A template pre-assembly method

Abstract

This invention relates to the field of template pre-assembly and discloses a template pre-assembly method, comprising the following steps: Step 1: Prepare the site, a 3D model, and several templates and horizontal connectors. Determine the planar position of the templates on the site and set several targets on the site, measuring the target coordinates with a total station; Step 2: Import the target coordinates into 3D software and import the 3D model according to the target coordinate positions; Step 3: Assemble the first-layer template and measure the corner points of the template with a total station for coarse adjustment; Step 4: Measure the target coordinates with a 3D scanner, convert the site coordinates into point cloud coordinates, collect the point cloud data of the template, and establish a point cloud model; Step 5: Compare the 3D model and the point cloud model for 3D deviation and fine-tune the template; Step 6: Connect the horizontal connectors in pairs with bolts, and weld each pair of horizontal connectors between adjacent templates to save on-site measurement time.

Description

Technical Field

[0001] This invention relates to the field of template pre-assembly, and more specifically to a template pre-assembly method. Background Technology

[0002] In the design of rectangular bridge pier formwork, a simple quality inspection is conducted on-site without pre-assembly or a fixed connection method. This results in each formwork panel being in a free-form state, not a fixed arrangement. Therefore, before each segment is poured, the current formwork requires positioning using a total station to determine its position. The method for measuring and determining the verticality of the formwork is the plumb line method: a plumb bob is fixed at the top of the formwork, and the distances from the top and bottom plumb lines to the formwork are measured to determine its verticality.

[0003] Therefore, measuring and positioning the formwork every time a rectangular bridge pier is poured would take a lot of time, and the on-site platform construction machinery would affect the formwork measurement. Summary of the Invention

[0004] The present invention aims to provide a template pre-assembly method to save on-site measurement time.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a template pre-assembly method, comprising the following steps:

[0006] Step 1: Prepare the site, 3D model, and several templates and horizontal connectors. Determine the planar position of the templates on the site and set up several targets on the site. Use a total station to measure the coordinates of the targets.

[0007] Step 2: Import the target coordinates into the 3D software, and import the 3D model according to the target coordinate position;

[0008] Step 3: Assemble the first-floor formwork and use a total station to measure the corner points of the formwork for rough adjustment;

[0009] Step 4: Measure the target coordinates using a 3D scanner, convert the field coordinates into point cloud coordinates, collect point cloud data of the template, and establish a point cloud model.

[0010] Step 5: Compare the 3D model and the point cloud model to identify 3D discrepancies and fine-tune the template accordingly;

[0011] Step 6: Connect the horizontal connectors in pairs with bolts, and weld each pair of horizontal connectors between adjacent templates.

[0012] The beneficial effects of this plan are:

[0013] 1. By comparing the point cloud model with the BIM model in three dimensions, the position and verticality of the template are adjusted to improve the accuracy of the template after it leaves the factory and ensure the verticality of the template after assembly.

[0014] 2. Ensure the verticality of the assembled template to reduce the amount of measurement work during on-site construction, thereby saving on-site measurement time.

[0015] 3. Compared to manual measurement using plumb lines, this method uses a 3D scanner for detection, which is more accurate, less affected by human subjective judgment, and has sufficient precision.

[0016] 4. After inspection, the template is fixed by welding horizontal connectors to fix its shape after assembly. Then, the bolts between each set of horizontal connectors are removed, and the template is disassembled for transport to the site for assembly.

[0017] Furthermore, in step one, the target includes several planar points and scanning points. The planar points are all set on the planar position of the template, and a prism sphere is placed on the scanning point. The scanning point is the center of the prism sphere. The coordinates of the planar points and scanning points on the planar position are measured using a total station.

[0018] In step four, the target coordinates measured by the 3D scanner are the coordinates of the scanning point.

[0019] Furthermore, the outer side of the template is provided with several back ribs, and each end of the back rib is provided with a diagonal brace. Between the diagonal braces of adjacent templates, there are diagonal braces and two nuts. The two ends of the diagonal braces pass through the two diagonal braces and are threadedly connected to the two nuts.

[0020] In step three, prepare the support components to support the template and form a rectangle, thus completing the assembly of the first-layer template; the coarse adjustment is done by adjusting the position of the support components.

