Corrugated steel arch form
Patent Information
- Application Number
- CN202521731997.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-14
- Publication Date
- 2026-10-23
- Estimated Expiration
- 2035-08-14
AI Technical Summary
[0004]本实用新型的目的在于提供一种波纹钢拱模板，以解决现有技术中存在的支撑结构承载性能不足且模板易发生形变，同时支撑结构拆装操作复杂而难以重复使用的技术问题
[0015]本实用新型提供的波纹钢拱模板的有益效果在于：与现有技术相比，本实用新型波纹钢拱模板，操作时，先组装该波纹钢拱模板，在拱形波纹板的外侧波谷中固定安装多个支撑筋板，并使支撑筋板上的支撑面与拱形波纹板的外侧波峰相平齐；然后再将弧形板沿拱形波纹板外侧面铺设并通过焊接或螺栓固定，且弧形板的内侧直接抵接于支撑筋板的支撑面上，以形成整个的波纹钢拱模板；最后整个波纹钢拱模板移动至涵洞区域，并将拱形波纹板的两端通过可拆卸的连接方式固定于两个基础底座上方，形成整体支撑框架。通过这种结构，借助波纹结构大幅提升整体承载性能，而在弧形板与拱形波纹板和支撑筋板的作用下，避免浇筑面因模板形变出现凹凸。在涵洞等浇筑操作完成后，待混凝土强度达到设计拆模标准后，拆除拱形波纹板与基础底座的连接后，即可直接移动整个波纹钢模板以实现快速地重复利用。
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Figure CN224885569U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of corrugated steel technology, and more specifically, it relates to a corrugated steel arch template. Background Technology
[0002] In underground and geotechnical engineering construction such as tunnels and culverts, the supporting structure is a core facility for ensuring the quality of concrete pouring and construction safety. The supporting structure bears the dual burden of surrounding rock pressure, the concrete's own weight, and construction loads, while the formwork above the supporting structure acts as the mold for concrete forming, directly determining the geometric accuracy and surface quality of the lining structure. The two work together to complete the concrete pouring operation. Once the concrete strength reaches the design demolding standard, the inner formwork is removed for reuse.
[0003] Currently, the support structures widely used in engineering mainly include steel supports, wooden supports, and portal frames. Traditional steel supports are mostly made of spliced steel sections, which have insufficient overall load-bearing capacity; the formwork is prone to deformation, resulting in uneven pouring surfaces; and the disassembly and dismantling of the support structure are relatively cumbersome, making it impossible to reuse it quickly. Utility Model Content
[0004] The purpose of this utility model is to provide a corrugated steel arch formwork to solve the technical problems of insufficient load-bearing capacity of the support structure, easy deformation of the formwork, and complicated disassembly and assembly operations of the support structure, making it difficult to reuse.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a corrugated steel arch formwork, comprising: An arched corrugated plate is used for installation within the culvert area and above the culvert's foundation base; both ends of the arched corrugated plate are detachably connected to two foundation bases respectively. An arc-shaped plate is fitted onto the outer surface of the arched corrugated plate; the arc-shaped plate is fixedly connected to the arched corrugated plate. Multiple supporting stiffeners are fixedly installed in the outer troughs of the arched corrugated plate; each supporting stiffener has a supporting surface that connects to the arc-shaped plate.
[0006] In one possible implementation, there are multiple arched corrugated plates arranged sequentially along the axial direction; each arched corrugated plate has a circumferential flange on both sides, and the circumferential flanges on two adjacent arched corrugated plates are mated and fixedly connected using fasteners.
[0007] In one possible implementation, the upper end of the circumferential flange is provided with an outwardly extending protruding connecting portion, and the protruding connecting portion is higher than the outer crest of the arched corrugated plate; the height difference between the upper end of the protruding connecting portion and the outer crest of the arched corrugated plate is equal to the thickness of the arc plate; the arc plate is fixedly connected to the protruding connecting portion and the crest of the arched corrugated plate.
[0008] In one possible implementation, a gasket is provided between the two circumferential flanges, and the upper end of the gasket is flush with the upper end of the circumferential flange.
