Steel plate stair concrete surface layer pouring formwork and using method thereof

Abstract

The invention discloses a steel plate stair concrete surface layer pouring formwork which comprises a side formwork arranged on the side edge of a steel plate stair, an end formwork covering the end of the steel plate stair and a step plate arranged above the stair, and the shape of the step plate is matched with that of a stair step of a steel plate. A gap for pouring concrete is reserved between the step plate and the steel plate staircase, and the step plate and the steel plate staircase are fixed through a plurality of opposite-pulling fixing devices; the opposite-pulling fixing device comprises an upper clamping plate, a lower clamping plate and an adjusting bolt, the upper clamping plate is arranged on the upper portion of the formwork, and the lower clamping plate is arranged on the lower portion of the steel stair; the adjusting bolt penetrates through the step plate and the steel plate stair from the upper portion of the upper clamping plate to the lower portion of the lower clamping plate and is in threaded connection with the step plate and the steel plate stair, and the distance between the step plate and the steel plate stair is adjusted by rotating the adjusting bolt. The distance between the step plate and the steel plate stair can be adjusted through the fixing assembly, then the concrete pouring thickness is adjusted, and the thickness of a concrete surface layer can be more conveniently controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of the construction of the concrete surface layer of a steel plate staircase, and particularly relates to a formwork tensioning and fixing device for pouring the concrete surface layer and a using method thereof. Background Art

[0002] A steel plate staircase is a staircase composed of steel plates. The steps of the steel plate staircase are formed by arranging diamond plates in a stepped manner. The steel plate staircase has advantages such as simple production and short construction period, but the steel plate staircase is not beautiful enough, is prone to deformation, and has a large noise.

[0003] In some projects, in order to reduce the noise of the steel plate staircase, prevent the steel structure from deforming during use, or to make the staircase more beautiful, a concrete surface layer with a certain thickness is poured on the upper surface of the diamond plate, and the concrete and the diamond plate are poured together. The concrete plays a role in reducing noise and enhancing the strength of the steel plate staircase.

[0004] However, due to the small thickness of the steps of the steel plate staircase and the easy deformation of the steel plate, when setting up the formwork before concrete pouring, ordinary nails are difficult to tightly fix the steel plate staircase and the formwork together. Under the conventional formwork fixing method, it is difficult to control the thickness of the concrete surface layer, and it is easy to produce different thicknesses at different parts of the staircase.

[0005] Therefore, how to control the position of the formwork, more conveniently unify the thickness of the concrete surface layer, and facilitate the subsequent concrete pouring is an urgent problem to be solved at present. Summary of the Invention

[0006] The purpose of the present application is to solve the problem that the thickness of the concrete surface layer is not easy to control when pouring the concrete surface layer of the steel plate staircase in the prior art. Therefore, the present invention provides a formwork for pouring the concrete surface layer of the steel plate staircase and a using method thereof, which can adjust the distance between the stepped plate and the steel plate staircase through the fixing component, and then adjust the thickness of the concrete pouring, and can more conveniently control the thickness of the concrete surface layer.

[0007] To achieve the above purpose, in the first aspect, the present invention provides a formwork for pouring the concrete surface layer of the steel plate staircase, including a side formwork arranged on the side of the steel plate staircase, an end formwork covering the end of the steel plate staircase, and a stepped plate arranged above the staircase. The shape of the stepped plate matches the shape of the staircase steps of the steel plate. A gap for pouring concrete is left between the stepped plate and the steel plate staircase. The stepped plate and the steel plate staircase are fixed by a plurality of tensioning and fixing devices; the stepped plate and the steel plate staircase, and at least the end of the steel plate staircase are fixed by the tensioning and fixing devices; an end formwork is arranged at the end of the steel plate staircase; the tensioning and fixing device at the end of the end formwork and the steel plate staircase are attached up and down to prevent slurry leakage.

[0008] In some embodiments, the tensioning and fixing device includes an upper clamping plate, a lower clamping plate and an adjusting bolt. The upper clamping plate is arranged on the upper part of the formwork, and the lower clamping plate is arranged on the lower part of the steel staircase.

[0009] The adjusting bolt penetrates through the stepped plate and the steel plate staircase from above the upper clamping plate to below the lower clamping plate, and the adjusting bolt is threadedly connected to the stepped plate and the steel plate staircase. The distance between the stepped plate and the steel plate staircase is adjusted by rotating the adjusting bolt.

