the relevant national standards and requirements.

[0025] 5) Transparent acrylic processing: ① CNC drilling: According to the dimensions marked on the detailed drawing on the computer, the drawing is made on the computer and input into the CNC machine, and the machine automatically runs for drilling; ② Select imported optical grade PMMA sheets with a thickness tolerance ≤ 0.5 mm, with a PET protective film on the surface. Pre-cut according to the dimensions of the detailed model: Use a double-head CNC cutting machine, leave machining allowance. After cutting, use a lint-free cloth dipped in isopropyl alcohol to clean the board surface to eliminate static adsorption of impurities; ③ Soften the parts to be bent with hot air, and simultaneously use a hydraulic molding machine with an aluminum alloy mold for pressing and shaping. The pressure holding and cooling time ≥ 30 minutes; ④ Use a 45° diamond chamfering tool supporting the CNC for C0.5 mm chamfering processing, and then process it with a three-axis polishing machine (gradually grinding with 600 - 3000 mesh sand belts), and the edge glossiness reaches above 90 GU; ⑤ Rapidly burn the cutting section with propane oxygen flame (temperature 800 - 1000 °C) (residence time ≤ 0.5 seconds / 10 cm) to eliminate microcracks and improve light transmission uniformity; ⑥ Deposit SiO2 nano-coating through a magnetron sputtering coating machine, apply polythiophene-based conductive coating by roll coating process (surface resistivity 10^6 - 10^8 Ω / sq), and pass the cross-cut test after curing.

[0026] Step 3: Installation of the φ30×2 round tube support members Use a level to lead the elevation line of the original building structure to the starting point of the outer periphery of the bottommost area. Position a circle of round tube support members according to the points extracted by 3D laser scanning. The levelness of each area is controlled by a laser scanner. Clean and polish the surface of the original steel structure 1, fully weld the straight end of the round tube to the original steel structure 1, and grind all welds with a grinding wheel. For the corners, assist with a wire brush and a hammer for cleaning.

[0027] Step 4: Installation of the φ30×2 round tube main keel 13 According to the positioning extracted by 3D laser scanning, make positioning cards of the same length with 20×30×2 mm galvanized square tubes. Control the inclined plane length of the positioning card as a right triangle. Install the main keel according to the principle of layering and sectioning. The installation sequence of each area is consistent. The installation joints of the main keel in each area should be staggered by 1 / 3 - 1 / 2 of the circumferential length. The spacing of the positioning cards is controlled within 1 m. Use a plumb bob to position the slope of the keel and a laser scanner to control the levelness. After preliminary positioning, temporarily fix it with 20×30×2 mm galvanized square tubes. After positioning the round tubes in the whole area, fully weld, remove the temporary positioning square tubes, and grind the welded parts with a grinding wheel. For the corners, assist with a wire brush and a hammer for cleaning.

[0028] Step 5: Installation of the maintenance walkway 12 A maintenance plank road 12 is set up every 2m up and down. The plank road is arranged in a circle around the steel structure column with a width of 600mm. The plank road is welded and assembled using square tubes. The specifications of all square tubes 17 are 100×100×2.0mm. The spacing between square tubes on the tread surface of the plank road is 600mm. The assembled plank road is welded to the steel structure column. The plank road is equipped with square tube guardrails with a spacing of 1m and a height of 2m.

[0029] Step 6: Anti-corrosion paint The anti-rust paint is applied to all welding parts by manual brushing. After the anti-rust paint is formed, the round tube support rods, the round tube main body keel and the maintenance plank road 12 are topcoated. After the topcoat is applied, the finished product is protected.

[0030] Step 7: Install the adjustable angle module mounting piece 14 Install from the middle of the outer curved surface upwards. The adjustable module mounting parts are composed of 304 stainless steel clips, 3mm thick 304 stainless steel back plates, HM5×16mm three-in-one hexagon socket head screws and PM4×12mm three-in-one cross round head screws. First, fix the 304 stainless steel clips in the one-step frame body to the main keel of the round tube with three-in-one hexagon socket head screws, and then fix the 3mm thick 304 stainless steel back plates in the one-step frame body to the stainless steel clips with three-in-one hexagon socket head screws. During the process, use a laser level to adjust the installation straightness of the clips and the back plates. Install the frame step by step according to the above procedures.

