Manufacturing method of inner and outer formworks of concrete shaft lining of vertical shaft constructed by large drilling machine

Abstract

The present application relates to the vertical shaft manufacturing technical field, especially relates to a large drilling rig construction vertical shaft concrete shaft wall inner and outer formwork manufacturing method.The method comprises the following steps: 1) according to the design drawing, using the level to carry out platform leveling; the inner and outer formwork of the vertical shaft is drawn on the leveled platform; 2) the welding shrinkage allowance of the inner and outer formwork is calculated, and the welding shrinkage allowance is pre-set through the calculation drawing size; the diameter line of the inner and outer formwork is drawn according to the calculated size, and the equal division line and the mold angle line are reserved; 3) the inner and outer formwork is eight-equal-division assembled into a whole; 4) after the inner and outer formwork is assembled into a whole, the inner and outer formwork is installed on the support; 5) the inner and outer formwork is welded; 6) after welding, the inner and outer formwork is polished. The method improves the precision of the inner and outer diameter, height, perpendicularity and camber of the formed formwork, and reduces the welding deformation and other phenomena.

Description

Technical Field

[0001] This invention relates to the field of vertical shaft manufacturing technology, and in particular to a method for manufacturing inner and outer formwork for concrete well walls in vertical shafts constructed by large drilling rigs. Background Technology

[0002] The promotion and application of deep well large-diameter drilling rigs in the western mining sector requires the prefabrication of concrete well walls during the construction of vertical shafts with large drilling rigs. The prefabrication process of concrete well walls requires inner and outer steel formwork.

[0003] These types of formwork are relatively large, with diameters of 6-10m and heights of 6m, so they are constructed using a multi-piece steel structure. The internal formwork must consider the angle at which it is disassembled, resulting in several different angles used in its fabrication. Previously, formwork fabrication was done using single-piece molds. However, this method resulted in several problems during final welding assembly. These included assembly errors, weld deformation, difficulty in controlling individual piece dimensions, diameter errors requiring later cutting and trimming, uneven vertical flange surfaces leading to grout leakage, poor overall curvature, and errors in verticality and concentricity. Therefore, solutions are urgently needed. Summary of the Invention

[0004] The present invention addresses the aforementioned technical problem by providing a method for manufacturing inner and outer formwork for the concrete well wall of a vertical shaft used in large drilling rig construction. This method employs a platform-based assembly and positioning welding process for formwork fabrication. This ensures the accuracy of the inner and outer diameters, height, verticality, and curvature of the formed formwork, guarantees the flatness of the vertical flange surface, and reduces welding deformation.

[0005] The method for manufacturing the inner and outer formwork of the concrete well wall for vertical shaft construction of large drilling rigs includes the following steps: 1) Based on the design drawings, use a level to level the platform; draw the diameter lines of the inner and outer templates of the vertical shaft on the leveling platform; 2) The shrinkage allowance for welding should be calculated during the scribing process. The shrinkage allowance should be pre-calculated based on the dimensions on the drawing. The inner and outer diameter lines should be drawn according to the calculated dimensions, and the bisector lines and the mold angle lines should be reserved. 3) The inner and outer templates of the vertical shaft are divided into eight equal parts and assembled as a whole; The process involves pre-assembling the inner and outer templates into a ring on a leveling platform, dividing them into eight equal arc segments with pre-defined circumferential dimension lines. Vertical flanges are then joined using positioning clamps to secure the joints, ensuring each arc segment has a central angle of 45°. A laser calibration device is used to control overall concentricity. Subsequently, while maintaining structural stability, the ring plates are spot-welded to solidify the shape, forming a complete ring-shaped mold. Once the ring plates are connected, vertical ribs are installed using laser lines according to the pre-defined lines on the platform. After the ribs are installed, the overall frame undergoes dimensional inspection and correction. 4) After the template of the vertical shaft is assembled, supports need to be installed on the inner and outer templates to ensure the forming size and control welding deformation and shrinkage; the overall positioning and assembly are controlled, the external dimensions are controllable, and the fit of the vertical flange face is controllable.

[0006] By rigidly fixing and connecting the components together, the deformation and shrinkage caused by subsequent welding are reduced, making the inner and outer templates controllable throughout the entire manufacturing process.