[0021] In step five, the fine-tuning method is as follows: connect the adjacent templates with diagonal tie rods, and adjust the relative positions of the adjacent templates by rotating two nuts.

[0022] Furthermore, the template is provided with a reinforcing section on each side, with a beveled surface on the inner side of the reinforcing section, and horizontal connectors are provided on the outer side of the reinforcing section; the reinforcing section is a special-shaped tube with a right-angled triangular cross section, the beveled surface is the bevel of a right-angled triangle, and several stiffening plates are provided at equal intervals along the length direction inside the reinforcing section;

[0023] In step three, after the adjacent templates are vertically spliced, the beveled surfaces of the two reinforcing parts are attached together.

[0024] Furthermore, in step six, after welding the horizontal connectors, a rectangular pier is poured into the template. After removing the template, the corners of the rectangular pier are checked for misalignment.

[0025] Furthermore, the horizontal connector includes a vertically arranged vertical connecting plate and several horizontally arranged arc-shaped plates. Both ends of the arc-shaped plates are connected to the outer side of the reinforcing part and the side of the vertical connecting plate, respectively. The side of the vertical connecting plate away from the arc-shaped plate is the connection surface of the two horizontal connectors, and the connection surface is connected by bolts.

[0026] In step six, two horizontal connectors are used as a group, and two vertical connector plates are bolted together. The arc-shaped plates of the two horizontal connectors are then welded to the outer sides of the two adjacent templates.

[0027] Furthermore, in step six, after welding the arc-shaped plate of the horizontal connector, a second layer of template is erected, and vertical connectors are welded on the upper and lower sides of the template respectively. The vertical connectors include a horizontal connector plate and several vertically arranged triangular support plates. The support plates connect the outer side of the reinforcing part and the side of the horizontal connector plate. The upper and lower templates are connected by the vertical connectors.

[0028] Furthermore, in step six, the back rib can completely block the vertical connectors on the lower side of the template, and a hollow hole is formed between the two arc-shaped plates at the same height of a set of horizontal connectors, with the hollow hole and the beveled surface in continuous contact.

[0029] This solution also has the following effects:

[0030] 1. By strengthening the rigidity of the side of the formwork with reinforcing parts, the deformation of the formwork during construction is reduced. Therefore, as long as the formwork of the first layer is vertical, during subsequent construction, the verticality of the formwork can be automatically calibrated by connecting adjacent formwork with horizontal connectors, thereby reducing the deviation of the verticality of the formwork during construction and reducing the amount of measurement and positioning work.

[0031] 2. In the prior art, the template at the corner position is usually equipped with connecting bolts at the inside corner. However, in this solution, in order to reduce the deformation of the template, a reinforcing part is set. It is not possible to set a recessed shape such as inside corner, otherwise the strength of the reinforcing part will be reduced. Therefore, this solution sets a horizontal connector on the outside of the reinforcing part, and realizes the bolt connection of the template at the corner position through the horizontal connector.

[0032] 3. In the existing technology, the ends of the template are usually flat, and the bolt holes need to be manually aligned during assembly until the four corners of the rectangular pier template are connected. In this solution, since the ends of the template are beveled, only two opposite templates need to be fixed. The remaining two templates can be aligned with the bolt holes by pushing them inward along the beveled surface, which is convenient and quick and improves construction efficiency.

[0033] 4. With the first-layer formwork properly adjusted, the second-layer formwork does not require adjustment using a total station. During the bolt tightening process, the vertical and horizontal connecting plates cause adjacent formwork panels to slide simultaneously along the connecting surface, thus returning the formwork to its designed vertical position. The verticality of the formwork can be guaranteed solely by the vertical and horizontal connecting parts between the formwork panels, significantly accelerating the construction speed of the bridge piers.

[0034] 5. Since the connecting surfaces of the two horizontal connectors and the corresponding oblique surfaces of the reinforcing parts are coplanar, when the ends of the two templates are relatively displaced along the oblique surfaces, the bolts on the connecting surfaces are perpendicular to the direction of movement, thereby maximizing the use of the shear resistance of the bolts to prevent the oblique surfaces from shifting.

[0035] 6. During construction, due to the presence of inclined surfaces, if the formwork cannot guarantee verticality, misalignment will occur at the corners of the rectangular piers. This will prompt the construction unit to make timely corrections. The construction unit only needs to repair the surface of the pier. However, if it is not repaired in time and the pier is found to be tilted after construction is completed, it will cause greater safety hazards and require the entire pier to be recast, which will be more costly.

