Outer creeping formwork and inner supporting formwork steel and aluminum formwork combined construction method for core tube

Abstract

The invention provides an external climbing formwork and internal supporting formwork steel-aluminum formwork combined construction method for a core tube, and relates to the technical field of super high-rise core tube construction, which comprises the following steps: mounting an external climbing steel formwork on the outer side of a super high-rise core tube structure outer wall; aluminum formworks are installed on the inner side of the outer wall, the inner wall and the horizontal structure; the steel formwork and the aluminum formwork are spliced together, and pouring is conducted after fixing; after pouring of the upper layer concrete is completed and the formwork removing condition is met, the aluminum formwork is removed, and meanwhile the steel formwork is removed; the external climbing steel formwork climbs, after steel bars are bound on an operation layer, the steel formwork is closed, and an aluminum formwork is installed; according to the construction method, a system combining the inner steel formwork and the outer steel formwork is adopted, it is guaranteed that the vertical structure and the horizontal structure of the core tube can be constructed at the same time, the problems existing in core tube construction are solved, and meanwhile the construction quality of the core tube is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of super high-rise core tube construction, and in particular to a construction method combining an outer climbing formwork and an inner supporting formwork with steel and aluminum formwork for a core tube. Background Art

[0002] In today's construction industry, with the acceleration of urbanization and the increasing scarcity of land resources, the construction of supertall towers has gradually become a key component of city skylines. These towers are not only breathtakingly tall but also structurally complex, placing extremely high demands on construction technology. In the construction of the core tubes of supertall towers, the method of constructing the vertical structure before the horizontal structure, particularly the use of top formwork technology to precede the core tube wall construction, has become a mainstream practice.

[0003] Top formwork technology, with its unique advantages, such as its climbing being independent of the concrete strength of the working layer, significantly improved the construction progress of the core wall. However, this construction method is not perfect and has exposed a series of shortcomings in actual application.

[0004] First, the delayed construction of horizontal structures is a major drawback of existing technologies. Because vertical structures are constructed first, the construction of horizontal structures (such as floor slabs and beams) is often postponed to a later stage. This delayed construction not only affects the coordination of the overall construction schedule but can also lead to irrational structural stress conditions, increasing construction risks.

[0005] Secondly, the increased pressure on safety and security is another issue that cannot be ignored with existing technologies. When vertical structures are constructed first, the work surface is often cantilevered at high altitudes, significantly increasing the difficulty and complexity of safety and security measures. This increases the safety risks faced by construction workers and also presents greater challenges for on-site safety management.

[0006] Another significant drawback of existing technology is the chaotic nature of construction on the working floor. Due to the asynchronous construction sequence of vertical and horizontal structures, multiple types of work often overlap on the working floor, leading to chaotic material stacking. This not only impacts site cleanliness and work efficiency but can also lead to safety incidents and quality issues.

[0007] These shortcomings stem primarily from the irrational sequencing of vertical and horizontal structural construction within existing construction techniques. While prioritizing vertical construction can expedite the core wall construction process, it neglects the importance and coordination of horizontal structural construction. Furthermore, existing technologies also lack safety precautions for aerial work and the organizational management of working-level construction.

[0008] Therefore, in response to these shortcomings of the prior art, the purpose of the present invention is to provide a more reasonable, efficient and safe method for the construction of the core tube of a super high-rise tower, so as to overcome the shortcomings of the prior art, improve construction efficiency and quality, reduce construction risks and costs, and at the same time improve the quality and efficiency of the core tube construction. Summary of the Invention

[0009] An embodiment of the present invention provides a construction method for a core tube using a combination of external climbing formwork and internal supporting formwork steel-aluminum formwork. By adopting a system combining internal and external steel-aluminum formwork, it ensures that the vertical and horizontal structures of the core tube can be constructed simultaneously, solving the problems existing in the above-mentioned core tube construction.