[0010] With the above technical solution, a side formwork is arranged on the side of the steel plate staircase, a stepped plate is arranged above, and end formworks are arranged at the front and rear ends. Thus, a space for pouring concrete is formed on the upper surface of the steel plate staircase, and concrete is poured into the space. In this application, the distance between the stepped plate and the upper surface of the steel plate staircase can be simply adjusted through the fixing component, and then the thickness of the concrete surface layer can be adjusted. Moreover, the steel structure staircase can be clamped by the upper clamping plate and the lower clamping plate to prevent the steel structure staircase from warping under the pressure of the concrete.

[0011] In some embodiments, in the tensioning and fixing device at the end of the steel plate staircase, the upper clamping plate and the lower clamping plate protrude from the end of the steel plate staircase, and grooves are provided on the lower surface of the protruding position of the upper clamping plate and the upper surface of the protruding position of the lower clamping plate.

[0012] Both the upper and lower ends of the end formwork are provided with protrusions, and the protrusions are clamped between the upper clamping plate and the lower clamping plate.

[0013] With the above technical solution, the end formwork is fixed between the upper clamping plate and the lower clamping plate, realizing the fixation of the end formwork, and the fixing method is simple. It should be noted that due to the small thickness of the steel plate staircase, in the prior art, the end formwork is generally fixed on the side formwork, which results in a loose connection between the end formwork and the concrete staircase, and liquid leakage is likely to occur at the joint. In this application, the end formwork is first clamped between the upper clamping plate and the lower clamping plate, and then the upper clamping plate and the lower clamping plate are arranged on the stepped plate and the steel plate staircase, realizing the fixation of the end formwork.

[0014] In some embodiments, the end formwork and the upper clamping plate are fastened by screws. The screws penetrate into the upper clamping plate from the outside, horizontally penetrate through the groove and the protrusion, and the screws are threadedly connected to the protrusion and the upper clamping plate.

[0015] The screws are also symmetrically arranged between the lower clamping plate and the end formwork.

[0016] With the above technical solution, the end formwork can be more firmly clamped between the upper clamping plate and the lower clamping plate through the mortise and tenon structure and the screws.

[0017] In some embodiments, a pull plate is provided between the screw and the end template, the upper side of the pull plate covers the upper clamping plate, and the lower side covers the end template, and the screw passes through the upper side of the pull plate into the upper clamping plate;

[0018] A supporting bolt is provided on the lower side of the pull plate, and the supporting bolt is threadedly connected to the pull plate and supports the end template;

[0019] Pull plates and supporting bolts are also symmetrically arranged at the positions of the lower clamping plate and the screws.

[0020] By adopting the above technical solution, pressure is applied to the pull plate through the supporting bolts, and the pull plate then transfers the force to the screw, applying an outward force to the screw, increasing the friction between the screw and the end template, preventing the screw from loosening, and making the overall structure more stable.

[0021] In some embodiments, the pull plate completely covers the junction between the upper clamping plate and the end template, a plurality of the screws are provided on one pull plate, and the supporting bolt is provided at the center position of the upper side of the pull plate.

[0022] By adopting the above technical solution, the connection between the end formwork and the upper and lower clamping plates is tightened.

[0023] In some embodiments, the stepped plate is formed by multiple plates connected end to end.

[0024] By adopting the above technical solution, the step plate is made up of single plates connected end to end, making the entire step plate easier to customize and adjust according to site conditions, with a higher degree of freedom.

[0025] In some embodiments, at least one of the tensioning and fixing devices is provided on each step of the steel plate staircase.

[0026] Enhance the fixing strength of the entire step plate.

[0027] In some embodiments, the step plate, the upper clamping plate, and the lower clamping plate are all wooden formwork.

[0028] It is more convenient to obtain materials and fix them.

[0029] In some embodiments, a concrete pouring port is provided on the uppermost step of the stepped plate.

[0030] It is more convenient and more efficient to pour concrete from the top step of the step slab.

[0031] In a second aspect, the present application discloses a method for using a steel plate staircase concrete surface casting template, which comprises the following steps:

[0032] S1: Set the side formwork on the side of the steel plate staircase;

[0033] S2: Cut the formwork according to the design requirements and splice it into the said step plate

[0034] S3: Drill threaded holes in the said step plate and the steel plate staircase;

[0035] S4: Set the upper clamping plate and the lower clamping plate on the step plate and under the steel plate staircase respectively;

[0036] S5: Set the adjusting bolts in the said threaded holes, and the adjusting bolts are threadedly connected to the step plate and the steel plate staircase;

[0037] S6: Adjust the distance between the step plate and the steel plate staircase by rotating the adjusting bolts according to the design requirements;

[0038] S7: After the adjustment is completed, fix the step plate on the said side formwork;

[0039] S8: Set the end formwork between the step plate and the steel plate staircase to complete the assembly of the formwork.