[0007] 5) Weld the inner and outer templates; 6) After welding, grind the inner and outer templates of the vertical shaft. After the support is removed, only simple grinding of the inner and outer templates of the vertical shaft is required to ensure that the template assembly dimensions are qualified, the overall curvature is well formed, and there is no leakage of grout on any connection surface during use.

[0008] Preferably, the installation process of the inner and outer templates of the vertical shaft shaft in step 3) includes: aligning the template group with the tooling platform and reserving the dimension lines, connecting the adjacent arc segments in 8 equal parts through vertical flanges, aligning the vertical flanges, aligning the lowest and uppermost circumferential plates, aligning the overall verticality, concentricity, and roundness, installing the circumferential stiffening plates and vertical stiffening plates, and installing the inner and outer template panels; On the construction platform, the inner and outer diameter lines of the template are accurately positioned. The position of the template is adjusted according to the measurement data. The template is divided into eight equal parts with a 45° angle line, which is used as the positioning reference line for the vertical flange between each section of the template. The platform has reserved vertical stiffening plate lines for the precise positioning and assembly of subsequent vertical stiffening plates, ensuring that each vertical stiffening plate intersects perpendicularly with the circumferential plate and that the spacing meets the design requirements. Based on the reserved lines, the eight equally divided vertical flanges are positioned and fixed with adjustable positioning supports, ensuring precise alignment of each section template in space. Adjustable positioning clamps are used to fine-tune the flange gaps and angular deviations, controlling the assembly error within ±1mm. The bottom circumferential plate is arranged according to the vertical flanges and the reserved ring diameter lines on the platform, ensuring that the circumferential plate intersects the vertical flanges and that the curvature is continuous. The circumferential plates are installed layer by layer upwards, with the position checked against the reserved ring diameter lines and vertical reference lines for each layer. Laser ranging and a level are used to verify the section height and levelness, ensuring that the overall concentricity error does not exceed 2mm. The butt joints between the circumferential plates are temporarily fixed with tack welding. After the entire ring is closed, the coincidence of the eight equally divided angular lines with the central axis is checked again. Formal welding is then carried out after confirming there are no deviations. During the installation of the top ring template, the spatial posture of each template is accurately positioned using a three-dimensional coordinate measurement system. Adjustable diagonal braces and guide clamps are used to adjust the section height, levelness, and verticality to ensure that the eight-division angle line coincides with the central axis.

[0009] The platform marking is based on the template diameter and eight equal division points, serving as the benchmark for template installation to ensure the accurate radial and circumferential positions of each layer of template. After marking, the symmetry between the center point and the eight equal division radial lines must be checked to avoid cumulative errors affecting the overall structural accuracy. All markings should be clear and durable, and the accuracy of the benchmark should be checked regularly during construction to ensure that subsequent template assembly, welding, and forming meet the design requirements.

[0010] Two vertical connecting flanges, divided into eight equal sections, are joined together and secured with bolts. Circumferential stiffeners are pre-installed on both sides of the vertical flanges to form connection lines. The joined vertical flanges are then precisely positioned on the eight pre-installed angular lines on the platform and initially secured using adjustable positioning supports to ensure the flanges are vertically aligned with the center axis. This ensures accurate installation of the vertical flanges and provides a reference for the subsequent assembly of the circumferential plates and vertical stiffeners. When connecting the bottom ring plate to the circumferential plate on the reserved line of the platform, accurately locate the position of the first plate according to the marking line to ensure that its radial and angular reference is accurate; then splice them one by one, and after each plate is installed, use a laser rangefinder to check its distance from the central axis to ensure the overall roundness; after the whole circle is closed, re-measure the overlap of the eight equal division points to ensure that the subsequent assembly dimensions meet the design requirements. When installing the bottom vertical ribs, the vertical flange is used as the reference. Laser calibration is used along the reserved vertical rib plate line of the platform to ensure the verticality and positioning accuracy of the ribs. Each rib is fixed to the bottom circumferential plate by electric welding.