[0009] In one possible implementation, the plurality of supporting stiffeners are divided into multiple groups and are respectively installed in multiple troughs of the arched corrugated plate; the plurality of supporting stiffeners in the same group are arranged at intervals along the circumference of the arched corrugated plate.
[0010] In one possible implementation, the support surface is an arc surface adapted to the inner side of the arc plate.
[0011] In one possible implementation, the outer side of the supporting stiffener is fixedly connected to the arched corrugated plate, and a U-shaped reinforcing plate is fixedly provided on the side of the supporting stiffener away from the supporting surface. The outer side of the U-shaped reinforcing plate has an arc-shaped surface that engages with the trough of the arched corrugated plate.
[0012] In one possible implementation, the U-shaped reinforcing plate is provided with a number of reinforcing rods to increase bending strength.
[0013] In one possible implementation, the corrugated steel arch formwork further includes several threaded rods for prefabrication and installation on the foundation base. The ends of the arched corrugated plate are provided with end flanges, which are mated to the foundation base and connected to the threaded rods, and are fixedly connected using locking devices.
[0014] In one possible implementation, the corrugated steel arch formwork further includes an inclined bearing surface disposed on the upper end of the foundation base, wherein one end of the inclined bearing surface near the center of the arched corrugated plate is higher than the end away from the center of the arched corrugated plate; the bolt is arranged through the inclined bearing surface, and the end flange is butt-connected to the inclined bearing surface.
[0015] The beneficial effects of the corrugated steel arch formwork provided by this utility model are as follows: Compared with the prior art, the corrugated steel arch formwork of this utility model, during operation, is first assembled. Multiple supporting stiffeners are fixedly installed in the outer troughs of the arched corrugated plate, ensuring the supporting surfaces of the stiffeners are flush with the outer crests of the arched corrugated plate. Then, curved plates are laid along the outer side of the arched corrugated plate and fixed by welding or bolts, with the inner side of the curved plates directly abutting against the supporting surfaces of the stiffeners to form the entire corrugated steel arch formwork. Finally, the entire corrugated steel arch formwork is moved to the culvert area, and the two ends of the arched corrugated plate are fixed to two foundation bases via detachable connections, forming an overall support frame. This structure significantly improves the overall load-bearing capacity through the corrugated structure, while the combined effect of the curved plates, arched corrugated plates, and supporting stiffeners prevents unevenness on the pouring surface due to formwork deformation. After the culvert and other pouring operations are completed and the concrete strength reaches the design demolding standard, the connection between the arched corrugated plate and the foundation base is removed, and the entire corrugated steel formwork can be moved directly to achieve rapid reuse. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 A schematic diagram illustrating the usage state of the corrugated steel arch formwork provided in this embodiment of the utility model; Figure 2 A schematic diagram showing the connection of the arched corrugated plate and the arc plate provided in the embodiments of this utility model; Figure 3 A schematic diagram of the connection between two adjacent circumferential flanges provided in an embodiment of this utility model; Figure 4 A structural schematic diagram of the arched corrugated plate, the arc plate, and the supporting stiffener provided in the embodiments of this utility model; Figure 5 for Figure 1 Enlarged view of point A in the middle.
[0018] The following are the labeling elements in the figure: 10. Arched corrugated plate; 11. Circumferential flange; 12. Fastener; 13. Sealing gasket; 14. End flange; 15. Protruding connection part; 20. Arc plate; 30. Support rib plate; 31. Support surface; 32. U-shaped reinforcing plate; 33. Reinforcing rod; 40. Screw; 41. Locking part; 42. Inclined bearing surface; 50. Foundation base; 60. Culvert. Detailed Implementation
[0019] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0020] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.
[0021] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0023] Please see Figures 1 to 5 The corrugated steel arch formwork provided by this utility model will now be described. A corrugated steel arch formwork includes an arched corrugated plate 10, an arc-shaped plate 20, and supporting stiffeners 30. The arched corrugated plate 10 is used to be installed in the area of the culvert 60 and is located above the foundation base 50 of the culvert 60. The two ends of the arched corrugated plate 10 are detachably connected to two foundation bases 50 respectively. The arc-shaped plate 20 is fitted and installed on the outer side of the arched corrugated plate 10. The arc-shaped plate 20 is fixedly connected to the arched corrugated plate 10. There are multiple supporting stiffeners 30, which are fixedly installed in the outer trough of the arched corrugated plate 10. The supporting stiffeners 30 have a supporting surface 31 that is connected to the arc-shaped plate 20.