[0031] Step 8: Installation of LED transparent screen module 15 The LED transparent screen module 15 processed according to the detailed drawings is divided into 10 upper and lower areas, and is installed layer by layer in a wall-mounted manner. From the middle to the top, the display screen is fixed on the front of the adjustable angle module mounting part 14 with four adjustable brackets. During the installation process, the brackets are adjusted to make the display screen fit tightly up and down. Then, a set of M4.2×16mm rear-end screws are used to fix the P3.9-7.8 electrical box body containing the wire group at equal intervals on the back of the adjustable angle module mounting part 14 of each layer, and the wire group is connected to the display screen. Finally, the electrical box body is connected to the power supply.

[0032] Step 9: Remove the outer frame Safety technical explanation shall be conducted before dismantling the frame, and a cordon shall be set up on site with someone on guard. The dismantling of the frame shall be carried out from top to bottom in accordance with the principle of "support first and then dismantle, and then support first and then dismantle", and it is strictly forbidden to dismantle the entire layer of wall ties, diagonal braces and scissors braces. They shall be dismantled simultaneously with the frame when dismantling this part. The dismantled components shall be transferred to the ground by lifting equipment or manually, and throwing is strictly prohibited. The dismantling process shall not be carried out simultaneously from top to bottom to prevent falling objects from injuring people.

[0033] Step 10: Polycarbonate sheet installation The polycarbonate plates processed according to the preliminary deepened drawings are fixed on the side square tubes of the maintenance walkway 12 with cross-recessed countersunk chasing screws of specification M4.8×35mm, and the 10mm-thick polycarbonate plates are fixed on the flat square tubes of the maintenance walkway 12 with cross-recessed countersunk chasing screws of specification M4.2×35mm. Three chasing screws are fixed on each side of the polycarbonate plate, and a metal ring and a stainless steel buckle cover are added to the top of the chasing bolts. The polycarbonate plates are closely arranged according to the maintenance walkway 12.

[0034] Step 11: Demolition of the inner frame The specific method for demolishing the inner frame is the same as that for demolishing the outer frame in Step 9. Before demolishing the frame, a safety technical disclosure is carried out, a warning line is set up at the site and guarded by someone. The frame demolition follows the principle of "demolishing the later-supported parts first and the earlier-supported parts later" and is carried out sequentially from top to bottom. The couplers, diagonal braces and shear braces are strictly prohibited from being demolished layer by layer. They should be demolished synchronously with the frame when disassembling this part. The disassembled components should be transferred to the ground by a lifting device or manually, and throwing is strictly prohibited. It is prohibited to carry out simultaneous up-and-down operations during the demolition process to prevent falling objects from hurting people.

[0035] Step 12: Installation of 50mm transparent acrylic 7 Such as Figures 5 to 7As shown in the figure, according to the three-dimensional model and the on-site layout plan, the acrylic board is deepened into three large pieces and two small pieces. The weight of the largest piece is 2.05T. The acrylic is transported to the floor by a truck crane for on-site assembly. Liquid polymethyl methacrylate is used for secondary pouring between the acrylic boards. After pouring, it is coagulated and cured for 7 days, and then hand-polished with sandpapers of 180 mesh, 320 mesh, 600 mesh and 1000 mesh respectively. After polishing, it is polished to the same color as the acrylic on both sides. Synchronously constructed with the assembly of the acrylic board is the concrete trough at the bottom of the acrylic. The concrete trough is cast in place with C30 ordinary concrete on site. The concrete on both sides of the trough is 150mm wide each, the height of the concrete is 180mm, the width inside the trough is 110mm, and the length of the trough is 100mm longer than the length of the bottom of the acrylic. Then, acrylic pads are placed. The top of the acrylic is fixed with a stainless steel U-shaped card slot. The wall thickness of the U-shaped card slot is 10mm, and its outer side is on the same plane as the outside of the acrylic board. The U-shaped slots are arranged at equal intervals with the original steel structure columns, and the length, width and height are all 50mm. First, screws are welded on the inner side of the U-shaped slot, and the screws of the U-shaped slot are tightly connected with the ф18 bolts. According to the on-site situation, stainless steel is embedded between the U-shaped slot and the steel structure for welding, and the end of the ф18 bolt is welded to the steel structure. All welded parts are cleaned of welding slag and painted with anti-rust paint. The outer side of the top of the acrylic board is sunken by 10mm. The acrylic is hoisted using the original steel structure at the top as a fulcrum. Four 3T chain electric hoists are installed at the bottom of the original steel structure. The acrylic is slowly lifted as a whole. The top is embedded 50mm into the U-shaped slot, and the bottom is embedded into the concrete trough. Then, the two sides of the bottom trough are filled with concrete mortar, and finally the top is sealed with structural glue. There is also structural sealant 6 in the figure.