[0010] In view of the above problems, the technical solution proposed by the present invention is: A construction method for combining an outer climbing formwork and an inner supporting formwork with a steel-aluminum formwork for a core tube includes the following steps: Install external climbing steel formwork on the outer side of the outer wall of the super high-rise core tube structure; Install aluminum formwork on the inside of exterior walls, interior walls and horizontal structures; Splice the steel formwork and the aluminum formwork together, wherein the outer corners of the steel formwork and the aluminum formwork are connected by outer corner strips, and then cast after being fixed; After the upper concrete pouring is completed and the conditions for demoulding are met, the aluminum formwork is removed and the steel formwork is withdrawn at the same time; The external climbing steel formwork is raised, and after the steel bars are tied on the working layer, the steel formwork is closed and the aluminum formwork is installed; Splice the steel formwork and the aluminum formwork together, wherein the outer corners of the steel formwork and the aluminum formwork are connected by outer corner strips, and then cast after being fixed; Repeat the above steps until the construction is completed.

[0011] In order to better implement the technical solution of the present invention, the following technical measures are also adopted.

[0012] Furthermore, the installation of steel formwork and aluminum formwork includes the following steps: Confirm the number and size of the intersections between the steel formwork and the aluminum formwork according to the construction drawings; Make corresponding external corner strips according to the number and size of the external corner intersections; During the splicing process of steel formwork and aluminum formwork, install external corner strips at the intersection of external corners; Locking the locks on the back ribs of steel and aluminum formwork; Adjust the gap between the external corner strip and the lock to ensure close contact between the back rib, lock, external corner strip, steel formwork and aluminum formwork.

[0013] Furthermore, the external angle strip includes a triangular tube, the inclined side wall of the triangular tube has a long hole, and a tensioning structure is provided inside the triangular tube to interfere with the lock through the long hole. The side edge of the outer surface of the triangular tube close to the right-angle side wall has an installation groove, and a seal is detachably installed inside it.

[0014] Furthermore, the sealing member includes a rubber strip to which the insertion rod is fixed.

[0015] Furthermore, the installation of steel formwork and aluminum formwork also includes the following steps: Apply release agent to the rubber strip of the seal; Insert the seal into the interior of the mounting groove; Insert the external corner strip into the intersection of the external corners of the steel formwork and the aluminum formwork; The rubber strip is clamped during the assembly of steel formwork and aluminum formwork.

[0016] Furthermore, the tensioning structure includes a pushing slider and a tensioning strip that is in contact with it, wherein the back of the tensioning strip is in contact with the right-angle side wall of the triangular tube, the front of the tensioning strip is in contact with the back of the pushing slider, and the front of the pushing slider is arranged inside the long hole.

[0017] Furthermore, the pushing slider includes a push block arranged inside the long hole, and a circle of flange is provided outwardly at the edge of one side of the back of the push block to limit the position of the push block and prevent it from falling out of the long hole. There are several arc-shaped protrusions arranged at equal intervals on the back of the push block.

[0018] Furthermore, the tensioning strip includes a rod, wherein the shape of the back of the rod is consistent with the shape of the right-angled side wall of the triangular tube, a column is provided at the top of the rod, and a plurality of arc-shaped grooves adapted to the shape of the arc-shaped protrusions are provided on the front of the rod, and a raised structure is formed at the edge of the arc-shaped groove close to one side of the column.

[0019] Furthermore, the front of the tensioning strip can slide on the back of the pushing slider. During the assembly process of the steel formwork and the aluminum formwork, the arc groove and the arc protrusion are in a coaxial state. During the process of adjusting the gap between the external angle strip and the lock, the arc groove and the arc protrusion are in an eccentric state. At this time, the protruding structure runs away from the column.

[0020] Compared with the existing technology, the beneficial effect of the present invention is: by using external climbing steel formwork on the outside of the outer wall of the super-high-rise core tube structure, and using aluminum formwork on the inside of the outer wall, inner wall and horizontal structure, by adopting this system combining internal and external steel and aluminum formwork, it is ensured that the vertical and horizontal structures of the core tube can be constructed simultaneously, solving the current problems of delayed construction of the horizontal structure, high safety protection pressure, and chaotic construction on the working layer in the core tube construction.