[0040] In some embodiments, the setting of the end formwork includes the following steps:

[0041] S1: Cut out the said end formwork according to the design needs;

[0042] S2: Combine the upper clamping plate, the lower clamping plate and the end formwork, cover the pull plate at the joint, and fasten it with screws;

[0043] S3: Tighten the top support bolts;

[0044] S4: Set the upper clamping plate and the lower clamping plate provided with the end formwork at the end of the steel plate staircase;

[0045] S5: Set the upper clamping plate and the lower clamping plate on the step plate through the adjusting bolts to complete the setting of the end formwork.

[0046] Generally speaking, compared with the prior art, the beneficial effects of the present invention are as follows: The stepped plate is fixed above the steel plate staircase through the fixing component, and concrete is poured between the steel plate staircase and the stepped plate. Moreover, the distance between the stepped plate and the upper surface of the steel plate staircase can be adjusted through the adjusting bolts, thereby adjusting the thickness of the concrete surface layer. The adjustment is convenient and has high precision. On the other hand, on the side of the present application, the end template is fixed to the end of the steel plate staircase through the upper clamping plate and the lower clamping plate. Compared with the prior art method of directly fixing the wooden template to the side template with nails, the end template of this solution is fixed more firmly, and there is no gap between the steel plate staircase and the template, avoiding the phenomenon of slurry leakage. Moreover, clamping the steel structure staircase by the upper and lower clamping plates can prevent the occurrence of warping edges.

[0047] Other features and corresponding beneficial effects of the present application are described and explained in the following part of the specification, and it should be understood that at least some of the beneficial effects are obvious from the description in the specification of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, the present invention, its features, appearance and advantages will become more obvious. The same reference numerals indicate the same parts in all the drawings. The drawings are not drawn to scale, and the emphasis is on showing the gist of the present invention.

[0049] Figure 1 is a perspective view of the casting formwork for the concrete surface layer of the steel plate staircase according to the embodiment of the present invention;

[0050] Figure 2 is a front view of the casting formwork for the concrete surface layer of the steel plate staircase according to the embodiment of the present invention;

[0051] Figure 3 is a perspective view of the end of the casting formwork for the concrete surface layer of the steel plate staircase according to the embodiment of the present invention;

[0052] Figure 4 is Figure 2 a detailed view of position A in

[0053] Description of the reference numerals in the drawings:

[0054] 1, steel plate staircase; 2, side formwork; 3, end formwork; 4, stepped plate; 5, tensioning and fixing device; 51, upper clamping plate; 52, lower clamping plate; 53, adjusting bolt; 61, groove; 62, convex block; 63, screw; 64, pull plate; 65, top support bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0055] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0056] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0057] To make the purpose, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0058] Embodiment

[0059] Please refer to Figures 1-4 , this embodiment provides a casting formwork for the concrete surface layer of a steel plate staircase, which includes a side formwork 2 arranged on the side of the steel plate staircase 1, an end formwork 3 covering the end of the steel plate staircase 1, and a step plate 4 arranged above the staircase. The shape of the step plate 4 matches the shape of the staircase steps of the steel plate. A gap for pouring concrete is left between the step plate 4 and the steel plate staircase 1. The step plate 4 and the steel plate staircase 1, and at least the end of the steel plate staircase 1 are fixed by a tensioning fixing device 5; an end formwork 3 is arranged at the end of the steel plate staircase 1; the end formwork 3 and the tensioning fixing device 5 at the end of the steel plate staircase 1 are attached up and down to prevent leakage of slurry.

[0060] Specifically, the tensioning fixing device 5 includes an upper clamping plate 51, a lower clamping plate 52 and an adjusting bolt 53. The upper clamping plate 51 is arranged on the upper part of the formwork, and the lower clamping plate 52 is arranged on the lower part of the steel staircase; the adjusting bolt 53 penetrates through the step plate 4 and the steel plate staircase 1 from above the upper clamping plate 51 to below the lower clamping plate 52, and the adjusting bolt 53 is threadedly connected to the step plate 4 and the steel plate staircase 1. The distance between the step plate 4 and the steel plate staircase 1 is adjusted by rotating the adjusting bolt 53.