[0036] Step 13: Erection of the inner frame of the acrylic The erection of the inner frame is the same as the content of erecting the full-span working scaffolding in Step 1. The scaffolding uses Φ48×3.2 socketed disc steel pipes. The longitudinal and transverse spacing of the vertical poles is 1.8m×1.8m, the step distance is 2.0m, the distance from the bottom sweeping rod to the foundation surface is not more than 550mm, and adjustable bases or wooden pads are set at the bottom of the vertical poles.

[0037] Step 14: Installation of the adjustable angle module fitting 14 It is installed at the inner part of the acrylic board and adjusted according to the gap between the acrylic board and the circular tube main keel. Its composition and installation method are the same as those in the middle and upper parts.

[0038] Step 15: Installation of the LED transparent screen module 15 At the inner side of the acrylic board and outside the adjustable angle module fitting 14, the LED transparent screen modules 15 in the remaining 5 areas are installed. Its composition and installation method are the same as those in Step 12 of the middle and upper parts.

[0039] Step 16: Demolition of the inner frame of the acrylic The removal of the framework is the same as that of the outer framework in Step 9. Before the removal of the framework, safety technical disclosure is carried out, warning lines are set up on site and guarded by personnel. The removal of the framework shall be carried out from top to bottom in sequence following the principle of "removing the laterally supported members first and the earlier supported members later". The connecting members, diagonal braces and shear braces are strictly prohibited from being removed layer by layer. They shall be removed synchronously with the framework when disassembling this part. The removed components shall be transferred to the ground by hoisting equipment or manually, and throwing is strictly prohibited. The removal process is prohibited from being carried out simultaneously up and down to prevent falling objects from injuring people.

[0040] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as a limitation of the present invention itself. Various changes in form and detail may be made without departing from the spirit and scope of the present invention defined by the appended claims.

Claims

1. A method for positioning and installing a micro-curved transparent acrylic LED transparent screen, characterized in that The steps include: Step 1, make technical preparations for construction; Step 2, process the main materials: including processing the round tube structure support rods; processing the round tube main body keel; processing the square tube for the maintenance plank road; processing the polycarbonate board; processing the transparent acrylic; Step 3, install the round tube structure support rods, the round tube main body keel and the maintenance plank road; Step 4, apply anti-corrosion paint; Step 5, install the adjustable angle module mounting part in the middle and upper position of the outer curved surface; Step 6, install the first part of the LED transparent screen module; Step 7, remove the scaffolding erected on the outside of the steel structure of the original building mentioned in step 1; Step 8, install the polycarbonate board; Step 9, remove the scaffolding erected on the inside of the steel structure of the original building mentioned in step 1; Step 10, install the transparent acrylic; Step 11, set up the frame inside the transparent acrylic and install the adjustable angle module mounting part on the inside of the acrylic board; Step 12, install the second part of the LED transparent screen module; Step 13, remove the frame inside the transparent acrylic.

2. According to claim 1, a method for positioning and installing a micro-curved transparent acrylic LED transparent screen is characterized in that: Step 1 is specifically as follows: Step 1.1, deepen the drawings, and divide the micro-curved transparent acrylic LED transparent screen into seven installation modules; Step 1.2, use a 3D laser scanner to scan the steel structure of the original building, generate a point cloud model, divide the model into several control areas, extract the height and corner point coordinates of the components in each control area, and calculate the length and slope of the components in each control area; Step 1.3, set up scaffolding inside and outside the steel structure of the original building, and assess the on-site workers.