[0036] 7. Since the horizontal and vertical connectors are located on the outside of the formwork, the deformation of the formwork caused by uneven stress during demolding has little impact on the horizontal and vertical connectors, and thus has little impact on the verticality of the formwork in subsequent construction.

[0037] 8. In this scheme, during construction, the horizontal and vertical connectors mainly serve to ensure verticality, while the main force is borne by the diagonal tie rods. However, after repeated use, the diagonal tie rods will experience fatigue and reduced elasticity. During the casting of rectangular piers, they are more likely to elongate under stress, causing the beveled surfaces of adjacent formwork to not fit tightly together. This results in grout leaking between the beveled surfaces, alerting construction workers to problems with the verticality of the formwork and allowing for timely correction. Because the hollow holes and beveled surfaces are in continuous contact, even if grout leakage occurs during construction, the grout will flow directly through the hollow holes rather than adhering to the horizontal connectors. This prevents the horizontal connectors from deforming after the grout solidifies, thus ensuring the verticality of the formwork. Attached Figure Description

[0038] Figure 1 Flowchart for an embodiment;

[0039] Figure 2 A plan view of the 3D scanner used in this embodiment;

[0040] Figure 3 A three-dimensional isometric view of the template for an example;

[0041] Figure 4A three-dimensional isometric view of the reinforcing part in the embodiment;

[0042] Figure 5 This is an internal structural diagram of the reinforcing part after the oblique cut surface is hidden, as shown in the embodiment.

[0043] Figure 6 A three-dimensional isometric view of the horizontal connector in the embodiment;

[0044] Figure 7 A three-dimensional isometric view of the vertical connector in the embodiment;

[0045] Figure 8 This is a top view of the template for an embodiment;

[0046] Figure 9 for Figure 8 Enlarged view of point A;

[0047] Figure 10 This is a magnified view of the corner points when the template is tilted;

[0048] Figure 11 Enlarged view of the corner points of the template in the prior art;

[0049] Figure 12 A magnified view of the corner points when the template of the prior art is tilted;

[0050] Figure 13 Enlarged views of the template corner points, diagonal braces, and horizontal connectors in the embodiment;

[0051] Figure 14 Enlarged view of the template corner, diagonal tie rod, and horizontal connector in the embodiment when the tie rod is fatigued. Detailed Implementation

[0052] The following detailed description illustrates the specific implementation method:

[0053] The reference numerals in the accompanying drawings include: prism sphere 11, 3D scanner 12, rectangular pier 13, template 2, reinforcing part 21, oblique cut surface 22, stiffening plate 23, back rib 3, diagonal tie seat 31, diagonal tie rod 32, nut 33, horizontal connector 4, vertical connector 41, arc plate 42, hollow hole 43, vertical connector 5, horizontal connector 51, and support plate 52.

[0054] Example

[0055] The implementation examples are basically as follows Figure 1-14 As shown: A template pre-assembly method, the flowchart is as follows. Figure 1 As shown, it includes the following steps:

[0056] Step 1: Prepare the site, 3D model, eight formwork panels 2, and horizontal connectors 4. The site is a flat indoor area. The 3D model is a BIM (Building Information Model) model built based on the design drawings. Every four formwork panels 2 can enclose a rectangular pier 13. The eight formwork panels 2 can enclose two layers of formwork 2, including a first layer formwork 2 and a second layer formwork 2. Figure 3 and Figure 4 All are three-dimensional diagrams of two-layer template 2; in this embodiment, the inner side is the side closer to the bridge pier during construction, and the outer side is the side farther away from the bridge pier;

[0057] like Figure 3 and Figure 6 As shown, several horizontally arranged back ribs 3 are welded to the outside of the template 2, and a diagonal brace 31 is welded to each end of the back rib 3; as shown Figure 4 As shown, each template 2 has an integrally formed reinforcing part 21 on its left and right sides. The reinforcing part 21 is a vertically arranged isosceles right-angled triangular cross-section irregular tube. The inclined surface of the right-angled triangle forms a beveled surface 22, which is located on the inner side of the reinforcing part 21. After the sides of adjacent templates 2 are vertically spliced, the beveled surfaces 22 of the two reinforcing parts 21 are attached together, and the inclination angle of the beveled surfaces 22 is 45°. Figure 5 As shown, the reinforcing part 21 has several stiffening plates 23 spaced at equal intervals along its length.