[0061] It should be noted in advance that in the prior art, when pouring the concrete on the upper surface of the steel plate staircase, how to support the formwork has always been a difficult problem to solve. During the formwork support process, it is necessary to ensure that the distance between the upper surface of the steel plate staircase 1 and the formwork above it is unified, and the distance between the two is the designed thickness of the concrete surface layer. On the other hand, it is necessary to ensure that the gap between the formwork and the steel plate staircase is small to prevent the cement slurry from flowing out along the gap, which affects the concrete strength. Especially at the end of the steel plate staircase 1, due to the large pressure, slurry leakage is likely to occur.

[0062] The way of formwork support in the prior art is as follows: support the side formwork on the side of the steel plate staircase, and support the upper formwork at a certain distance above the steel plate staircase, where the upper formwork is fixed to the side formwork. At the end of the steel plate staircase, both the upper formwork and the end formwork are fixed to the side formwork. In this way of formwork support, it is difficult to control the thickness of the concrete surface layer, and the end of the steel plate staircase is not tightly sealed, and the cement slurry is easy to flow out along the gap between the formworks.

[0063] However, this embodiment provides a new formwork. This formwork includes a step plate 4 on the side of the steel plate staircase 1. The step plate 4 and the steel plate staircase 1 are fixed by an upper clamping plate 51, a lower clamping plate 52 and an adjusting bolt 53, which not only realizes the fixation of the step plate 4, but also can more conveniently adjust the distance between the step plate 4 and the steel plate staircase 1.

[0064] Preferably, two adjusting bolts 53 are arranged between the upper clamping plate 51 and the lower clamping plate 52 to more stably fix the clamping plates through the two adjusting bolts 53.

[0065] Specifically, a tensioning and fixing device 5 is arranged at the end of the steel plate staircase 1. In the tensioning and fixing device 5 at the end, the upper clamping plate 51 and the lower clamping plate 52 protrude from the end of the steel plate staircase 1, and grooves 61 are arranged on the lower surface of the protruding position of the upper clamping plate 51 and the upper surface of the protruding position of the lower clamping plate 52; convex blocks 62 are arranged at both the upper and lower ends of the end formwork 3, and the convex blocks 62 are clamped between the upper clamping plate 51 and the lower clamping plate 52.

[0066] Specifically, the end formwork 3 and the upper clamping plate 51 are fastened by screws 63. The screws 63 penetrate from the outside of the upper clamping plate 51, horizontally penetrate through the grooves 61 and the convex blocks 62, and the screws 63 are threadedly connected to the convex blocks 62 and the upper clamping plate 51.

[0067] Specifically, a pull plate 64 is provided between the screw 63 and the end template 3. The upper side of the pull plate 64 covers the upper clamping plate 51, and the lower side covers the end template 3. The screw 63 penetrates into the upper clamping plate 51 from the upper side of the pull plate 64; a jacking bolt 65 is provided on the lower side of the pull plate 64. The jacking bolt 65 is threadedly connected to the pull plate 64 and jacks against the end template 3; screws 63 are also symmetrically provided between the lower clamping plate 52 and the end template 3, and pull plates 64 and jacking bolts 65 are also symmetrically provided at the positions of the lower clamping plate 52 and the screws 63.

[0068] Moreover, the pull plate 64 completely covers the junction of the upper clamping plate 51 and the end template 3. The width of the pull plate 64 is the same as the width of the entire upper clamping plate 51. The widths of the upper clamping plate 51 and the lower clamping plate 52 are equal to the width of the staircase. Two screws 63 are provided on one pull plate 64, and the jacking bolt 65 is provided at the central position on the upper side of the pull plate 64.

[0069] Specifically, both the end template 3 and the upper clamping plate 51 are wooden templates. After the end template 3 and the upper clamping plate 51 are spliced, the screw 63 can be directly screwed in without the need to drill threaded holes.

[0070] Compared with the prior art in which the end template 3 is directly fixed on the side template 2, in the embodiment of the present application, the end template 3 is first fixed on the upper clamping plate 51 and the lower clamping plate 52, and then the clamping plates are fixed on the steel plate staircase 1. In this fixing method, the connection between the end template 3 and the steel plate staircase 1 is closer, with almost no gaps, and it is not easy to have the phenomenon of mortar leakage. Moreover, through the fixing of the screws 63 and the adjusting bolts 53, it is also possible to prevent the template from shifting or deforming during the concrete pouring process.