3. According to claim 1, a method for positioning and installing a micro-curved transparent acrylic LED transparent screen is characterized in that: The specific steps of processing the circular tube structure support rod in step 2 are as follows: according to the length and slope of each control area component calculated in step 1, circular tubes of different lengths are manufactured, one end of the circular tube is cut flat and polished, and the other end is manufactured into a semicircular arc shape.

4. The positioning and installation method of a micro-curved transparent acrylic LED transparent screen according to claim 1, characterized in that: The specific steps of processing the main keel of the round tube in step 2 are: assemble the corresponding elbows, steel pipes and pipe fittings, make the curvature of the steel pipe according to the requirements of the drawing, and straighten, cut and grind it.

5. The positioning and installation method of a micro-curved transparent acrylic LED transparent screen according to claim 1, characterized in that: The processing of the polycarbonate sheet in step 2 is specifically as follows: ① Raw material preparation: polycarbonate resin, catalyst, flame retardant, filler, pigment; ② Polycarbonate resin pretreatment: cut the resin into particles of appropriate size as needed; ③ Raw material mixing: mix the pretreated polycarbonate resin, catalyst, flame retardant, filler and pigment according to the set ratio by manual stirring or mechanical stirring equipment; ④ Melting: put the mixed raw materials into the melting equipment for melting, and control the reaction temperature, pressure and time parameters during the process to control the reaction rate and product quality; ⑤ Extrusion: extrude the molten raw material from the barrel. During the extrusion process, the raw material will pass through a mold to form the shape designed in the drawing; ⑥ Cooling: The extruded polycarbonate sheet is quickly cooled and solidified by a cooling device. During the cooling process, the hardness of the sheet gradually increases; ⑦ Cutting and trimming: Use a cutting machine or saw and other equipment to cut the solidified sheet, and trim it with a scraper or grinding tool to ensure that it meets national standards and requirements.

6. The positioning and installation method of a micro-curved transparent acrylic LED transparent screen according to claim 1, characterized in that: Step 5 is specifically as follows: install from the middle of the outer curved surface upwards. The adjustable module mounting parts are composed of 304 stainless steel clips, 3mm thick 304 stainless steel back plates, HM5×16mm three-in-one hexagon socket head screws and PM4×12mm three-in-one cross round head screws. First, fix the 304 stainless steel clips in the one-step frame body to the main keel of the round tube with three-in-one hexagon socket head screws, and then fix the 3mm thick 304 stainless steel back plates in the one-step frame body to the stainless steel clips with three-in-one hexagon socket head screws. During the process, use a laser level to adjust the installation straightness of the clips and the back plates. Install the frame step by step according to the above steps.

7. The positioning and installation method of a micro-curved transparent acrylic LED transparent screen according to claim 1, characterized in that: Step 6 is as follows: the LED transparent screen module processed according to the drawing is divided into 10 upper and lower areas. The screen body is waterproofed to IP31 and is installed layer by layer in a wall-mounted manner. From the middle to the top, the display screen is fixed on the front of the adjustable angle module mounting part with four adjustable brackets. During the installation process, adjust the brackets to make the display screen fit tightly up and down. Then use a set of M4.2×16mm rear-end screws to evenly fix the P3.9-7.8 electrical box body containing the wire group on the back of each layer of the adjustable angle module mounting part, connect the wire group to the display screen, and finally connect the electrical box body to the power supply.

8. The positioning and installation method of a micro-curved transparent acrylic LED transparent screen according to claim 1, characterized in that: Step 10 is as follows: according to the model, the plate is deepened into 3 large pieces and 2 small pieces, and hoisted to the floor for assembly; liquid PMMA glue is poured into the joints for secondary pouring, and after curing for 7 days, it is graded and polished with 180-1000 grit sandpaper to ensure the same color as the surrounding area; the bottom C30 concrete groove is constructed simultaneously, with built-in pads; the top is fixed with a thick stainless steel U-shaped groove, connected to the steel structure by welding bolts, and the welds are rust-proofed and painted; when hoisting, 4 electric hoists are installed on the top steel structure for overall lifting, the top is embedded in the U-shaped groove 50mm, the bottom is inserted into the concrete groove, the groove side is filled with mortar, and the top is sealed with structural glue. The positioning accuracy and force matching are controlled throughout the process.

Images