[0024] Compared with the prior art, the corrugated steel arch formwork provided by this utility model is an organic whole composed of an arched corrugated plate 10, an arc plate 20, and supporting stiffeners 30. The arched corrugated plate 10 serves as a basic load-bearing component, utilizing the mechanical properties of the corrugated structure to disperse the surrounding rock pressure, concrete self-weight, and construction load. Its two ends are detachably connected to the foundation base 50, ensuring installation stability and providing convenience for later disassembly and reuse. The arc plate 20 is tightly fitted to the outer side of the arched corrugated plate 10 and fixedly connected, serving as the direct forming surface of the concrete. Through rigid fixing, it avoids the deformation problem caused by unstable support in traditional formwork, ensuring the geometric dimensional accuracy and surface flatness of the lining structure. Multiple supporting stiffeners 30 are precisely embedded in the outer troughs of the arched corrugated plate 10, and their specially designed support surfaces 31 are firmly connected to the arc plates 20, forming a three-dimensional force system.
[0025] During operation, the corrugated steel arch formwork is first assembled. Multiple supporting stiffeners 30 are fixedly installed in the outer troughs of the arched corrugated plate 10, ensuring the supporting surfaces 31 of the stiffeners 30 are flush with the outer crests of the arched corrugated plate 10. Then, the arc-shaped plate 20 is laid along the outer side of the arched corrugated plate 10 and fixed by welding or bolts, with the inner side of the arc-shaped plate 20 directly abutting against the supporting surfaces 31 of the stiffeners 30, thus forming the entire corrugated steel arch formwork. Finally, the entire corrugated steel arch formwork is moved to the culvert 60 area, and the two ends of the arched corrugated plate 10 are fixed to the two foundation bases 50 via detachable connections, forming an overall support frame. This structure significantly improves the overall load-bearing capacity through the corrugated structure, while the combined effect of the arc-shaped plate 20, the arched corrugated plate 10, and the supporting stiffeners 30 prevents unevenness on the pouring surface due to formwork deformation. After the culvert 60 and other pouring operations are completed, once the concrete strength reaches the design demolding standard, the connection between the arched corrugated plate 10 and the foundation base 50 is removed, and the entire corrugated steel formwork can be moved directly to achieve rapid reuse.
[0026] Please see Figure 1 , Figure 2 and Figure 4As a specific embodiment of the corrugated steel arch formwork provided by this utility model, there are multiple arched corrugated plates 10 arranged sequentially along the axial direction; each arched corrugated plate 10 has a circumferential flange 11 on both sides, and the circumferential flanges 11 on two adjacent arched corrugated plates 10 are joined together and fixedly connected using fasteners 12; multiple arched corrugated plates 10 are arranged sequentially along the axial direction, each arched corrugated plate 10 is equipped with a circumferential flange 11 on both sides, and adjacent arched corrugated plates 10 are joined together by the circumferential flanges 11 and fixed with fasteners 12. This structural design allows the formwork to flexibly adjust the assembly quantity according to the length of the culvert 60, breaking through the limitations of traditional integral formwork on project dimensions. The circumferential flange 11, as a connection node, transmits load through surface contact, avoiding the stress concentration problem of traditional steel splicing, and forms a rigid whole with the fasteners 12, further strengthening the structure's resistance to deformation. In operation, only the corresponding number of arched corrugated plates 10 need to be selected according to project requirements, and the assembly is completed by precisely joining the circumferential flanges 11 and fastening the connecting parts, without the need for complex cutting or welding. Fastener 12 includes bolts, nuts and washers.