[0011] The circumferential plates and vertical ribs are installed layer by layer upwards. Each layer of circumferential plates is positioned using the pre-reserved diameter line of the platform and the vertical reference line. A laser rangefinder is used to control the radius to ensure concentricity between layers. After the circumferential plates are joined, they are first fixed with tack welding. After the entire circle is closed, the coincidence of the eight-division angle line with the central axis is checked. Welding is carried out only after confirming that there is no deviation. The vertical ribs of the corresponding layers are installed simultaneously. The verticality and spacing of the ribs are checked with the installed circumferential plates as a reference. They are firmly connected by electric welding to ensure the overall stability and geometric accuracy of the structure.

[0012] When installing the top ring, a three-dimensional coordinate measurement system must be used to spatially position each template. Adjustable diagonal braces and guide clamps should be used to adjust the section height, levelness, and verticality to ensure that the eight-division angle line is accurately aligned with the central axis.

[0013] The specific operation includes the following steps: 31) Based on the reserved template inner and outer diameters, eight division points, vertical stiffeners and other dimensions and laser calibration lines on the measuring platform, the reserved reference lines and laser reference positioning are used for the subsequent bottom ring assembly, vertical eight division connecting flange, vertical stiffener assembly, and to ensure the accurate installation position of each component. 32) Based on the established baseline and laser calibration line, accurately assemble the bottom ring and the eight-segment arc template, install the vertical connecting flange and fix the interface with positioning clamps, and assemble the vertical stiffeners to ensure that the central angle of each arc segment is 45°. The concentricity and verticality are monitored in real time by the laser measuring instrument to ensure the overall geometric accuracy of the structure. 33) Using the bottom ring as a reference, assemble the circumferential plates layer by layer upwards. After each layer is installed, use a laser rangefinder and a level to check its section height, levelness and concentricity to ensure that the circumferential plates of each layer are tightly spliced ​​and without misalignment. Install circumferential stiffeners and vertical stiffeners, and maintain structural stability by adjusting the support system. Finally, ensure that the verticality, roundness and dimensional accuracy of the overall template meet the design requirements.

[0014] 34) Perform the assembly and installation of the top ring. Use a laser pointer to accurately locate the assembly point and ensure that the joint height, levelness and concentricity errors of the top ring and the upper ring plate are controlled within the design range. 35) Panel installation: Install the panels from the bottom up, layer by layer. Pay attention to the joint position and panel curvature dimensions for each layer to ensure that the curvature is well formed and meets the design requirements of the drawings. 36) Conduct a comprehensive review of the overall geometric parameters of the vertical shaft, including the roundness, verticality, flatness of the inner and outer templates, and tightness of the flange interfaces. Make fine adjustments to key control points and implement final fixing after confirming that there are no deviations. 37) Based on the verified overall structural dimensions and geometric accuracy, perform the final welding and fastening of the inner and outer template panels to ensure that the weld quality meets the design requirements, while avoiding the impact of welding deformation on the overall verticality and roundness.

[0015] Preferably, the welding shrinkage allowance mentioned in step 2) includes a 7mm pre-allocated allowance in the diameter direction as the welding shrinkage allowance in the template diameter direction, and a 5mm pre-allocated allowance in the height direction as the welding shrinkage allowance in the template height direction. This shrinkage compensation ensures that the structural dimensions meet design requirements after welding; all pre-allocated allowances must be clearly marked during marking to avoid misassembly. Preferably, the process of installing supports on the inner and outer templates of the vertical shaft in step 4) includes: the support system is made of seamless pipe using adjustable diagonal braces, with the upper part connected to the vertical flange of the template by positioning bolts, and the lower part welded to the platform with a base of set screws to ensure that the support system has sufficient rigidity and stability when the template is under stress; the spatial position of the template is finely adjusted by the set screws, and monitored in real time by a laser measuring instrument to ensure that the concentricity and verticality of the inner and outer templates of the shaft meet the construction accuracy requirements. The support system is arranged with a spacing of no more than 1.5m and in a symmetrical ring.