[0058] Determine the planar position of template 2 on the site level. Set up several targets on the site level and use a total station to measure the coordinates of the targets. The targets include four planar points and six scanning points. The planar points are set at the four corners of the planar position of template 2, and the scanning points are arranged as follows: Figure 2 As shown, a prism sphere 11 is placed at the scanning point, which is the center of the prism sphere 11. The coordinates of the plane point and the scanning point on the plane are measured using a total station.

[0059] Step 2: Import the coordinates of the plane points and scanning points into the CAD drawing software, draw the plane points connecting the same side template 2 to obtain a CAD drawing with a site coordinate system, and then import the CAD drawing into the 3D software. The 3D modeling software is BIM modeling software. Import the 3D model according to the site coordinate system.

[0060] Step 3: Prepare the support components. Support the template 2 with the support components to form a rectangle. After adjacent templates 2 are vertically spliced, the beveled surfaces 22 of the two reinforcing parts 21 are attached together. Diagonal braces 32 and two nuts 33 are installed between the diagonal bracing seats 31 of adjacent templates 2. The two ends of the diagonal braces 32 pass through the two diagonal bracing seats 31 and are threaded to the two nuts 33. At this point, it is not necessary to tighten the nuts 33, thus completing the assembly of the first layer of template 2. Use a total station to measure the four corner points of template 2 for coarse adjustment. The coarse adjustment is done by adjusting the position of the support components. The support components can be objects such as steel pipes that can prevent template 2 from tipping over. In this embodiment, diagonal braces 32 have already been installed, serving as support components, and no other support components are needed.

[0061] Step 4, according to Figure 2 The measurement station of the 3D scanner 12 is set up. The coordinates of the center of the prism sphere 11 on the scanning point are measured by the 3D scanner 12. The field coordinate system is converted into the point cloud coordinate system, the point cloud data of template 2 is collected, and the point cloud model is established. When the point cloud data of template 2 is collected, other noise points are removed, and noise points generated during the scanning process are also removed, so as to obtain high-precision point cloud data of template 2.

[0062] Step 5: The 3D model and the point cloud model have the same coordinate system, so there is no need to register the two models. Compare the 3D deviations of the 3D model and the point cloud model to obtain the positional deviation of the coarse adjustment template 2. Tighten the nut 33 to connect the adjacent template 2 through the tie rod 32. The inclined surface 22 and the tie rod 32 are perpendicular to each other, so the inclined surface 22 is more tightly connected through the tie rod 32. At the same time, the tie rod 32 will not generate a component force parallel to the inclined surface 22, thus avoiding the relative sliding of the two inclined surfaces 22. Adjust the relative position of the adjacent template 2 by rotating the two nuts 33 to fine adjust the template 2 until the accuracy requirements are met.

[0063] Step Six: Connect horizontal connectors 4 in pairs using bolts, welding each pair of horizontal connectors 4 between adjacent templates 2. Figure 6 As shown, the horizontal connector 4 is welded to the outside of the reinforcing part 21. Each horizontal connector 4 includes a vertically arranged vertical connecting plate 41 and three horizontally arranged arc-shaped plates 42. Both ends of the arc-shaped plates 42 are welded to the outside of the reinforcing part 21 and the side of the vertical connecting plate 41, respectively. The side of the vertical connecting plate 41 away from the arc-shaped plate 42 is the connection surface of the two horizontal connectors 4. The connection surface of the two horizontal connectors 4 is coplanar with the chamfered surface 22 of the corresponding side of the reinforcing part 21. The connection surfaces of the two horizontal connectors 4 are aligned and connected by bolts. A hollow hole 43 is formed in the middle of the arc-shaped plates 42 on both sides of a set of horizontal connectors 4. The hollow hole 43 is in continuous contact with the chamfered surface 22.