[0027] Please see Figure 2 and Figure 3 As a specific embodiment of the corrugated steel arch template provided by this utility model, the upper end of the circumferential flange 11 is provided with an outwardly extending protruding connecting part 15, and the protruding connecting part 15 is higher than the outer crest of the arched corrugated plate 10; the height difference between the upper end of the protruding connecting part 15 and the outer crest of the arched corrugated plate 10 is equal to the thickness of the arc plate 20; the arc plate 20 is fixedly connected to the protruding connecting part 15 and the crest of the arched corrugated plate 10; through the refined design of the structure of the circumferential flange 11, the integrity and forming quality of the corrugated steel arch template are further optimized. In this scheme, the protruding connecting part 15 on the circumferential flange 11 extends outward, and its height is precisely higher than the outer crest of the arched corrugated plate 10, and the height difference strictly matches the thickness of the arc plate 20, so that the arc plate 20 can form a seamless connection with the protruding connecting part 15 and the crest of the arched corrugated plate 10 when laid. The curved plate 20 is tightly integrated with the protruding connecting part 15 and the corrugated peak through double fixing. The protruding connecting part 15 fills the potential gaps at the splicing of adjacent corrugated plates, and the synergistic support of the corrugated peak and the protruding connecting part 15 enhances the stress stability of the curved plate 20. In this way, the surface of the curved plate 20 is ensured to be continuously flat, avoiding lining defects caused by uneven formwork joints during concrete pouring; the double fixing of the protruding connecting part 15 and the corrugated peak disperses the stress on the curved plate 20, reducing the risk of local deformation.
[0028] Please see Figure 3As a specific embodiment of the corrugated steel arch formwork provided by this utility model, a sealing gasket 13 is provided between the two circumferential flanges 11, and the upper end of the sealing gasket 13 is flush with the upper end of the circumferential flange 11. The sealing gasket 13 is embedded in the flange joint gap, which can effectively prevent grout leakage during concrete pouring and solve the problem of grout leakage caused by gaps at the joint. The design of the sealing gasket 13 being flush with the upper end of the flange ensures that the arc plate 20 and the flange connection part and the corrugated plate crest form a continuous and flat support surface 31. This not only enhances the sealing performance of the circumferential flange 11 connection through the sealing gasket 13, but also ensures the flatness of the concrete pouring surface after the arc plate 20 is installed.
[0029] Please see Figure 1 and Figure 2 As a specific embodiment of the corrugated steel arch formwork provided by this utility model, multiple supporting stiffeners 30 are divided into multiple groups and installed in multiple troughs of the arched corrugated plate 10 respectively; multiple supporting stiffeners 30 in the same group are arranged at intervals along the circumference of the arched corrugated plate 10; the group arrangement of multiple supporting stiffeners 30 further enhances the structural stability and load transfer efficiency of the corrugated steel arch formwork. Each group is precisely installed in different trough areas of the arched corrugated plate 10, and the supporting stiffeners 30 in the same group are evenly spaced along the circumference of the arched corrugated plate 10, and form a multi-point support network with the circumferential interval distribution, so that the loads such as surrounding rock pressure and concrete self-weight are efficiently transferred from the arc plate 20 to the main body of the arched corrugated plate 10 through the supporting stiffeners 30, avoiding the problem of local deformation caused by stress concentration in traditional support structures.
[0030] Please see Figure 1 , Figure 2 , Figure 4 As a specific embodiment of the corrugated steel arch formwork provided by this utility model, the supporting surface 31 is an arc surface adapted to the inner side of the arc plate 20; by designing the supporting surface 31 of the supporting stiffener 30 as an arc surface adapted to the inner side of the arc plate 20, the force transmission performance of the supporting structure is optimized. The arc surface design enables the supporting stiffener 30 to form a fully fitted surface contact with the inner side of the arc plate 20, rather than the traditional point or line contact, ensuring that the load is evenly transferred to the arched corrugated plate 10 through the contact area. This adaptable structure avoids local stress concentration caused by insufficient contact area and reduces the risk of deformation of the arc plate 20 due to uneven stress.