[0016] 41) Adjustable positioning supports are required during template fabrication. High-strength seamless steel pipes combined with double-nut locking devices are used to ensure adjustment accuracy and load-bearing capacity. The support length is fine-tuned via screw extension, with the adjustment range controlled within ±50mm to meet the spatial positioning requirements of the template. Vertical flanges are positioned to prevent them from tipping over during positioning, and the verticality of the flanges is adjusted to ensure they are aligned with the design axis. 42) Install the adjustable positioning supports on site. Distribute the prefabricated support units evenly on the inside or outside of the template according to the design spacing. Connect them to the vertical flange of the template with positioning bolts. Weld the base to the work platform to form a stable support system. During the installation process, use a laser pointer to simultaneously check the support axis and elevation to ensure that the force direction of each support unit is consistent. Prevent the vertical flange from tilting and position the verticality and coaxiality of the vertical flange. 43) Conduct overall debugging of the support system. Adjust the lead screw to gradually tighten the top screw bolts, correct the verticality of the template vertical flange installation, ensure the 45° angular distribution, and ensure that the eight equal division points are evenly distributed and that the template surface diameter and forming arc meet the design requirements. Use a total station to re-measure the coordinates of the template internal control points to ensure that the concentricity deviation is no more than 3mm and the roundness error is controlled within ±5mm. Finally, lock the double nut anti-loosening device to complete the rigid fixation of the support system.

[0017] Preferably, step 5) involves welding the inner and outer templates of the vertical shaft shaft, including: 51) Electric welding is used for fixing and segmented welding for reinforcement. A segmented symmetrical welding process is adopted. The vertical flange butt joint is welded first, followed by the circumferential splice joint. The welding heat input is controlled to reduce deformation. The geometric dimensions of the template are monitored in real time during the welding process to prevent excessive deformation caused by welding stress.

[0018] First, spot weld the joints of the template to ensure that the misalignment is no more than 1mm, and then locate the joint points to ensure the quality of the joint.

[0019] 52) Symmetrical segmented welding is used to prevent subsequent welding deformation and changes in the dimensions of the butt joint cracks, thereby reducing welding deformation; 53) Formal welding: Perform symmetrical segmented welding of the entire weld seam, with 8 welders working simultaneously. Strictly control the welding current and speed to prevent overheating and deformation. Use CO2 gas shielded welding for multi-layer, multi-pass welding to ensure a full weld seam free of slag inclusions, porosity, and other defects. The weld seam height should not be less than the design requirement of 8mm. At the same time, welding should offset the shrinkage between the templates. Control the welding sequence and weld segmentally from the symmetrical position to both sides to reduce residual stress. After each weld seam is completed, clean the slag and inspect to ensure the quality of the weld. 54) After welding is completed, the appearance quality of the weld is inspected. The weld inspection ruler is used to measure the excess height, undercut and misalignment to ensure that it meets the Class II weld standard. 100% ultrasonic testing is carried out on the welds of key stress parts, and the sampling rate is not less than 30%.

[0020] Preferably, the grinding process of the inner and outer templates of the vertical shaft in step 6) includes: First, use an angle grinder to clean the slag from the cutting area of ​​the template and grind the surface seams to ensure accurate assembly dimensions. Then, perform preliminary grinding on the surface of the assembly weld to remove spatter, burrs, and oxide layers to ensure weld quality.

[0021] 61) Use sandblasting to clean the oxide scale, rust and oil stains on the surface of each steel plate, improve the roughness of the substrate and enhance the adhesion of the coating; 62) After all parts have been cut, clean the oxide residue at the cut position, grind the cut surface to ensure that the assembly contact surface is flat and that the arc forming size and assembly size are accurate.

[0022] 63) Clean the burrs and impurities at the interface, and grind and clean the area around the weld to ensure the quality of subsequent welds.

[0023] 64) After welding is completed, clean the weld area and use a wire brush and angle grinder to remove spatter, scale and oil stains from the weld surface. Grind the weld to make it smoothly transition with the base material to ensure that there are no defects such as cracks and pores; ensure the quality of the subsequent template appearance.

[0024] 65) For the surface treatment of the template, use an electric grinder to thoroughly grind the inner wall of the template to remove weld spatter, burrs, and other imperfections, ensuring a smooth and flat inner wall. Then wipe the surface with a clean cloth to remove residual dust and oil stains, ensuring the inner wall of the template is clean and free of contamination. This prevents concrete adhesion or demolding difficulties during later use, improves demolding efficiency and the smoothness of the well wall surface, and avoids poor coating adhesion due to residual impurities, extending the template's service life. It also provides a clean base surface for subsequent painting operations and reduces adhesion resistance during concrete pouring, ensuring the quality of the well wall formation.