[0021] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a flow chart of a construction method for combining an outer climbing formwork and an inner supporting formwork with steel and aluminum formwork for a core tube disclosed in an embodiment of the present invention; Figure 2 This is a schematic diagram of the existing template external corner connection structure; Figure 3 This is a schematic diagram of the template external corner connection structure disclosed in an embodiment of the present invention; Figure 4 A schematic structural diagram of a positive angle strip disclosed in an embodiment of the present invention; Figure 5 for Figure 4 A magnified schematic diagram of the local structure; Figure 6 for Figure 4 Schematic diagram of the structure of the middle push slider; Figure 7 for Figure 4 Schematic diagram of the structure of the middle tension bar; Figure 8 Schematic diagram of different states of the push slider and the tensioning strip disclosed in an embodiment of the present invention; Figure 9 A schematic diagram of an installation position structure of a positive angle strip and a template disclosed in an embodiment of the present invention (the push block does not extend from the long hole); Figure 10 This is a schematic diagram of another installation position structure of the external corner strip and the template disclosed in an embodiment of the present invention (the push block extends from the long hole and interferes with the lock).

[0023] Figure numerals: 1, template; 2, back rib; 3, lock; 4, external angle bar; 41, triangular tube; 41a, long hole; 41b, right-angle side wall; 41c, inclined side wall; 41d, mounting groove; 42, tensioning structure; 421, push slider; 421a, push block; 421b, flange; 421c, arc-shaped protrusion; 422, tensioning strip; 422a, column; 422b, bar; 422c, arc-shaped groove; 422d, raised structure; 43, seal; 431, plug rod; 432, rubber strip. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] The shortcomings of the current vertical structure-before-horizontal structure construction process used in the core tube construction of super-high-rise towers can be summarized as follows: (1) Delayed construction of horizontal structures.

[0026] (2) The pressure of safety protection increases.

[0027] (3) The construction on the working layer is rather chaotic.

[0028] The reason for this problem is that the segmented construction process results in the construction sequence of the vertical structure and the horizontal structure being out of sync, which causes the above-mentioned problem.

[0029] In order to solve the above problems, in view of the current core tube construction of super high-rise towers, the present invention proposes a construction method for the core tube that combines external climbing formwork and internal supporting formwork with steel and aluminum formwork. During the construction of the core tube of a super high-rise tower, the vertical structure and the horizontal structure can be constructed simultaneously.

[0030] in, The external climbing steel formwork adopts the climbing formwork system in the existing technology. The core tube formwork of the super high-rise office building adopts the external climbing and internal supporting steel-aluminum composite formwork system (a composite formwork system of steel formwork + aluminum formwork). The climbing formwork has two layers of structure hanging vertically downward and two layers of structure extending upward. The climbing formwork itself has a total of six layers, two layers of upper steel bar binding, one layer of concrete pouring, one layer of climbing frame lifting operation, and two layers of concrete defect repair.

[0031] The integrated electric climbing formwork system includes the formwork system, load-bearing system, climbing system, formwork opening and closing traction system, and intelligent control system. The formwork system comprises the formwork and scaffolding (upper platform). The load-bearing system comprises a working platform consisting of wall-mounted supports, a support frame, and horizontal trusses. The climbing system includes wall-mounted supports, guide rails, and power equipment. The formwork opening and closing traction system includes slide rails, pulleys, vertical fine-tuning devices, and traction power equipment. The intelligent control system includes a gravity sensor, synchronization controller, and remote control safety device.

[0032] The aluminum formwork adopts the aluminum alloy formwork support technology in the existing technology. The aluminum formwork referred to in this invention refers to aluminum alloy formwork. The horizontal structure (beams, slabs, stairs, etc.) in the core tube of the tower adopts aluminum formwork, which mainly includes wall, beam and slab and stair formwork support.

[0033] like Figure 1 As shown, the present invention proposes a construction method for combining outer climbing formwork and inner supporting formwork with steel and aluminum formwork for a core tube, comprising the following steps: S1, install external climbing steel formwork on the outer side of the outer wall of the super high-rise core tube structure; S2, install aluminum formwork on the inner side of the exterior wall, interior wall and horizontal structure; S3, splicing the steel formwork and the aluminum formwork together, wherein the outer corners of the steel formwork and the aluminum formwork are connected by outer corner strips, and then poured after being fixed; S4, after the upper layer of concrete pouring is completed and the formwork removal conditions are met, the aluminum formwork is removed and the steel formwork is withdrawn; S5, the external climbing steel formwork is raised, after the steel bars are tied on the working layer, the steel formwork is closed and the aluminum formwork is installed; S6, splicing the steel formwork and the aluminum formwork together, wherein the outer corners of the steel formwork and the aluminum formwork are connected by outer corner strips, and then poured after being fixed; S7, repeat the above steps until the construction is completed.