[0064] After welding the arc-shaped plate 42 of the horizontal connector 4, erect the second layer of template 2, as follows. Figure 7 As shown, two vertical connectors 5 are welded to the upper and lower sides of the template 2 respectively. The back rib 3 can completely block the vertical connectors 5 on the lower side of the template 2. Each vertical connector 5 includes a horizontal connecting plate 51 and several vertically arranged triangular support plates 52. The support plates 52 are welded to the outer side of the template 2 and the side of the horizontal connecting plate 51 respectively. During on-site construction, when the upper and lower templates 2 are spliced, the horizontal connecting plates 51 of the upper and lower templates 2 are aligned and connected by bolts.

[0065] After multiple pre-assemblies, the instruments and equipment are periodically inspected. After inspection, steps one through six are repeated. Rectangular piers 13 are poured into formwork 2. After removing formwork 2, the corners of the rectangular piers 13 are checked for misalignment. If the verticality accuracy of formwork 2 is sufficient, then formwork 2... Figure 8 and Figure 9 As shown; if the verticality accuracy of template 2 is insufficient, then template 2 will be as follows. Figure 10 As shown, misalignment can easily occur. However, in existing technologies, if the verticality accuracy of template 2 is sufficient, template 2 will... Figure 11 As shown; if the verticality accuracy of template 2 is insufficient, then template 2 will be as follows. Figure 12 As shown, template 2 is not prone to misalignment, and therefore it is not easy to observe the tilt of template 2 with the naked eye.

[0066] The effect of a template pre-assembly method is as follows:

[0067] 1. By comparing the three-dimensional deviation of the point cloud model with the BIM model, the position and verticality of the template 2 are adjusted to improve the accuracy of the template 2 after leaving the factory and ensure the verticality of the template 2 after assembly. The template 2 is fixed by welding the horizontal connectors 4, and then the bolts between each set of horizontal connectors 4 are removed to disassemble the template 2 for transport to the site for assembly.

[0068] 2. By strengthening the rigidity of the side of the template 2 through the reinforcing part 21, the deformation of the template 2 during construction is reduced. Therefore, as long as the template 2 of the first layer is vertical, during subsequent construction, as long as the adjacent templates 2 are connected by the horizontal connector 4, the template 2 can be automatically calibrated for verticality, thereby reducing the deviation of the verticality of the template 2 during construction and reducing the amount of measurement and positioning work.

[0069] 3. Since the end of template 2 is a beveled surface 22, only two opposite templates 2 need to be fixed. The remaining two templates 2 can be aligned with the bolt holes by simply pushing them inward along the beveled surface 22, which is convenient and quick and improves construction efficiency.

[0070] 4. With the first-layer formwork 2 properly adjusted, the second-layer formwork 2 does not require adjustment using a total station. During the bolt tightening process, the vertical connecting plate 41 and the horizontal connecting plate 51 cause the two adjacent formworks 2 to slide simultaneously along the connecting surface, thus returning the formwork 2 to the designed vertical state. The verticality of the formwork 2 can be guaranteed solely by the vertical connecting pieces 5 and the horizontal connecting pieces 4 between the formworks 2, thereby greatly accelerating the construction speed of the bridge piers.

[0071] 5. Since the connecting surfaces of the two horizontal connectors 4 and the oblique cut surfaces 22 of the corresponding reinforcing parts 21 are coplanar, when the ends of the two templates 2 are relatively displaced along the oblique cut surfaces 22, the bolts on the connecting surfaces are perpendicular to the direction of movement, thereby maximizing the use of the shear resistance of the bolts to prevent the oblique cut surfaces 22 from shifting.

[0072] 6. During construction, due to the presence of the inclined surface 22, if the template 2 cannot guarantee verticality, misalignment will occur at the corner of the rectangular pier 13, thus reminding the construction unit to correct it in time. The construction unit only needs to repair the surface of the pier. However, if it is not repaired in time, and the pier is found to be tilted after construction is completed, it will cause greater safety hazards and require the entire pier to be recast, which will be more costly.

[0073] 7. Since the horizontal connector 4 and the vertical connector 5 are located on the outside of the template 2, the deformation of the template 2 caused by uneven force during demolding has little impact on the horizontal connector 4 and the vertical connector 5, and thus has little impact on the verticality of the template 2 in subsequent construction.