[0025] The beneficial effects of this invention are reflected in: (1) The method provided by this invention adopts a scheme of reserving welding shrinkage allowance, leveling and laying out the platform, and overall assembly and welding during the fabrication of the inner and outer steel formwork of the concrete well wall of the drilling rig vertical shaft, thus realizing a manufacturing process innovation. The fabrication of the inner and outer formwork abandons the single-piece mold making technology that has been used for decades, and adopts the platform as a whole assembly and positioning welding process for formwork fabrication. This ensures the accuracy of the inner and outer diameters, heights, verticality, and curvature of the formed formwork, the flatness of the vertical flange surface, and reduces the occurrence of welding deformation. This solves the problems of overall dimensional error, grout leakage of vertical connection flanges, single-piece welding deformation, and poor curvature forming of the assembled formwork that occur after the assembly of single-piece manufacturing, avoiding the need for later cutting, repair, and reshaping, and improving the construction quality.

[0026] (2) The method provided by the present invention improves the construction process of vertical shaft formwork, solves the problem that in the existing formwork manufacturing process, it is necessary to make process molds according to different curvatures and segment angles, saves construction costs and shortens the construction cycle. Attached Figure Description

[0027] Figure 1 This is a simplified design diagram of a single steel formwork panel of the present invention; Figure 2 This is a top view of the eight-part design of the vertical shaft wall according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the actual fabrication process of the steel formwork workshop in an embodiment of the present invention; Figure 4 This is a schematic diagram of the actual fabrication process of the steel formwork workshop in an embodiment of the present invention; Figure 5 This is a schematic diagram of the complete prefabrication and assembly of the inner and outer templates of the vertical shaft wall according to an embodiment of the present invention. Detailed Implementation

[0028] 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 a part of the embodiments of the present invention, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. 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.

[0029] Example like Figure 1-5 As shown, according to the present invention, a method for manufacturing inner and outer formwork for the concrete well wall of a large drilling rig construction shaft is provided. The inner and outer formwork for the well wall are prefabricated and assembled at the Cocogai construction site. At the Cocogai project construction site, the prefabricated concrete well wall on the ground is cast using the steel inner and outer formwork manufactured in this method. The assembly process includes the following steps: The first step is to assemble the inner template. Since the initial template has stability, the first template is fixed with an inner guide frame. The template is installed and aligned using a theodolite and laser line. Subsequent template pieces are hoisted into place in sequence and initially fixed by pre-set positioning pins and bolts. After each piece is installed, the transition of the curved surface is checked with a laser rangefinder to ensure that there are no misalignments between adjacent pieces.

[0030] The second step is to apply double-sided foam tape to the seam surface of each template before installation to ensure tight joints and prevent grout leakage. After all template panels are assembled, the verticality and center deviation are checked to ensure accurate structural dimensions.

[0031] The third step is to apply double-sided foam tape to the vibratory gate and the vertical connecting flange of each template before installing the outer template. Then, the outer template is hoisted. Using the inner template as a reference, the position of the outer template is adjusted by the support rods to maintain the designed distance between it and the inner template. Steel tie rods are used for tie fixing to enhance the overall rigidity.

[0032] The fourth step is to check the firmness of all connecting bolts and support systems before pouring to ensure that no displacement or deformation occurs during the concrete pouring process.

[0033] This process effectively improves the accuracy of template installation and construction efficiency, reduces the risk of on-site adjustments and rework, and achieves the goal of high-quality and high-efficiency well wall construction.

[0034] Through practical application verification at the Coco Gai construction site, this formwork system demonstrated excellent stability and reusability in the construction of vertical shaft walls. After formwork removal, the surface was smooth and flat, without honeycomb pitting or grout leakage; the joints were smooth and without misalignment, and the overall forming quality met design requirements. On-site measurements showed that the concrete strength of the shaft wall reached the C70 standard, with geometric dimensional deviations (inner and outer diameters) controlled within ±3mm and verticality error less than 1‰. The formwork system is reusable; 85 sections of shaft wall were poured on-site, all conforming to standards, and the formwork dimensions showed no deformation or changes, allowing for reuse in subsequent shaft wall construction, significantly reducing material consumption and construction costs. Combined with digital measurement and precise positioning technology, the system further improved the level of construction automation, providing reliable technical reference and practical experience for similar vertical shaft projects.