[0031] Please see Figure 4As a specific embodiment of the corrugated steel arch formwork provided by this utility model, the outer side of the supporting stiffener 30 is fixedly connected to the arched corrugated plate 10. A U-shaped reinforcing plate 32 is fixedly provided on the side of the supporting stiffener 30 away from the supporting surface 31. The outer side of the U-shaped reinforcing plate 32 has an arc-shaped surface that matches and connects with the trough of the arched corrugated plate 10. By adding the U-shaped reinforcing plate 32 to the supporting stiffener 30, the strength of the supporting structure is optimized, forming a multi-force protection system. After the outer side of the supporting stiffener 30 is fixed to the arched corrugated plate 10, the U-shaped reinforcing plate 32 is welded to the side away from the supporting surface 31. The bending resistance of the U-shaped structure is used to enhance the rigidity of the supporting stiffener 30 itself. The arc-shaped surface of the outer side of the U-shaped reinforcing plate 32 precisely matches the trough of the arched corrugated plate 10, so that the U-shaped reinforcing plate 32 is tightly attached to the inner wall of the trough. This design allows the supporting stiffener 30 to distribute the force to the entire trough area through the U-shaped reinforcing plate 32 when bearing the load transmitted by the arched plate 20, avoiding single-point overload. In this way, the U-shaped reinforcing plate 32 enhances the deformation resistance of the supporting stiffener 30, and the arc-shaped surface combined with the troughs ensures continuous and smooth force transmission, reducing structural damage caused by local stress concentration. At the same time, the U-shaped reinforcing plate 32 also increases the strength of the arched corrugated steel itself.
[0032] Please see Figure 4 As a specific embodiment of the corrugated steel arch formwork provided by this utility model, the U-shaped reinforcing plate 32 is provided with a plurality of reinforcing rods 33 for increasing bending strength. The reinforcing rods 33 are distributed transversely or longitudinally along the interior of the U-shaped reinforcing plate 32, forming a grid-like reinforcing system with the U-shaped reinforcing plate 32. The bending resistance characteristics of the reinforcing rods 33 are used to compensate for the bending weakness of the single U-shaped reinforcing plate 32, so that the reinforcing plate can distribute stress more evenly when bearing load. In this way, the reinforcing rods 33 and the U-shaped reinforcing plate 32 work together to enhance the overall rigidity and reduce the bending deformation of the supporting stiffener 30 due to heavy load.
[0033] Please see Figure 1 and Figure 5 As a specific embodiment of the corrugated steel arch template provided by this utility model, the corrugated steel arch template also includes several screws 40 for prefabrication and installation on the foundation base 50. The end of the arched corrugated plate 10 is provided with an end flange 14, which is connected to the foundation base 50 and the screws 40, and is fixedly connected by a locking member 41.
[0034] The connection stability between the template and the foundation is optimized through the combination design of prefabricated screws 40 and end flanges 14. Several screws 40 are prefabricated and installed on the foundation base 50 to ensure accurate positioning. The end flanges 14 at the ends of the arched corrugated plate 10 are connected to the foundation base 50 via screws 40 and then fixed with locking devices 41. During operation, the screws 40 are prefabricated and embedded first, then the end flanges 14 on the arched corrugated plate 10 are aligned with the screws 40 and inserted, and finally the locking devices 41 are tightened to complete the fixation. The prefabricated screws 40 avoid on-site drilling positioning errors and improve installation accuracy; the rigid connection between the end flanges 14 and the screws 40 enhances the overall pull-out resistance. The detachable design of the locking devices 41 makes template disassembly convenient. The locking devices 41 use nuts.
[0035] Please see Figure 1 and Figure 5 As a specific embodiment of the corrugated steel arch formwork provided by this utility model, the corrugated steel arch formwork also includes an inclined bearing surface 42 disposed on the upper end of the foundation base 50. The end of the inclined bearing surface 42 near the center of the arched corrugated plate 10 is higher than the end away from the center of the arched corrugated plate 10. The bolts 40 are arranged through the inclined bearing surface 42, and the end flanges 14 are butt-connected to the inclined bearing surface 42. The inclined bearing surface 42 adopts a slope design of "higher near the center and lower far from the center", so that the end flanges 14 of the arched corrugated plate 10 and the bearing surface form an inclined butt joint that fits snugly, and the bolts 40 that penetrate the inclined bearing surface 42 achieve rigid fixation. This inclined structure makes the load transfer path more in line with the mechanical principle, distributing the surrounding rock pressure and concrete self-weight borne by the arched corrugated plate 10 to the foundation base 50 along the inclined direction, avoiding the problem of local stress concentration caused by the sudden change of force flow in traditional planar connections. The inclined butt joint design reduces the shear stress on the connection surface of the end flanges 14 and reduces the risk of bolt loosening.