[0034] In the above step S3, in the prior art, the steel formwork and the aluminum formwork are spliced ​​together by using angle aluminum or C-channel for connection, such as Figure 2 As shown, the specific process of connection is: use the openings on the steel formwork and the aluminum formwork as well as the openings on the angle aluminum or C-slot to connect with bolts.

[0035] Due to the inconsistent sizes of the steel formwork and the aluminum formwork, hole position deviation problems will occur during the installation process, making installation difficult. At the same time, the joints at the intersection of the steel formwork and the aluminum formwork's external corners are difficult to keep completely sealed, and slight leakage is prone to occur after pouring concrete, resulting in poor quality of the external corner after pouring.

[0036] In this regard, the present invention has made improvements in the step of assembling the steel formwork and the aluminum formwork, and the installation of the steel formwork and the aluminum formwork also includes the following steps: Confirm the number and size of the intersections between the steel formwork and the aluminum formwork according to the construction drawings; Make corresponding external corner strips 4 according to the number and size of the external corner intersections; During the splicing process of steel formwork and aluminum formwork, install the external corner strip 4 at the intersection of the external corners, such as Figure 3 As shown; Lock the lock 3 on the steel template and the aluminum template back rib 2, as shown Figure 3 As shown; Adjust the gap between the external corner strip 4 and the lock 3 so that the back rib 2, lock 3, external corner strip 4, steel formwork and aluminum formwork are in close contact.

[0037] like Figure 3 As shown, the external angle bar 4 is used to replace the existing angle aluminum or C-channel to connect the steel formwork and the aluminum formwork at the external corner, which has the following advantages: 1. When assembling the steel formwork and the aluminum formwork, the seal 43 of the external corner strip 4 can seal the joint at the intersection of the steel formwork and the aluminum formwork external corner, avoiding leakage during the concrete pouring process and maintaining the quality of the external corner after pouring.

[0038] 2. No bolts are required to connect the external angle strip 4 and the template 1 (steel template, aluminum template). Not only is the disassembly and assembly speed fast, but it is also suitable for the connection between templates 1 (steel template, aluminum template) of different sizes, has a wide range of adaptability, and is easy to use.

[0039] like Figure 4 As shown, the external angle strip 4 includes a triangular tube 41, the inclined side wall 41c of the triangular tube 41 has a long hole 41a, and a tensioning structure 42 is provided inside the triangular tube 41 to interfere with the lock 3 through the long hole 41a. The side edge of the outer surface of the triangular tube 41 close to the right-angle side wall 41b has an installation groove 41d, and a seal 43 is detachably installed inside it.

[0040] The sealing member 43 includes an insert rod 431 and a rubber strip 432 fixed thereto. Figure 5 As shown, the installation process of steel formwork and aluminum formwork includes the following steps: Apply a release agent to the rubber strip 432 of the sealing member 43; Insert the seal 43 into the interior of the mounting groove 41d; Insert the external corner strip 4 into the intersection of the external corner of the steel formwork and the aluminum formwork; During the assembly of the steel formwork and the aluminum formwork, the rubber strip 432 is clamped. Figure 9 shown.

[0041] The cross-sectional shape of the triangular tube 41 is a right triangle. Figures 9 and 10 As shown, the right-angle side wall 41b of the triangular tube 41 is two mutually perpendicular side walls where the right-angle side of the triangular tube 41 is located, and the inclined side wall 41c is the side wall where the inclined side of the triangular tube 41 is located.

[0042] like Figures 9 and 10 As shown, the process of installing the external corner strip 4 (the external corner strip 4 is connected to the aluminum formwork and the steel formwork respectively) includes the following steps: Insert the external corner strip 4 into the external corner assembly of the steel formwork and the aluminum formwork; Steel formwork and aluminum formwork clamp the rubber strip 432; Lock the lock 3 on the back rib 2 (composed of a locking mechanism and a connecting rod, with the two locking mechanisms installed on the back ribs 2 of the steel formwork and the aluminum formwork respectively); By striking the upright post 422a on the tensioning strip 422, the tensioning strip 422 moves in the striking direction. Figure 8 As shown, the pushing slider 421 is gradually pushed out of the long hole 41a and comes into contact with the lock 3 (at this time, the right-angle surface of the external angle strip 4 is in close contact with the steel formwork and the aluminum formwork. At the same time, as the lock 3 is tightened, the steel formwork and the aluminum formwork extrude the rubber strip 432 to form a complete sealing structure, achieving the effect of not needing to use bolts to connect the external angle strip 4 and the formwork 1 and the effect of sealing the joint between the steel formwork and the aluminum formwork).