[0035] Construction results show that the formwork joints are tight, with no grout leakage throughout the process. The concrete molding quality is excellent, with a smooth, rounded surface and standard overall diameter and wall thickness dimensions. No bulging or other issues occurred. Compared to traditional methods, wooden formwork is prone to damage and bulging, requiring frequent replacements and repairs costing over 300,000 yuan. The construction cycle for a single well wall section was shortened to 18 hours, and the overall project schedule was completed nearly three months ahead of schedule, significantly improving construction efficiency. No rework or work stoppages occurred due to formwork issues, further ensuring project progress. The formwork surface is smooth after demolding, requiring no additional finishing treatment, saving subsequent finishing processes and labor costs. Reusability is stable, greatly reducing turnover losses and resulting in significant overall cost-effectiveness.

[0036] The application of this technology not only improves the level of safe and civilized construction, but also provides an efficient and reliable solution for shaft construction under complex geological conditions, possessing broad application value. This construction practice fully verified the reliability and economy of the formwork system; its excellent sealing performance completely eliminated grout leakage, resulting in a dense, smooth, and consistently high-quality concrete surface. Through efficient reuse, material input and labor costs were significantly reduced, saving over one million yuan per project and significantly shortening the construction cycle. Full-process digital management and precise installation ensured the geometric accuracy of the well wall, providing a replicable high-standard model for similar projects and possessing broad prospects for widespread application.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for manufacturing inner and outer formwork for the concrete well wall of a vertical shaft constructed by a large drilling rig, characterized in that, Includes the following steps: 1) Based on the design drawings, use a level to level the platform; draw the diameter lines of the inner and outer templates of the vertical shaft on the leveling platform; 2) During the marking process, the welding shrinkage allowance of the inner and outer templates of the vertical shaft should be calculated, and the welding shrinkage amount should be pre-set by calculating the dimensions on the drawing; draw the diameter lines of the inner and outer templates of the vertical shaft according to the calculated dimensions, and reserve the bisector lines and the template angle lines. 3) The inner and outer templates of the vertical shaft are divided into eight equal parts and assembled as a whole; 4) After the inner and outer templates of the vertical shaft are assembled as a whole, install supports on the inner and outer templates of the vertical shaft. 5) Weld the inner and outer templates; 6) After welding is completed, the inner and outer templates of the vertical shaft are ground. The installation process of the inner and outer templates of the vertical shaft shaft described in step 3) includes: 31) Based on the reserved template inner and outer diameters, eight division points, vertical stiffeners and other dimensions and laser calibration lines on the measuring platform, the reserved reference lines and laser reference positioning are used for the subsequent bottom ring assembly, vertical eight division connecting flange, vertical stiffener assembly, and to ensure the accurate installation position of each component. 32) Based on the established baseline and laser calibration line, accurately assemble the bottom ring and the eight-segment arc template, install the vertical connecting flange and fix the interface with positioning clamps, and assemble the vertical stiffeners to ensure that the central angle of each arc segment is 45°. The concentricity and verticality are monitored in real time by the laser measuring instrument to ensure the overall geometric accuracy of the structure. 33) Using the bottom ring as a reference, assemble the ring plates layer by layer upwards. After each layer is installed, use a laser rangefinder and a level to check its section height, levelness and concentricity to ensure that the ring plates of each layer are tightly spliced ​​and without misalignment. Install ring stiffeners and vertical stiffeners, and maintain structural stability by adjusting the support system. Finally, the verticality, roundness and dimensional accuracy of the overall template meet the design requirements. 34) Perform the assembly and installation of the top ring. Use a laser pointer to accurately locate the assembly point and ensure that the joint height, levelness and concentricity errors of the top ring and the upper ring plate are controlled within the design range. 35) Panel installation: Install the panels from the bottom up, layer by layer. Pay attention to the joint position and panel curvature dimensions for each layer to ensure that the curvature meets the design requirements of the drawings. 36) Conduct a comprehensive review of the overall geometric parameters of the vertical shaft, including the roundness, verticality, flatness of the inner and outer templates, and tightness of the flange interfaces. Make fine adjustments to key control points and implement final fixing after confirming that there are no deviations. 37) Based on the verified overall structural dimensions and geometric accuracy, perform the final welding and fastening of the inner and outer template panels to ensure that the weld quality meets the design requirements, while avoiding the impact of welding deformation on the overall verticality and roundness.