[0036] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A corrugated steel arch formwork, characterized in that, include: Arched corrugated plates are used for installation within the culvert area and above the culvert foundation base; The two ends of the arched corrugated plate are detachably connected to two base bases respectively; An arc-shaped plate is fitted onto the outer surface of the arched corrugated plate; the arc-shaped plate is fixedly connected to the arched corrugated plate. Multiple supporting stiffeners are fixedly installed in the outer troughs of the arched corrugated plate; each supporting stiffener has a supporting surface that connects to the arc-shaped plate. The number of arched corrugated plates is multiple, and they are arranged sequentially along the axial direction. Each arched corrugated plate has a circumferential flange on both sides. The circumferential flanges on two adjacent arched corrugated plates are mated together and fixedly connected with fasteners. The upper end of the circumferential flange has an outwardly extending protruding connecting part, and the protruding connecting part is higher than the outer crest of the arched corrugated plate. The height difference between the upper end of the protruding connecting part and the outer crest of the arched corrugated plate is equal to the thickness of the arc plate. The arc plate is fixedly connected to the protruding connecting part and the crest of the arched corrugated plate. The arc plate, the protruding connecting part, and the crest of the arched corrugated plate form a mating joint. The protruding connecting part fills the gap at the splicing point of adjacent corrugated plates and supports and strengthens the arc plate under stress. The outer side of the supporting stiffener is fixedly connected to the arched corrugated plate. A U-shaped reinforcing plate is fixed on the side of the supporting stiffener away from the supporting surface. The outer side of the U-shaped reinforcing plate has an arc-shaped surface that matches and connects with the trough of the arched corrugated plate. The strength of the supporting structure is optimized by adding a U-shaped reinforcing plate to the supporting stiffener. The force is distributed to the trough through the U-shaped reinforcing plate. Several reinforcing rods are provided inside the U-shaped reinforcing plate to increase the bending strength. The reinforcing rods are distributed laterally or longitudinally inside the U-shaped reinforcing plate, forming a grid-like reinforcing system with the U-shaped reinforcing plate. The bending resistance characteristics of the reinforcing rods are utilized. The reinforcing rods and the U-shaped reinforcing plate work together to enhance the overall rigidity and reduce the bending deformation of the supporting stiffener.
2. The corrugated steel arch formwork as described in claim 1, characterized in that, A sealing gasket is provided between the two circumferential flanges, and the upper end of the sealing gasket is flush with the upper end of the circumferential flange.
3. The corrugated steel arch formwork as described in claim 1, characterized in that, The multiple supporting stiffeners are divided into multiple groups and are respectively installed in multiple troughs of the arched corrugated plate; the multiple supporting stiffeners in the same group are arranged at intervals along the circumference of the arched corrugated plate.
4. The corrugated steel arch formwork as described in claim 1, characterized in that, The supporting surface is an arc surface that is adapted to the inner side of the arc plate.
5. The corrugated steel arch formwork as described in claim 1, characterized in that, The corrugated steel arch formwork also includes several screws for prefabrication and installation on the foundation base. The ends of the arched corrugated plate are provided with end flanges, which are mated to the foundation base and connected to the screws, and are fixedly connected using locking devices.
6. The corrugated steel arch formwork as described in claim 5, characterized in that, The corrugated steel arch formwork also includes an inclined bearing surface disposed on the upper end of the foundation base, wherein the end of the inclined bearing surface near the center of the arched corrugated plate is higher than the end away from the center of the arched corrugated plate; the screw is arranged through the inclined bearing surface, and the end flange is connected to the inclined bearing surface.