[0071] Specifically, the stepped plate 4 is formed by end-to-end clamping of multiple plates.

[0072] At least one tensioning and fixing device 5 is provided on each steel plate staircase 1.

[0073] The stepped plate 4, the upper clamping plate 51, and the lower clamping plate 52 are all wooden templates.

[0074] A concrete pouring port is provided on the uppermost step of the stepped plate 4, and concrete is poured from the concrete pouring port.

[0075] Specifically, the thread direction on the stepped plate 4 is opposite to the thread direction on the steel plate staircase 1, so that the distance between the stepped plate 4 and the steel plate staircase 1 can be adjusted when the adjusting bolt 53 is rotated.

[0076] Specifically, the usage method of the concrete surface layer pouring formwork for the steel plate staircase 1 includes the following steps:

[0077] S1: Arrange the side formwork 2 on the side of the steel plate staircase 1;

[0078] S2: Cut the template according to the design requirements and splice it into the stepped plate 4;

[0079] S3: Drill threaded holes in the stepped plate 4 and the steel plate staircase 1;

[0080] S4: Dispose the upper clamping plate 51 and the lower clamping plate 52 on the stepped plate 4 and under the steel plate staircase 1 respectively;

[0081] S5: Set the adjusting bolt 53 in the threaded hole, and the adjusting bolt 53 is threadedly connected to the stepped plate 4 and the steel plate staircase 1;

[0082] S6: Adjust the distance between the stepped plate 4 and the steel plate staircase 1 by rotating the adjusting bolt 53 according to the design requirements;

[0083] S7: After the adjustment is completed, fix the stepped plate 4 on the side formwork 2;

[0084] S8: Cut out the end formwork 3 according to the design dimensions;

[0085] S9: Combine the upper clamping plate 51, the lower clamping plate 52 and the end formwork 3, cover the pull plate 64 at the joint, and fasten it with the screw 63;

[0086] S10: Tighten the top support bolt 65 to apply a certain stress to the screw 63;

[0087] S11: Dispose the upper clamping plate 51 and the lower clamping plate 52 provided with the end formwork 3 at the end of the steel plate staircase 1;

[0088] S12: Set the upper clamping plate 51 and the lower clamping plate 52 on the stepped plate 4 through the adjusting bolt 53 to complete the setting of the end formwork 3.

[0089] When all the formworks are spliced, pour concrete into the gap between the steel plate staircase 1 and the formwork. In some embodiments, the pouring port is located on the topmost step of the stepped plate 4, and the concrete is poured from above and gradually fills the entire gap along the steel plate staircase 1. After the concrete is poured, wait for the concrete to harden. When the concrete hardens, remove all the formworks and use cement mortar to fill the holes in the concrete.

[0090] Those skilled in the art should understand that those skilled in the art can achieve variations in combination with the prior art and the above embodiments, which will not be elaborated here. Such variations do not affect the essence of the present invention and will not be elaborated here.

[0091] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and the devices and structures not described in detail therein should be understood to be implemented in a common manner in the art; any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above, or modify it into an equivalent embodiment with equivalent changes, which does not affect the essence of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the protection of the technical solution of the present invention.

Claims

1. A formwork for casting the concrete surface layer of a steel plate staircase, characterized in that, It includes a side formwork (2) arranged on the side of the steel plate staircase (1), an end formwork (3) covering the end of the steel plate staircase (1), and a step plate (4) arranged above the steel plate staircase (1). The shape of the step plate (4) matches the shape of the steps of the steel plate staircase. A gap for pouring concrete is left between the step plate (4) and the steel plate staircase (1). The step plate (4) and the steel plate staircase (1) and at least the end of the steel plate staircase (1) are fixed by a tensioning fixing device (5); an end formwork (3) is arranged at the end of the steel plate staircase (1); the end formwork (3) and the tensioning fixing device (5) at the end of the steel plate staircase (1) are in up-and-down contact to prevent leakage of mortar.

2. The formwork for pouring the concrete surface layer of a steel plate staircase according to claim 1, wherein the tensioning fixing device (5) includes an upper clamping plate (51), a lower clamping plate (52) and an adjusting bolt (53). The upper clamping plate (51) is arranged at the upper part of the formwork, and the lower clamping plate (52) is arranged at the lower part of the steel staircase; the adjusting bolt (53) penetrates through the step plate (4) and the steel plate staircase (1) from above the upper clamping plate (51) to below the lower clamping plate (52), and the adjusting bolt (53) is threadedly connected to the step plate (4) and the steel plate staircase (1). The distance between the step plate (4) and the steel plate staircase (1) is adjusted by rotating the adjusting bolt (53).