2. The method for manufacturing inner and outer formwork for the concrete well wall of a vertical shaft during large drilling rig construction according to claim 1, characterized in that, The welding shrinkage allowance mentioned in step 2) includes a 7mm pre-allocated diameter allowance in the direction of the inner and outer well wall steel template fabrication as a shrinkage allowance, and a 5mm pre-allocated shrinkage allowance in the height direction.

3. The method for manufacturing inner and outer formwork for the concrete well wall of a vertical shaft during large drilling rig construction according to claim 1, characterized in that, Step 4) describes the process of installing supports on the inner and outer templates of the vertical shaft. 41) A combination of high-strength seamless steel pipe and double nut locking device is adopted; the support length is finely adjusted by screw extension and retraction, and the adjustment range is controlled within ±50mm. The vertical flange is positioned and the verticality of the vertical flange installation is adjusted to ensure that the vertical flange is consistent with the design axis. 42) Install the adjustable positioning supports on site. Distribute the prefabricated support units evenly on the inside or outside of the template according to the design spacing. Connect them to the vertical flange of the template with positioning bolts. Weld the base to the work platform. During the installation process, use a laser pointer to simultaneously check the support axis and elevation. Check the verticality and coaxiality of the positioning vertical flange. 43) Conduct overall debugging of the support system. Adjust the lead screw to gradually tighten the top screw bolts, correct the verticality of the template vertical flange installation, and distribute it at a 45° angle. Use a total station to re-measure the coordinates of the control points inside the template to ensure that the concentricity deviation is no more than 3mm and the roundness error is controlled within ±5mm. Finally, lock the double nut anti-loosening device to complete the rigid fixation of the support system.

4. The method for manufacturing inner and outer formwork for the concrete well wall of a vertical shaft during large drilling rig construction according to claim 1, characterized in that, Step 5) involves welding the inner and outer templates of the shaft shaft, including: 51) First, spot weld the joints of the template to ensure that the misalignment is no more than 1mm and fix the joint points; 52) Symmetrical segmented welding reinforcement was adopted; 53) Formal welding: Perform symmetrical segmented welding of the entire weld seam, with 8 welders working simultaneously. Strictly control the welding current and speed to prevent overheating and deformation. Use CO2 gas shielded welding for multi-layer and multi-pass welding. The weld seam height should not be less than 8mm as required by the design. Welding should offset the shrinkage between the templates. Control the welding sequence and back-weld from the symmetrical position to both sides in segments. After each weld seam is completed, clean the slag and inspect it. 54) After welding is completed, the appearance quality of the weld is inspected. The weld inspection ruler is used to measure the excess height, undercut and misalignment to ensure that it meets the Class II weld standard. 100% ultrasonic testing is carried out on the welds of key stress parts, and the sampling rate is not less than 30%.

5. The method for manufacturing inner and outer formwork for the concrete well wall of a vertical shaft during large drilling rig construction according to claim 3, characterized in that, Step 6) describes the process of grinding the inner and outer templates of the vertical shaft shaft, which includes: 61) Use sandblasting to clean the oxide scale, rust, and oil stains from the surface of each steel plate; 62) After all parts have been cut, clean the oxide residue from the cut seams and grind the cut seam surface; 63) Clean the burrs and impurities at the interface, and grind and clean the area around the weld. 64) After welding is completed, clean the weld area. Use a wire brush and angle grinder to remove spatter, scale and oil from the weld surface. Grind the weld to a smooth transition with the base material to ensure there are no cracks or pores. 65) For the surface treatment of the template, use an electric grinder to grind the inner wall of the template to remove surface weld scars, spatter and burrs; then wipe the surface with a clean cloth to remove residual dust and oil stains.

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