[0043] like Figures 6 and 7 As shown, the tensioning structure 42 includes a pushing slider 421 and a tensioning strip 422 that is in contact with it, wherein the back of the tensioning strip 422 is in contact with the right-angle side wall 41b of the triangular tube 41, and the front of the tensioning strip 422 is in contact with the back of the pushing slider 421, and the front of the pushing slider 421 is arranged inside the long hole 41a.

[0044] like Figure 6 As shown, the pushing slider 421 includes a pushing block 421a arranged inside the long hole 41a, and a circle of flange 421b is provided outwardly at the edge of one side of the back side of the pushing block 421a to limit the position of the pushing block 421a to prevent it from falling out of the long hole 41a. There are several arc-shaped protrusions 421c arranged at equal intervals on the back side of the pushing block 421a.

[0045] The size of the flange 421b is larger than that of the long hole 41a, that is, the push block 421a can pass through the long hole 41a, but the flange 421b cannot pass through the long hole 41a, thereby limiting the movement position of the push block 421a.

[0046] like Figure 7 As shown, the tensioning strip 422 includes a bar 422b, wherein the shape of the back of the bar 422b is consistent with the shape of the right-angled side wall 41b of the triangular tube 41, a column 422a is provided at the top of the bar 422b, and a plurality of arc-shaped grooves 422c that are adapted to the shape of the arc-shaped protrusion 421c are provided on the front of the bar 422b, and a protruding structure 422d is formed at the edge of the arc-shaped groove 422c close to the side of the column 422a.

[0047] like Figure 8 As shown, the front of the tensioning strip 422 can slide on the back of the pushing slider 421. During the assembly process of the steel template and the aluminum template, the arc groove 422c and the arc protrusion 421c are in a coaxial state. During the process of adjusting the gap between the external angle strip 4 and the lock 3, the arc groove 422c and the arc protrusion 421c are in an off-axis state. At this time, the protruding structure 422d runs in the direction away from the column 422a.

[0048] As the column 422a is subjected to impact force, the arc-shaped groove 422c on the tensioning strip 422 and the arc-shaped protrusion 421c on the pushing slider 421 gradually change from a coaxial state to an eccentric state (the protruding structure 422d slides along the surface of the arc-shaped protrusion 421c). During this process, the distance h1 between the tensioning strip 422 and the pushing slider 421 in the coaxial state gradually increases to h2. At this time, the pushing block 421a of the pushing slider 421 is pushed out of the long hole 41a and conflicts with the lock 3.

[0049] During the dismantling process, the fixed state between the external corner strip 4 and the lock 3 can be loosened by knocking the bar 422b in the opposite direction or using the column 422a to pull out the tensioning bar 422, and the template 1 can be removed to take out the external corner strip 4 according to the normal construction sequence.

[0050] The present invention adopts external climbing steel formwork on the outer side of the outer wall of the super-high-rise core tube structure, and adopts aluminum formwork on the inner side of the outer wall, inner wall and horizontal structure. By adopting this system of combined internal and external steel and aluminum formwork, it ensures that the vertical and horizontal structures of the core tube can be constructed simultaneously, and solves the problems of delayed construction of horizontal structure, high safety protection pressure, and chaotic construction on the working layer in the current core tube construction. At the same time, in the process of splicing aluminum formwork and steel formwork, the existing splicing method is improved, which can increase the speed of formwork disassembly and assembly during the construction of the super-high-rise core tube, and can also effectively improve the forming quality of the splicing of the external corners of the aluminum formwork and the steel formwork. The improvement of the above-mentioned splicing method effectively improves the construction quality of the combined construction method of external climbing formwork and internal supporting formwork, steel and aluminum formwork for the core tube proposed by the present invention.