[0074] 8. During construction, the horizontal connector 4 and the vertical connector 5 mainly serve to ensure verticality, while the main force is borne by the diagonal tie rod 32. Under normal circumstances, the corner points of the formwork 2 are as follows: Figure 13 As shown, however, after repeated use, the tie rod 32 of template 2 will experience fatigue and reduced elasticity, making it more prone to elongation under stress during the casting of rectangular pier 13. Figure 14 As shown, the oblique cut surfaces 22 of adjacent templates 2 cannot fit tightly together, causing grout to leak out between the oblique cut surfaces 22. This alerts the construction personnel that there is a problem with the verticality of the template 2 and allows for timely correction. Since the hollow hole 43 and the oblique cut surface 22 are in continuous contact, even if grout leakage occurs during construction, the grout will leak out directly through the hollow hole 43, and the probability of it adhering to the horizontal connector 4 is relatively small. This prevents the horizontal connector 4 from deforming after the grout solidifies, thus ensuring the verticality of the template 2.

[0075] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A template pre-assembly method, characterized in that... This includes the following steps: Step 1: Prepare the site, 3D model, and several templates and horizontal connectors. Determine the planar position of the templates on the site and set up several targets on the site. Use a total station to measure the coordinates of the targets. Step 2: Import the target coordinates into the 3D software, and import the 3D model according to the target coordinate position; Step 3: Assemble the first-floor formwork and use a total station to measure the corner points of the formwork for rough adjustment; Step 4: Measure the target coordinates using a 3D scanner, convert the field coordinates into point cloud coordinates, collect point cloud data of the template, and establish a point cloud model. Step 5: Compare the 3D model and the point cloud model to identify 3D discrepancies and fine-tune the template accordingly; Step 6: Connect the horizontal connectors in pairs using bolts, and weld each pair of horizontal connectors between adjacent templates; In step one, the target includes several planar points and scanning points. The planar points are all set on the planar position of the template, and a prism sphere is placed on the scanning point. The scanning point is the center of the prism sphere. The coordinates of the planar points and scanning points on the planar position are measured using a total station. In step four, the target coordinates measured by the 3D scanner are the coordinates of the scanning point; The template has several back ribs on the outside, and each back rib has a diagonal brace at both ends. There are diagonal braces and two nuts between the diagonal braces of adjacent templates. The two ends of the diagonal braces pass through the two diagonal braces and are threaded to the two nuts. In step three, prepare the support components to support the template and form a rectangle, thus completing the assembly of the first-layer template; the coarse adjustment is done by adjusting the position of the support components. In step five, the fine-tuning method is as follows: connect adjacent templates with diagonal tie rods, and adjust the relative positions of adjacent templates by rotating two nuts; The template has a reinforcing section on each side, with a beveled surface on the inside of the reinforcing section and horizontal connectors on the outside of the reinforcing section. The reinforcing section is a special-shaped tube with a right-angled triangular cross section and a beveled surface of a right-angled triangle. Several stiffening plates are evenly spaced along the length of the reinforcing section. In step three, after the adjacent templates are vertically spliced, the beveled surfaces of the two reinforcing parts are pressed together; The horizontal connector includes a vertically arranged vertical connecting plate and several horizontally arranged arc-shaped plates. Both ends of the arc-shaped plates are connected to the outer side of the reinforcing part and the side of the vertical connecting plate, respectively. The side of the vertical connecting plate away from the arc-shaped plate is the connection surface of the two horizontal connectors, and the connection surface is connected by bolts. In step six, two horizontal connectors are used as a group, and two vertical connector plates are bolted together. The arc-shaped plates of the two horizontal connectors are then welded to the outer sides of the two adjacent templates.

2. The template pre-assembly method according to claim 1, characterized in that: In step six, after welding the horizontal connectors, the rectangular piers are poured into the formwork. After removing the formwork, check whether there is any misalignment at the corners of the rectangular piers.

3. The template pre-assembly method according to claim 1, characterized in that: In step six, after welding the arc-shaped plate of the horizontal connector, a second layer of template is erected. Vertical connectors are welded on the upper and lower sides of the template. The vertical connectors include a horizontal connector plate and several vertically arranged triangular support plates. The support plates connect the outer side of the reinforcing part and the side of the horizontal connector plate. The upper and lower templates are connected by the vertical connectors.

4. The template pre-assembly method according to claim 3, characterized in that: In step six, the back rib can completely block the vertical connectors on the lower side of the template, and a hollow hole is formed between the two arc-shaped plates at the same height of a set of horizontal connectors. The hollow hole and the beveled surface are in continuous contact.

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