3. The formwork for pouring the concrete surface layer of a steel plate staircase according to claim 2, wherein in the tensioning fixing device (5) at the end of the steel plate staircase (1), the upper clamping plate (51) and the lower clamping plate (52) protrude from the end of the steel plate staircase (1), and grooves (61) are provided on the lower surface of the protruding position of the upper clamping plate (51) and the upper surface of the protruding position of the lower clamping plate (52); protrusions (62) are provided at both the upper and lower ends of the end formwork (3), and the end formwork (3) is clamped between the upper clamping plate (51) and the lower clamping plate (52) through the protrusions (62); the end formwork (3) and the upper clamping plate (51) are fastened by screws (63). The screws (63) penetrate into the upper clamping plate (51) from the outside of the upper clamping plate (51), horizontally penetrate through the grooves (61) and the protrusions (62), and the screws (63) are threadedly connected to the protrusions (62) and the upper clamping plate (51); symmetrically arranged screws (63) are also provided between the lower clamping plate (52) and the end formwork (3).

4. The formwork for pouring the concrete surface layer of a steel plate staircase according to claim 3, wherein a pull plate (64) is arranged between the screw (63) and the end formwork (3). The upper side of the pull plate (64) covers the upper clamping plate (51), and the lower side covers the end formwork (3). The screw (63) penetrates into the upper clamping plate (51) from the upper side of the pull plate (64); A jacking bolt (65) is arranged on the lower side of the drawplate (64). The jacking bolt (65) is in threaded connection with the drawplate (64) and jacks up the end template (3). The drawplate (64) and the jacking bolt (65) are also symmetrically arranged at the positions of the lower clamping plate (52) and the screw (63).

5. A formwork for casting the concrete surface layer of a steel plate staircase according to claim 4, characterized in that The drawplate (64) completely covers the junction of the upper clamping plate (51) and the end template (3). A plurality of screws (63) are arranged on one drawplate (64), and the jacking bolt (65) is arranged at the central position on the upper side of the drawplate (64).

6. A formwork for casting the concrete surface layer of a steel plate staircase according to claim 1, characterized in that The stepped plate (4) is formed by clamping the heads and tails of multiple plates.

7. A formwork for casting the concrete surface layer of a steel plate staircase according to claim 1, characterized in that At least one tensioning and fixing device (5) is arranged on each steel plate staircase (1).

8. A formwork for casting the concrete surface layer of a steel plate staircase according to claim 1, characterized in that A concrete pouring port is opened on the uppermost step of the stepped plate (4).

9. A method for using a formwork for casting a concrete surface layer of a steel plate staircase, characterized in that, Using a formwork for casting the concrete surface layer of a steel plate staircase according to any one of claims 1-8, comprising the following steps: S1: Arrange the side formwork (2) on the side of the steel plate staircase (1); S2: Cut the formwork according to the design requirements and splice it into the stepped plate (4); S3: Open threaded holes on the stepped plate (4) and the steel plate staircase (1); S4: Respectively arrange the upper clamping plate (51) and the lower clamping plate (52) on the stepped plate (4) and under the steel plate staircase (1); S5: Arrange the adjusting bolt (53) in the threaded hole. The adjusting bolt (53) is in threaded connection with the stepped plate (4) and the steel plate staircase (1); S6: Adjust the distance between the stepped plate (4) and the steel plate staircase (1) by rotating the adjusting bolt (53) according to the design requirements; S7: After the adjustment is completed, fix the stepped plate (4) on the side formwork (2); S8: Arrange the end formwork (3) between the stepped plate (4) and the steel plate staircase (1) to complete the assembly of the formwork.

10. The method of using a formwork for casting a concrete surface layer of a steel plate staircase according to claim 9, characterized in that, The setting of the end formwork (3) includes the following steps: S1: Cut out the end formwork (3) according to the design requirements; S2: Combine the upper clamping plate (51), the lower clamping plate (52) and the end formwork (3), cover the drawplate (64) at the junction, and fasten it with the screw (63); S3: Tighten the jacking bolt (65); S4: Arrange the upper clamping plate (51) and the lower clamping plate (52) provided with the end formwork (3) at the end of the steel plate staircase (1); S5: Arrange the upper clamping plate (51) and the lower clamping plate (52) on the stepped plate (4) through the adjusting bolt (53) to complete the setting of the end formwork (3).

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