[0051] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A construction method for combining outer climbing formwork and inner supporting formwork with steel and aluminum formwork for a core tube, characterized in that: The following steps are involved: Install external climbing steel formwork on the outer side of the outer wall of the super high-rise core tube structure; Install aluminum formwork on the inside of exterior walls, interior walls and horizontal structures; Splicing the steel formwork and the aluminum formwork together, wherein the outer corners of the steel formwork and the aluminum formwork are connected by outer corner strips (4), and then poured after being fixed; After the upper concrete pouring is completed and the demoulding conditions are met, the aluminum formwork is removed and the steel formwork is withdrawn; The external climbing steel formwork is raised, and after the steel bars are tied on the working layer, the steel formwork is closed and the aluminum formwork is installed; Splicing the steel formwork and the aluminum formwork together, wherein the outer corners of the steel formwork and the aluminum formwork are connected by outer corner strips (4), and then poured after being fixed; Repeat the above steps until the construction is completed.

2. The method according to claim 1, characterized in that: The installation of steel formwork and aluminum formwork includes the following steps: Confirm the number and size of the intersections between the steel formwork and the aluminum formwork according to the construction drawings; According to the number and size of the intersections of the external corners, corresponding external corner strips (4) are made; During the splicing process of the steel formwork and the aluminum formwork, a positive angle strip (4) is installed at the intersection of the positive angles; Locking device (3) on the back rib (2) of the steel formwork and the aluminum formwork; The gap between the external angle strip (4) and the lock (3) is adjusted so that the back rib (2), the lock (3), the external angle strip (4), the steel formwork, and the aluminum formwork are in close contact with each other.

3. The method according to claim 2, characterized in that: The external angle strip (4) comprises a triangular tube (41), the inclined side wall (41c) of the triangular tube (41) having a long hole (41a), a tensioning structure (42) being arranged inside the triangular tube (41) and contacting with the lock (3) through the long hole (41a), and a side edge of the outer surface of the triangular tube (41) close to the right-angle side wall (41b) having a mounting groove (41d), inside which a sealing member (43) is detachably mounted.

4. The method according to claim 3, characterized in that: The sealing member (43) comprises an insertion rod (431) and a rubber strip (432) fixing the insertion rod (431) thereto.

5. The method according to claim 4, characterized in that: The installation of steel formwork and aluminum formwork also includes the following steps: Apply a release agent to the rubber strip (432) of the sealing member (43); Insert the sealing member (43) into the interior of the mounting groove (41d); Insert the external corner strip (4) into the intersection of the external corners of the steel formwork and the aluminum formwork; The rubber strip (432) is clamped during the assembly of the steel formwork and the aluminum formwork.

6. The method according to claim 3, characterized in that: The tensioning structure (42) comprises a pushing slider (421) and a tensioning strip (422) abutting against the pushing slider (421), wherein the back surface of the tensioning strip (422) abuts against the right-angle side wall (41b) of the triangular tube (41), the front surface of the tensioning strip (422) abuts against the back surface of the pushing slider (421), and the front surface of the pushing slider (421) is arranged inside the long hole (41a).

7. The method according to claim 6, characterized in that: The push slider (421) comprises a push block (421a) arranged inside the long hole (41a), a flange (421b) is provided outwardly at the edge of one side of the back side of the push block (421a) to limit the position of the push block (421a) to prevent it from slipping out of the long hole (41a), and a plurality of arc-shaped protrusions (421c) are arranged at equal intervals on the back side of the push block (421a).

8. The method according to claim 7, characterized in that: The tensioning strip (422) comprises a bar (422b), wherein the shape of the back side of the bar (422b) is consistent with the shape of the right-angle side wall (41b) of the triangular tube (41), a column (422a) is provided on the top of the bar (422b), and a plurality of arc-shaped grooves (422c) matching the shape of the arc-shaped protrusion (421c) are provided on the front side of the bar (422b), and a protruding structure (422d) is formed at the edge of the arc-shaped groove (422c) on one side close to the column (422a).

9. The method according to claim 8, characterized in that: The front side of the tensioning strip (422) can slide on the back side of the push slider (421); during the assembly process of the steel template and the aluminum template, the arc-shaped groove (422c) and the arc-shaped protrusion (421c) are in a coaxial state; during the adjustment of the gap between the external angle strip (4) and the lock (3), the arc-shaped groove (422c) and the arc-shaped protrusion (421c) are in an off-axis state, and at this time, the protruding structure (422d) moves in a direction away from the column (422a).

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